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Home Return to list Winter Storm Warning 0016 Issued by the Riverton Forecast Office
Action: New Issued At: 2025-12-20 13:17:51 163 WWUS45 KRIW 201917 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1217 PM MST Sat Dec 20 2025 WYZ001-002-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 10 to 20 inches. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Teton and Gros Ventre Mountains- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations between 18 and 30 inches. Winds gusting as high as 50 mph. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Wind River Mountains West-Wind River Mountains East- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches. Winds gusting as high as 70 mph. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. Hazardous conditions could impact travel along South Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Salt River and Wyoming Ranges- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 18 inches. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, including over Satl River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: New Issued At: 2025-12-20 13:17:51 163 WWUS45 KRIW 201917 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1217 PM MST Sat Dec 20 2025 WYZ001-002-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 10 to 20 inches. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Teton and Gros Ventre Mountains- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations between 18 and 30 inches. Winds gusting as high as 50 mph. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Wind River Mountains West-Wind River Mountains East- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches. Winds gusting as high as 70 mph. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. Hazardous conditions could impact travel along South Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Salt River and Wyoming Ranges- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 18 inches. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, including over Satl River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: New Issued At: 2025-12-20 13:17:51 163 WWUS45 KRIW 201917 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1217 PM MST Sat Dec 20 2025 WYZ001-002-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 10 to 20 inches. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Teton and Gros Ventre Mountains- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations between 18 and 30 inches. Winds gusting as high as 50 mph. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Wind River Mountains West-Wind River Mountains East- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches. Winds gusting as high as 70 mph. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. Hazardous conditions could impact travel along South Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Salt River and Wyoming Ranges- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 18 inches. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, including over Satl River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: New Issued At: 2025-12-20 13:17:51 163 WWUS45 KRIW 201917 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1217 PM MST Sat Dec 20 2025 WYZ001-002-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 10 to 20 inches. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Teton and Gros Ventre Mountains- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations between 18 and 30 inches. Winds gusting as high as 50 mph. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Wind River Mountains West-Wind River Mountains East- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches. Winds gusting as high as 70 mph. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult. Hazardous conditions could impact travel along South Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-211215- /O.NEW.KRIW.WS.W.0016.251221T0600Z-251222T1200Z/ Salt River and Wyoming Ranges- 1217 PM MST Sat Dec 20 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM MST MONDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 18 inches. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 PM this evening to 5 AM MST Monday. * IMPACTS...Travel could be very difficult, including over Satl River Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: Time Extended Issued At: 2025-12-21 02:35:46 921 WWUS45 KRIW 210835 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 135 AM MST Sun Dec 21 2025 WYZ001-002-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Lake, and Old Faithful 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Time Extended Issued At: 2025-12-21 02:35:46 921 WWUS45 KRIW 210835 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 135 AM MST Sun Dec 21 2025 WYZ001-002-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Lake, and Old Faithful 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Time Extended Issued At: 2025-12-21 02:35:46 921 WWUS45 KRIW 210835 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 135 AM MST Sun Dec 21 2025 WYZ001-002-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Lake, and Old Faithful 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Time Extended Issued At: 2025-12-21 02:35:46 921 WWUS45 KRIW 210835 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 135 AM MST Sun Dec 21 2025 WYZ001-002-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Lake, and Old Faithful 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-212300- /O.EXT.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 135 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-21 10:13:33 944 WWUS45 KRIW 211613 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 913 AM MST Sun Dec 21 2025 WYZ001-002-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Old Faithful, Lake, and Mammoth 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: Continued Issued At: 2025-12-21 10:13:33 944 WWUS45 KRIW 211613 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 913 AM MST Sun Dec 21 2025 WYZ001-002-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Old Faithful, Lake, and Mammoth 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: Continued Issued At: 2025-12-21 10:13:33 944 WWUS45 KRIW 211613 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 913 AM MST Sun Dec 21 2025 WYZ001-002-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Old Faithful, Lake, and Mammoth 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: Continued Issued At: 2025-12-21 10:13:33 944 WWUS45 KRIW 211613 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 913 AM MST Sun Dec 21 2025 WYZ001-002-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Old Faithful, Lake, and Mammoth 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 3 to 6 inches for areas in Yellowstone above 7000ft, mainly through Sunday morning; accumulations of 18 to 30 inches above 8000ft. Snow levels will be rising to 8000ft late Sunday afternoon into Sunday night. Winds gusts of 40 to 50 mph by Sunday afternoon. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Locally higher amounts over 40 inches possible. Wind gusts of 35 to 50 mph starting by 12pm Sunday, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult, especially across Teton and Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon Sunday afternoon into the evening. * WHERE...Wind River Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-220700- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 913 AM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations of 12 to 24 inches above 8000ft. Winds gusts of 35 to 50 mph starting by 12pm Sunday. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Sunday evening, Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Straub Action: Continued Issued At: 2025-12-21 23:24:26 215 WWUS45 KRIW 220524 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1024 PM MST Sun Dec 21 2025 WYZ001-002-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations 15 to 30 inches for areas above 8000ft. Winds gusts of 35 to 45 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Wind gusts of 35 to 50 mph, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting over 70 mph over South Pass/Red Canyon. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations up to 12 inches. Winds gusting as high as 45 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-21 23:24:26 215 WWUS45 KRIW 220524 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1024 PM MST Sun Dec 21 2025 WYZ001-002-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations 15 to 30 inches for areas above 8000ft. Winds gusts of 35 to 45 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Wind gusts of 35 to 50 mph, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting over 70 mph over South Pass/Red Canyon. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations up to 12 inches. Winds gusting as high as 45 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-21 23:24:26 215 WWUS45 KRIW 220524 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1024 PM MST Sun Dec 21 2025 WYZ001-002-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations 15 to 30 inches for areas above 8000ft. Winds gusts of 35 to 45 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Wind gusts of 35 to 50 mph, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting over 70 mph over South Pass/Red Canyon. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations up to 12 inches. Winds gusting as high as 45 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-21 23:24:26 215 WWUS45 KRIW 220524 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1024 PM MST Sun Dec 21 2025 WYZ001-002-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations 15 to 30 inches for areas above 8000ft. Winds gusts of 35 to 45 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations between 20 and 36 inches. Wind gusts of 35 to 50 mph, leading to blowing snow. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST Monday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Snow accumulations of 20 to 40 inches above 8500 feet. Snow accumulations for South Pass and Red Canyon will range from 2 to 5 inches. Winds gusting over 70 mph over South Pass/Red Canyon. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-222100- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1024 PM MST Sun Dec 21 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Heavy snow. Additional snow accumulations up to 12 inches. Winds gusting as high as 45 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-22 01:16:29 358 WWUS45 KRIW 220716 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1216 AM MST Mon Dec 22 2025 WYZ001-002-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations 4 to 8 inches. Locally higher amounts up to 15 inches. Winds gusting 35 to 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 6 to 8 inches. Locally higher amounts up to 15 inches on the Tetons and Gros Ventres. Winds gusting 35 to 45 mph, decreasing through the afternoon. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 4 to 8 inches. Locally higher amounts up to 16 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon through 2PM. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations up to 8 inches. Winds gusting as high as 45 mph, decreasing through the afternoon. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-22 01:16:29 358 WWUS45 KRIW 220716 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1216 AM MST Mon Dec 22 2025 WYZ001-002-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations 4 to 8 inches. Locally higher amounts up to 15 inches. Winds gusting 35 to 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 6 to 8 inches. Locally higher amounts up to 15 inches on the Tetons and Gros Ventres. Winds gusting 35 to 45 mph, decreasing through the afternoon. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 4 to 8 inches. Locally higher amounts up to 16 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon through 2PM. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations up to 8 inches. Winds gusting as high as 45 mph, decreasing through the afternoon. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-22 01:16:29 358 WWUS45 KRIW 220716 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1216 AM MST Mon Dec 22 2025 WYZ001-002-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations 4 to 8 inches. Locally higher amounts up to 15 inches. Winds gusting 35 to 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 6 to 8 inches. Locally higher amounts up to 15 inches on the Tetons and Gros Ventres. Winds gusting 35 to 45 mph, decreasing through the afternoon. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 4 to 8 inches. Locally higher amounts up to 16 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon through 2PM. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations up to 8 inches. Winds gusting as high as 45 mph, decreasing through the afternoon. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-22 01:16:29 358 WWUS45 KRIW 220716 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1216 AM MST Mon Dec 22 2025 WYZ001-002-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations 4 to 8 inches. Locally higher amounts up to 15 inches. Winds gusting 35 to 55 mph. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Teton and Gros Ventre Mountains- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 6 to 8 inches. Locally higher amounts up to 15 inches on the Tetons and Gros Ventres. Winds gusting 35 to 45 mph, decreasing through the afternoon. * WHERE...Teton and Gros Ventre Mountains. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ WYZ014-015-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Wind River Mountains West-Wind River Mountains East- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 4 to 8 inches. Locally higher amounts up to 16 inches. Winds gusting as high as 70 mph over South Pass/Red Canyon through 2PM. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-230000- /O.CON.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Salt River and Wyoming Ranges- 1216 AM MST Mon Dec 22 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations up to 8 inches. Winds gusting as high as 45 mph, decreasing through the afternoon. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Monday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Expired Issued At: 2025-12-22 17:37:27 555 WWUS45 KRIW 222337 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 437 PM MST Mon Dec 22 2025 WYZ001-002-012-014-015-024-230045- /O.EXP.KRIW.WS.W.0016.000000T0000Z-251223T0000Z/ Yellowstone National Park-Absaroka Mountains-Teton and Gros Ventre Mountains-Wind River Mountains West-Wind River Mountains East-Salt River and Wyoming Ranges- Including the cities of Lake, Old Faithful, and Mammoth 437 PM MST Mon Dec 22 2025 ...WINTER STORM WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON... The threat has ended. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Lowe | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||