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Home Return to list Winter Weather Advisory 0038 Issued by the Riverton Forecast Office
Action: New Issued At: 2025-12-18 02:25:07 716 WWUS45 KRIW 180824 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 124 AM MST Thu Dec 18 2025 WYZ001-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Yellowstone National Park- Including the cities of Lake, Mammoth, and Old Faithful 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations between 10 and 20 inches, with the highest amounts of 2 to 3 feet in southwestern Yellowstone. Lower elevations of northern and western Yellowstone will see 4 to 10 inches of snow with much lower amounts, less than 4 inches at Mammoth. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult especially in the backcountry. 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 . && $$ WYZ002-012-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Total snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet with localized areas greater than 3 feet. Winds gusting as high as 55 mph at times. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 10 to 20 inches with amounts of 2 to 3 feet in the highest elevations. 4 to 8 inches of snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Salt River and Wyoming Ranges- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 8 to 16 inches with amounts of 18 to 24 inches in the highest elevations. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-190030- /O.NEW.KRIW.WW.Y.0038.251218T1800Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Star Valley Ranch, Alpine, Jackson, Afton, and Thayne 124 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches with locally higher amounts of 10 to 14 inches in the higher elevations and along the foothills. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-190030- /O.NEW.KRIW.WW.Y.0038.251218T1800Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 124 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches around Pinedale and Daniel with higher amounts of 6 to 10 inches nearby Bondurant. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: New Issued At: 2025-12-18 02:25:07 716 WWUS45 KRIW 180824 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 124 AM MST Thu Dec 18 2025 WYZ001-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Yellowstone National Park- Including the cities of Lake, Mammoth, and Old Faithful 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations between 10 and 20 inches, with the highest amounts of 2 to 3 feet in southwestern Yellowstone. Lower elevations of northern and western Yellowstone will see 4 to 10 inches of snow with much lower amounts, less than 4 inches at Mammoth. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult especially in the backcountry. 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 . && $$ WYZ002-012-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Total snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet with localized areas greater than 3 feet. Winds gusting as high as 55 mph at times. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 10 to 20 inches with amounts of 2 to 3 feet in the highest elevations. 4 to 8 inches of snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-190030- /O.NEW.KRIW.WS.W.0015.251218T1800Z-251220T1200Z/ Salt River and Wyoming Ranges- 124 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 8 to 16 inches with amounts of 18 to 24 inches in the highest elevations. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-190030- /O.NEW.KRIW.WW.Y.0038.251218T1800Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Star Valley Ranch, Alpine, Jackson, Afton, and Thayne 124 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches with locally higher amounts of 10 to 14 inches in the higher elevations and along the foothills. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-190030- /O.NEW.KRIW.WW.Y.0038.251218T1800Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 124 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches around Pinedale and Daniel with higher amounts of 6 to 10 inches nearby Bondurant. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Continued Issued At: 2025-12-18 12:40:49 231 WWUS45 KRIW 181840 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1140 AM MST Thu Dec 18 2025 WYZ001-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Mammoth, Old Faithful, and Lake 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations between 8 and 15 inches, with higher amounts of 2 to 3 feet in southern Yellowstone. Total snow around Mammoth is 2 to 6 inches. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Total snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet with localized areas greater than 3 feet. Winds gusting as high as 55 mph at times. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 15 to 25 inches with amounts of 2 to 3 feet in the highest elevations. 4 to 8 inches of snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 10 to 20 inches with amounts around 24 inches in the highest elevations. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-191415- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Thayne, Jackson, Star Valley Ranch, Alpine, and Afton 1140 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches with locally higher amounts of 10 to 14 inches in the higher elevations and along the foothills. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Locally higher amounts of 10 to 12 inches for northern Jackson Valley, such as around Moran Junction. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-191415- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 1140 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches around Pinedale and Daniel with higher amounts of 6 to 10 inches nearby Bondurant. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann Action: Continued Issued At: 2025-12-18 12:40:49 231 WWUS45 KRIW 181840 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1140 AM MST Thu Dec 18 2025 WYZ001-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Mammoth, Old Faithful, and Lake 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations between 8 and 15 inches, with higher amounts of 2 to 3 feet in southern Yellowstone. Total snow around Mammoth is 2 to 6 inches. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Total snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet with localized areas greater than 3 feet. Winds gusting as high as 55 mph at times. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 15 to 25 inches with amounts of 2 to 3 feet in the highest elevations. 4 to 8 inches of snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-191415- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 1140 AM MST Thu Dec 18 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 10 to 20 inches with amounts around 24 inches in the highest elevations. Winds gusting as high as 60 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-191415- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Thayne, Jackson, Star Valley Ranch, Alpine, and Afton 1140 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches with locally higher amounts of 10 to 14 inches in the higher elevations and along the foothills. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Locally higher amounts of 10 to 12 inches for northern Jackson Valley, such as around Moran Junction. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-191415- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 1140 AM MST Thu Dec 18 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 6 inches around Pinedale and Daniel with higher amounts of 6 to 10 inches nearby Bondurant. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann Action: Continued Issued At: 2025-12-19 02:02:18 868 WWUS45 KRIW 190801 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 101 AM MST Fri Dec 19 2025 WYZ001-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Mammoth, Old Faithful, and Lake 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 4 to 8 inches, with higher amounts of 10 to 20 inches in southern Yellowstone. Additional snow around Mammoth of 1 to 3 inches. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 8 to 16 inches with higher elevations seeing 1 to 2 feet. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations of 10 to 20 inches with amounts of 1 to 2 feet in the highest elevations. 3 to 6 inches of additional snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations of 8 to 16 inches. Winds gusting as high as 50 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-200015- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Alpine, Star Valley Ranch, Thayne, and Afton 101 AM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow. Additional snow accumulations of 3 to 6 inches with lesser amounts of 2 to 4 inches across Star Valley. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Additional amounts of 6 to 10 inches for northern Jackson Valley, including around Moran Junction. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-200015- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 101 AM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow. Additional snow accumulations of 1 to 4. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Continued Issued At: 2025-12-19 02:02:18 868 WWUS45 KRIW 190801 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 101 AM MST Fri Dec 19 2025 WYZ001-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Mammoth, Old Faithful, and Lake 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 4 to 8 inches, with higher amounts of 10 to 20 inches in southern Yellowstone. Additional snow around Mammoth of 1 to 3 inches. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 8 to 16 inches with higher elevations seeing 1 to 2 feet. Winds gusting as high as 55 mph. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations of 10 to 20 inches with amounts of 1 to 2 feet in the highest elevations. 3 to 6 inches of additional snow is expected for South Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The hazardous conditions could impact travel along South Pass. Backcountry travel is not advised. 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 . && $$ WYZ024-200015- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 101 AM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations of 8 to 16 inches. Winds gusting as high as 50 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. Backcountry travel is not advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-200015- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Alpine, Star Valley Ranch, Thayne, and Afton 101 AM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow. Additional snow accumulations of 3 to 6 inches with lesser amounts of 2 to 4 inches across Star Valley. Winds gusting as high as 45 mph at times. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Thursday evening and Friday morning as well as evening commutes. * ADDITIONAL DETAILS...Additional amounts of 6 to 10 inches for northern Jackson Valley, including around Moran Junction. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-200015- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 101 AM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Snow. Additional snow accumulations of 1 to 4. Winds gusting as high as 40 mph at times. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Temperatures may warm above freezing during the daytime Friday which would lead to a possible transition over to a mix of rain/snow or heavy wet snow. Accumulations may be limited during this time but slick conditions could still be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Continued Issued At: 2025-12-19 18:14:29 303 WWUS45 KRIW 200013 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 513 PM MST Fri Dec 19 2025 WYZ001-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Old Faithful, Lake, and Mammoth 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 2 to 4 inches. Additional snow around Mammoth up to an inch. Winds may gust as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 2 to 6 inches across the Absarokas and 4 to 8 inches across the Tetons and Gros Ventres. Winds gusting as high as 70 mph. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 4 to 8 inches and up to 12 inches across highest terrain. 2 to 5 inches of additional snow is expected for South Pass and Union Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The 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 . && $$ WYZ024-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 4 to 8 inches. Winds gusting as high as 70 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-201200- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Star Valley Ranch, Thayne, Alpine, Jackson, and Afton 513 PM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations around an inch. Winds gusting as high as 60 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-201200- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 513 PM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations up to 3 inches. Winds gusting as high as 60 mph. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers Action: Continued Issued At: 2025-12-19 18:14:29 303 WWUS45 KRIW 200013 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 513 PM MST Fri Dec 19 2025 WYZ001-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Yellowstone National Park- Including the cities of Old Faithful, Lake, and Mammoth 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 2 to 4 inches. Additional snow around Mammoth up to an inch. Winds may gust as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult, especially in the backcountry. 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 . && $$ WYZ002-012-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Absaroka Mountains-Teton and Gros Ventre Mountains- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 2 to 6 inches across the Absarokas and 4 to 8 inches across the Tetons and Gros Ventres. Winds gusting as high as 70 mph. * WHERE...Absaroka Mountains and Teton and Gros Ventre Mountains. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions will impact travel across Teton and Togwotee Passes. Blowing and drifting of snow is expected. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-015-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Wind River Mountains West-Wind River Mountains East- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 4 to 8 inches and up to 12 inches across highest terrain. 2 to 5 inches of additional snow is expected for South Pass and Union Pass. Winds could gust as high as 60 to 70 mph with locally stronger gusts possible. * WHERE...Wind River Mountains East and Wind River Mountains West. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. The 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 . && $$ WYZ024-201200- /O.CON.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ Salt River and Wyoming Ranges- 513 PM MST Fri Dec 19 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations of 4 to 8 inches. Winds gusting as high as 70 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be very difficult including over Salt River Pass. Blowing snow could significantly reduce visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-201200- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley- Including the cities of Star Valley Ranch, Thayne, Alpine, Jackson, and Afton 513 PM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations around an inch. Winds gusting as high as 60 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. 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 . && $$ WYZ025-201200- /O.CON.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Upper Green River Basin Foothills- Including the cities of Pinedale 513 PM MST Fri Dec 19 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST SATURDAY... * WHAT...Additional snow accumulations up to 3 inches. Winds gusting as high as 60 mph. * WHERE...Upper Green River Basin Foothills. * WHEN...Until 5 AM MST Saturday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers Action: Expired Issued At: 2025-12-20 05:41:07 983 WWUS45 KRIW 201140 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 440 AM MST Sat Dec 20 2025 WYZ001-002-012-014-015-024-201245- /O.EXP.KRIW.WS.W.0015.000000T0000Z-251220T1200Z/ 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 Mammoth, Lake, and Old Faithful 440 AM MST Sat Dec 20 2025 ...WINTER STORM WARNING WILL EXPIRE AT 5 AM MST EARLY THIS MORNING... Light snow will continue through the rest of the morning, with little additional accumulation. Thus, the threat has ended. $$ WYZ013-023-025-201245- /O.EXP.KRIW.WW.Y.0038.000000T0000Z-251220T1200Z/ Jackson Hole-Star Valley-Upper Green River Basin Foothills- Including the cities of Afton, Jackson, Thayne, Alpine, Pinedale, and Star Valley Ranch 440 AM MST Sat Dec 20 2025 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 5 AM MST EARLY THIS MORNING... Snow has ended this morning and the threat has ended. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||