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Home Return to list Fire Weather Warning 0031 Issued by the Denver / Boulder Forecast Office
Action: New Issued At: 2025-12-18 15:44:53 497 WWUS85 KBOU 182144 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 244 PM MST Thu Dec 18 2025 ...CRITICAL FIRE WEATHER CONDITIONS FRIDAY... Critical fire weather conditions over the northeast plains will gradually ease into this evening. Strong winds will redevelop in the foothills overnight, with high winds spreading slowly east across the nearby adjacent plains west of I-25 through the afternoon. Extremely high wind gusts of 85-100 mph combined with humidities dropping into the 10-20 percent range will create potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Northeast Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 242. * TIMING...For the first Red Flag Warning, until 5 PM MST this afternoon. For the second Red Flag Warning, from 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ215-216-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 5 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts of 80-100 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238>241-243-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 20 to 35 mph, with gusts up to 80 mph or more immediately next to the foothills. Gusts closer to 40 mph along and east of I-25. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190000- /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO.. * AFFECTED AREA...Fire Weather Zones 244, 248, 249, 250 and 251. * TIMING...Until 5 PM MST this afternoon. * WINDS...North 20 to 30 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ245>247-190545- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 244 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: New Issued At: 2025-12-18 15:44:53 497 WWUS85 KBOU 182144 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 244 PM MST Thu Dec 18 2025 ...CRITICAL FIRE WEATHER CONDITIONS FRIDAY... Critical fire weather conditions over the northeast plains will gradually ease into this evening. Strong winds will redevelop in the foothills overnight, with high winds spreading slowly east across the nearby adjacent plains west of I-25 through the afternoon. Extremely high wind gusts of 85-100 mph combined with humidities dropping into the 10-20 percent range will create potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Northeast Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 242. * TIMING...For the first Red Flag Warning, until 5 PM MST this afternoon. For the second Red Flag Warning, from 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ215-216-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 5 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts of 80-100 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238>241-243-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 20 to 35 mph, with gusts up to 80 mph or more immediately next to the foothills. Gusts closer to 40 mph along and east of I-25. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190000- /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO.. * AFFECTED AREA...Fire Weather Zones 244, 248, 249, 250 and 251. * TIMING...Until 5 PM MST this afternoon. * WINDS...North 20 to 30 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ245>247-190545- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 244 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: New Issued At: 2025-12-18 15:44:53 497 WWUS85 KBOU 182144 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 244 PM MST Thu Dec 18 2025 ...CRITICAL FIRE WEATHER CONDITIONS FRIDAY... Critical fire weather conditions over the northeast plains will gradually ease into this evening. Strong winds will redevelop in the foothills overnight, with high winds spreading slowly east across the nearby adjacent plains west of I-25 through the afternoon. Extremely high wind gusts of 85-100 mph combined with humidities dropping into the 10-20 percent range will create potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Northeast Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 242. * TIMING...For the first Red Flag Warning, until 5 PM MST this afternoon. For the second Red Flag Warning, from 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ215-216-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 5 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts of 80-100 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238>241-243-190545- /O.UPG.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ /O.NEW.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to midnight MST Friday night. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zones 238, 239, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 20 to 35 mph, with gusts up to 80 mph or more immediately next to the foothills. Gusts closer to 40 mph along and east of I-25. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190000- /O.CON.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 244 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO.. * AFFECTED AREA...Fire Weather Zones 244, 248, 249, 250 and 251. * TIMING...Until 5 PM MST this afternoon. * WINDS...North 20 to 30 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ245>247-190545- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 244 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 18:09:27 466 WWUS85 KBOU 190008 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 508 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85-105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-191300- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Northeast Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING TODAY HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 242. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190115- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... Winds have decreased sufficiently to allow the Red Flag Warning to expire. $$ COZ215-216-191300- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240-241-243-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I-25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR ABOVE 5500 FEET IMMEDIATELY ADJACENT TO THE FOOTHILLS OF BOULDER AND JEFFERSON COUNTIES... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191300- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 508 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 18:09:27 466 WWUS85 KBOU 190008 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 508 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85-105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-191300- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Northeast Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING TODAY HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 242. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190115- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... Winds have decreased sufficiently to allow the Red Flag Warning to expire. $$ COZ215-216-191300- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240-241-243-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I-25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR ABOVE 5500 FEET IMMEDIATELY ADJACENT TO THE FOOTHILLS OF BOULDER AND JEFFERSON COUNTIES... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191300- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 508 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 18:09:27 466 WWUS85 KBOU 190008 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 508 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85-105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-191300- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Northeast Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING TODAY HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 242. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190115- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... Winds have decreased sufficiently to allow the Red Flag Warning to expire. $$ COZ215-216-191300- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240-241-243-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I-25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR ABOVE 5500 FEET IMMEDIATELY ADJACENT TO THE FOOTHILLS OF BOULDER AND JEFFERSON COUNTIES... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191300- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 508 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 18:09:27 466 WWUS85 KBOU 190008 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 508 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85-105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25-40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ242-191300- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Northeast Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTHERN WELD COUNTY... ...RED FLAG WARNING TODAY HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 242. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ244-248>251-190115- /O.EXP.KBOU.FW.W.0030.000000T0000Z-251219T0000Z/ Morgan County-Logan County-Washington County-Sedgwick County- Phillips County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHEAST PLAINS OF COLORADO... Winds have decreased sufficiently to allow the Red Flag Warning to expire. $$ COZ215-216-191300- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240-241-243-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and South Weld County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I-25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191300- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 508 PM MST Thu Dec 18 2025 ...RED FLAG WARNING FOR A PARTICULARLY DANGEROUS SITUATION REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR ABOVE 5500 FEET IMMEDIATELY ADJACENT TO THE FOOTHILLS OF BOULDER AND JEFFERSON COUNTIES... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191300- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 508 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 21:51:33 186 WWUS85 KBOU 190351 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 851 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ215-216-191200- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191200- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 851 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 21:51:33 186 WWUS85 KBOU 190351 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 851 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ215-216-191200- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191200- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 851 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-18 21:51:33 186 WWUS85 KBOU 190351 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 851 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Areas farther east into eastern Adams, Arapahoe, Elbert, and Lincoln counties have more uncertainty if those winds even develop, so those locations remain under a Fire Weather Watch. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ215-216-191200- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM Friday to midnight MST Friday night. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-191200- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 851 PM MST Thu Dec 18 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM FRIDAY TO MIDNIGHT MST FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM Friday to midnight MST Friday night. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ245>247-191200- /O.CON.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 851 PM MST Thu Dec 18 2025 ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... * AFFECTED AREA...Fire Weather Zones 245, 246 and 247. * TIMING...From Friday morning through Friday evening. * WINDS...Southwest 10 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ Action: Continued Issued At: 2025-12-19 02:58:20 577 WWUS85 KBOU 190858 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 158 AM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Larimer, Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ245>247-191000- /O.CAN.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 158 AM MST Fri Dec 19 2025 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... The National Weather Service in Denver has cancelled the Fire Weather Watch. Low relataive humidity is expected through 6 PM, but winds are not expected to be strong enough for long enough to warrant a red flag warning while relative humidity values are below 20 percent. $$ COZ215-216-200000- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM EARLY THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM early this morning to midnight MST tonight. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 02:58:20 577 WWUS85 KBOU 190858 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 158 AM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Larimer, Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ245>247-191000- /O.CAN.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 158 AM MST Fri Dec 19 2025 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... The National Weather Service in Denver has cancelled the Fire Weather Watch. Low relataive humidity is expected through 6 PM, but winds are not expected to be strong enough for long enough to warrant a red flag warning while relative humidity values are below 20 percent. $$ COZ215-216-200000- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM EARLY THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM early this morning to midnight MST tonight. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 02:58:20 577 WWUS85 KBOU 190858 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 158 AM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85- 105 mph, are expected in the foothills of Larimer, Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires, should any new starts occur. Winds toward I-25 and eastward will be slower to develop, and also speeds will be considerably lighter. That said, gusts of 25- 40 mph are still expected to combine with very low humidity and cured grasses to support critical fire weather conditions. Such conditions may be a longer duration than usual, with potential for low humidity to extend well into the evening hours. COZ245>247-191000- /O.CAN.KBOU.FW.A.0017.251219T1700Z-251220T0700Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 158 AM MST Fri Dec 19 2025 ...FIRE WEATHER WATCH IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR PORTIONS OF EAST CENTRAL COLORADO EAST OF DENVER TOWARD LIMON... The National Weather Service in Denver has cancelled the Fire Weather Watch. Low relataive humidity is expected through 6 PM, but winds are not expected to be strong enough for long enough to warrant a red flag warning while relative humidity values are below 20 percent. $$ COZ215-216-200000- /O.CON.KBOU.FW.W.0031.251219T1200Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 5 AM EARLY THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...From 5 AM early this morning to midnight MST tonight. * WINDS...West 35 to 50 mph with gusts up to 85-105 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for extremely rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 60 mph possible west of I-25, and gusts to 40 mph possible along and east of I- 25. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200000- /O.CON.KBOU.FW.W.0031.251219T1700Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 158 AM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...From 10 AM this morning to midnight MST tonight. * WINDS...West 30 to 40 mph with gusts up to 80 mph or more immediately next to the foothills. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 16:57:27 959 WWUS85 KBOU 192257 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 357 PM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds of 30-40 mph with gusts as high as 85 mph in the foothills of Boulder and northern Jefferson Counties will continue until early evening. Relative humidity values had dropped into the upper single digits and lower teens. Thus, the Particularly Dangerous Situation will remain in place til around 5-6 pm, with only a slow improvement thereafter as winds slowly weaken. Red Flag conditions, however, will persist through the rest of the evening as we remain in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. While most of the Denver metro area has seen lighter winds prevail most of the day, a period of strong, gusty winds is expected to develop this evening and likely last past midnight, producing Red Flag conditions there. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 40 mph with gusts up to 85 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 65 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 16:57:27 959 WWUS85 KBOU 192257 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 357 PM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds of 30-40 mph with gusts as high as 85 mph in the foothills of Boulder and northern Jefferson Counties will continue until early evening. Relative humidity values had dropped into the upper single digits and lower teens. Thus, the Particularly Dangerous Situation will remain in place til around 5-6 pm, with only a slow improvement thereafter as winds slowly weaken. Red Flag conditions, however, will persist through the rest of the evening as we remain in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. While most of the Denver metro area has seen lighter winds prevail most of the day, a period of strong, gusty winds is expected to develop this evening and likely last past midnight, producing Red Flag conditions there. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 40 mph with gusts up to 85 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 65 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 16:57:27 959 WWUS85 KBOU 192257 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 357 PM MST Fri Dec 19 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds of 30-40 mph with gusts as high as 85 mph in the foothills of Boulder and northern Jefferson Counties will continue until early evening. Relative humidity values had dropped into the upper single digits and lower teens. Thus, the Particularly Dangerous Situation will remain in place til around 5-6 pm, with only a slow improvement thereafter as winds slowly weaken. Red Flag conditions, however, will persist through the rest of the evening as we remain in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. While most of the Denver metro area has seen lighter winds prevail most of the day, a period of strong, gusty winds is expected to develop this evening and likely last past midnight, producing Red Flag conditions there. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR THE FRONT RANGE FOOTHILLS. * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 40 mph with gusts up to 85 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 357 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * THIS IS A PARTICULARLY DANGEROUS SITUATION FOR LOCATIONS ABOVE 5,500 FEET IMMEDIATELY ADJACENT TO THE BOULDER AND NORTHERN JEFFERSON COUNTY FOOTHILLS. * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 65 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a fast moving wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... This is a Particularly Dangerous Situation that poses a significant threat to life and property in the event of a wildfire start. Residents are urged to assemble an emergency supply kit and know their evacuation routes. In some cases, safe and timely evacuation may not be possible should a fire approach. Have multiple ways to receive instructions from emergency services, and evacuate if ordered to or if a fire threatens. && $$ Action: Continued Issued At: 2025-12-19 21:08:34 344 WWUS85 KBOU 200308 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT... West west winds of 20-35 mph with gusts as high as 60 mph in wind prone areas near the base of the foothills will continue into this evening. They will also be spreading east onto the nearby adjacent plains and I-25 Corridor through late evening and overnight. While the Particularly Dangerous Situation for the foothills of Boulder and northern Jefferson Counties has eased, Red Flag conditions will remain in place as we stay in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph west of I-25. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 60 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ Action: Continued Issued At: 2025-12-19 21:08:34 344 WWUS85 KBOU 200308 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT... West west winds of 20-35 mph with gusts as high as 60 mph in wind prone areas near the base of the foothills will continue into this evening. They will also be spreading east onto the nearby adjacent plains and I-25 Corridor through late evening and overnight. While the Particularly Dangerous Situation for the foothills of Boulder and northern Jefferson Counties has eased, Red Flag conditions will remain in place as we stay in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph west of I-25. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 60 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ Action: Continued Issued At: 2025-12-19 21:08:34 344 WWUS85 KBOU 200308 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT... West west winds of 20-35 mph with gusts as high as 60 mph in wind prone areas near the base of the foothills will continue into this evening. They will also be spreading east onto the nearby adjacent plains and I-25 Corridor through late evening and overnight. While the Particularly Dangerous Situation for the foothills of Boulder and northern Jefferson Counties has eased, Red Flag conditions will remain in place as we stay in a near record warm, dry, and windy airmass along the Front Range through midnight. In fact, strong, gusty winds will persist through much of the night with only a slow improvement in humidity values. Thus, near critical Red Flag conditions will occur into early Saturday morning. COZ215-216-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS... * AFFECTED AREA...Fire Weather Zones 215 and 216. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ238-240>243-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer County Below 6000 Feet/Northwest Weld County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE I-25 URBAN CORRIDOR... * AFFECTED AREA...Fire Weather Zones 238, 240, 241, 242 and 243. * TIMING...Until midnight MST tonight. * WINDS...West 15 to 25 mph with gusts up to 50 mph west of I-25. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-200700- /O.CON.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- 808 PM MST Fri Dec 19 2025 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY... * AFFECTED AREA...Fire Weather Zone 239. * TIMING...Until midnight MST tonight. * WINDS...West 25 to 35 mph with gusts up to 60 mph. * RELATIVE HUMIDITY...As low as 14 percent. * IMPACTS...Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ Action: Expired Issued At: 2025-12-20 01:06:40 232 WWUS85 KBOU 200706 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1206 AM MST Sat Dec 20 2025 COZ215-216-238>243-200815- /O.EXP.KBOU.FW.W.0031.000000T0000Z-251220T0700Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County- 1206 AM MST Sat Dec 20 2025 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS AND FRONT RANGE I-25 CORRIDOR.. $$ | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||