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Home Return to list Winter Storm Warning 0012 Issued by the Riverton Forecast Office
Action: New Issued At: 2025-12-04 03:23:14 211 WWUS45 KRIW 040922 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 222 AM MST Thu Dec 4 2025 WYZ012-024-050000- /O.UPG.KRIW.WS.A.0009.251205T0000Z-251206T2100Z/ /O.NEW.KRIW.WS.W.0012.251205T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 222 AM MST Thu Dec 4 2025 ...WINTER STORM WARNING IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. High elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Gerhardt Action: Continued Issued At: 2025-12-04 03:37:34 604 WWUS45 KRIW 040937 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 237 AM MST Thu Dec 4 2025 WYZ012-024-050000- /O.CON.KRIW.WS.W.0012.251205T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 237 AM MST Thu Dec 4 2025 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. High elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-002-008-013-014-023-025-050000- /O.NEW.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains-Bighorn Mountains West-Jackson Hole-Wind River Mountains West-Star Valley-Upper Green River Basin Foothills- Including the cities of Afton, Thayne, Old Faithful, Jackson, Alpine, Mammoth, Star Valley Ranch, Lake, and Pinedale 237 AM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 6 to 10 inches for Jackson Valley, Star Valley, and the Upper Green River Basin. Total snow accumulations of 8 to 12 inches across Yellowstone National Park, the Absarokas, western Wind River Mountains, and the northern portions of the western Bighorns are expected with the highest elevations potentially seeing up to 20 inches. Winds gusts between 30 and 40 mph will be common across the Absarokas with isolated gusts above 45 mph. * WHERE...Portions of central, north central, northwest, and west central Wyoming. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could become very difficult, including through Hoback Canyon. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds look to accompany the heavy snowfall which may create reduced visibility and drifting snow. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Gerhardt Action: Continued Issued At: 2025-12-04 06:17:39 953 WWUS45 KRIW 041217 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 517 AM MST Thu Dec 4 2025 WYZ012-024-050330- /O.CON.KRIW.WS.W.0012.251205T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 517 AM MST Thu Dec 4 2025 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-002-050330- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 517 AM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 1 to 2 feet in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Winds gusting as high as 45 mph over the Absarokas through the period. Gusts as high as 35 mph in Yellowstone NP Friday night. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. 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 . && $$ WYZ008-050330- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Bighorn Mountains West- 517 AM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 8 to 16 inches from Cloud Peak and Granite Pass northward. Minimal snowfall amounts south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite Pass. The hazardous conditions could impact the Thursday evening and Friday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-050330- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Thayne, Alpine, Star Valley Ranch, and Afton 517 AM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations between 7 and 12 inches, with locally higher amounts up to 18 inches in the foothill areas. * WHERE...Jackson Hole and Star Valley. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. 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 . && $$ WYZ014-025-050330- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 517 AM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations 6 to 9 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Accumulations of 8 to 16 inches in the mountains. Winds gusting as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult through Hoback Junction. The hazardous conditions could impact the Thursday evening and Friday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . TL Action: Continued Issued At: 2025-12-04 13:29:26 690 WWUS45 KRIW 041929 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1229 PM MST Thu Dec 4 2025 WYZ012-024-051300- /O.CON.KRIW.WS.W.0012.251205T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1229 PM MST Thu Dec 4 2025 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 20 inches across much of the area with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A brief lull in snowfall rates may occur during the day Friday with the heaviest snowfall likely to arrive Friday night through Saturday morning. Gusty winds of 20 to 30 mph look to accompany the heavy snowfall which may create reduced visibility and drifting snow. 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 . && $$ WYZ001-002-051300- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1229 PM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 20 to 30 inches in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Winds gusting as high as 45 mph over the Absarokas through the period. Gusts as high as 35 mph in Yellowstone NP Friday night. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ008-051300- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Bighorn Mountains West- 1229 PM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations of 10 to 18 inches from Cloud Peak and Granite Pass northward. Minimal snowfall amounts south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the Thursday evening and Friday morning commutes. 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 . && $$ WYZ013-023-051300- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Star Valley Ranch, Thayne, Alpine, and Afton 1229 PM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations between 5 and 10 inches, with locally higher amounts of 12 to 16 inches in the foothill areas. * WHERE...Jackson Hole and Star Valley. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-025-051300- /O.CON.KRIW.WW.Y.0034.251205T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1229 PM MST Thu Dec 4 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 PM MST SATURDAY... * WHAT...Snow expected. Total snow accumulations 6 to 9 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Accumulations of 10 to 18 inches in the mountains. Winds gusting as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...From 5 PM this afternoon to 2 PM MST Saturday. * IMPACTS...Travel could be very difficult through Hoback Junction. The hazardous conditions could impact the Thursday evening and Friday morning commutes. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Continued Issued At: 2025-12-05 01:45:14 067 WWUS45 KRIW 050744 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1244 AM MST Fri Dec 5 2025 WYZ012-024-052300- /O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1244 AM MST Fri Dec 5 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Heavy snow expected. Additional snow accumulations of 10 to 20 inches with the highest elevations seeing 2 to 3 feet. Gusty winds of 25 to 40 mph will be common. Higher elevations of the Salt River and Wyoming Ranges could gust above 45 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 5 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the snow accumulations will occur. Gusty west winds of 25 to 40 mph, and possibly above 45 mph across higher elevations, occur after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-002-052300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Old Faithful, Mammoth, and Lake 1244 AM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of 20 to 25 inches in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Gusty winds of 20 to 35 mph across Yellowstone National Park and 30 to 50 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 4 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty winds are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ WYZ008-052300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Bighorn Mountains West- 1244 AM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 8 to 15 inches from Cloud Peak and Granite Pass northward. Snow amounts of 1 to 5 inches south of Powder River Pass. * WHERE...Bighorn Mountains West. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-052300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Afton, Thayne, Star Valley Ranch, and Alpine 1244 AM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches, with locally higher amounts of 9 to 14 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between 1 and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 25 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ WYZ014-025-052300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1244 AM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 6 to 8 inches toward Bondurant/Hoback Junction; amounts of 2 to 4 inches near Pinedale. Additional snow accumulations of 10 to 20 inches in the mountains. Gusty winds of 20 to 35 mph across the Upper Green River Basin and west Wind River Mountains, and up to 45 mph across the highest elevations. Wind gusts as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...Snow is expected to lighten in intensity between 8AM and 2PM Friday, with accumulations generally between a Trace and 3 inches. Moderate to heavy snowfall begins after 3PM Friday and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 35 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Gerhardt Action: Continued Issued At: 2025-12-05 13:53:21 309 WWUS45 KRIW 051953 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1253 PM MST Fri Dec 5 2025 WYZ008-061300- /O.UPG.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ /O.EXB.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 1253 PM MST Fri Dec 5 2025 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 10 to 18 inches over central and northern portions of the Bighorns. Snow amounts of 1 to 6 inches are forecast for the southern portion. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the Friday evening and Saturday morning commutes. * ADDITIONAL DETAILS...Heavy periods of snow are expected Saturday morning when snowfall rates of 1 or more inches will be possible. 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 . && $$ WYZ012-024-061300- /O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1253 PM MST Fri Dec 5 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 6 to 12 inches with higher elevations seeing an additional foot or two of snow. Winds gusting as high as 60 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the snow accumulations will occur. Gusty west winds of 25 to 40 mph, and possibly above 45 mph across higher elevations, occur after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-002-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 2 to 6 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of one to two feet in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Gusty winds of 20 to 35 mph across Yellowstone National Park and 30 to 50 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact any travel through the area. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty winds are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ WYZ013-023-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Thayne, Star Valley Ranch, Alpine, Afton, and Jackson 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 2 to 6 inches, with locally higher amounts of 6 to 12 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 25 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-025-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches toward Bondurant/Hoback Junction; amounts of 2 to 6 inches near Pinedale. Additional snow accumulations of 10 to 20 inches in the mountains. Gusty winds of 20 to 35 mph across the Upper Green River Basin and west Wind River Mountains, and up to 45 mph across the highest elevations. Wind gusts as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening commutes. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 35 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Time and Area Extended Issued At: 2025-12-05 13:53:21 309 WWUS45 KRIW 051953 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1253 PM MST Fri Dec 5 2025 WYZ008-061300- /O.UPG.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ /O.EXB.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 1253 PM MST Fri Dec 5 2025 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 10 to 18 inches over central and northern portions of the Bighorns. Snow amounts of 1 to 6 inches are forecast for the southern portion. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST Saturday. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the Friday evening and Saturday morning commutes. * ADDITIONAL DETAILS...Heavy periods of snow are expected Saturday morning when snowfall rates of 1 or more inches will be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-024-061300- /O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1253 PM MST Fri Dec 5 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Heavy snow. Additional snow accumulations between 6 to 12 inches with higher elevations seeing an additional foot or two of snow. Winds gusting as high as 60 mph. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the snow accumulations will occur. Gusty west winds of 25 to 40 mph, and possibly above 45 mph across higher elevations, occur after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ WYZ001-002-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Lake, Old Faithful, and Mammoth 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 2 to 6 inches; accumulations of 10 to 15 inches at the South and Northeast entrances and near Pahaska; locally higher amounts of one to two feet in the higher elevations in the Pitchstone Plateau and the western slopes of the Absarokas. Gusty winds of 20 to 35 mph across Yellowstone National Park and 30 to 50 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact any travel through the area. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty winds are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Thayne, Star Valley Ranch, Alpine, Afton, and Jackson 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 2 to 6 inches, with locally higher amounts of 6 to 12 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 25 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. 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 . && $$ WYZ014-025-061300- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1253 PM MST Fri Dec 5 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST SATURDAY... * WHAT...Snow expected. Additional snow accumulations of 4 to 8 inches toward Bondurant/Hoback Junction; amounts of 2 to 6 inches near Pinedale. Additional snow accumulations of 10 to 20 inches in the mountains. Gusty winds of 20 to 35 mph across the Upper Green River Basin and west Wind River Mountains, and up to 45 mph across the highest elevations. Wind gusts as high as 45 mph over South Pass Friday night. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening commutes. * ADDITIONAL DETAILS...Moderate to heavy snowfall begins Friday evening and continues through the overnight hours, this is when a bulk of the additional snow accumulations will occur. Gusty west winds of 20 to 35 mph are expected after sunset Friday and continue into Saturday morning. Heavy snowfall and gusty winds could cause reduced visibility and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Dziewaltowski Action: Continued Issued At: 2025-12-06 01:52:10 210 WWUS45 KRIW 060751 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1251 AM MST Sat Dec 6 2025 WYZ008-070000- /O.CON.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 1251 AM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 8 to 15 inches over central and northern portions of the western Bighorn Mountains, with higher elevations seeing up to 20 inches. Snow accumulations of 1 to 8 inches across southern portions of the Bighorns. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the travel on Saturday morning. * ADDITIONAL DETAILS...Heavy periods of snow are expected between 5AM and NOON Saturday when snowfall rates of 1 or more inches will be possible. 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 . && $$ WYZ012-024-062100- /O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1251 AM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 5 to 12 inches, with higher elevations seeing an additional 15 to 20 inches. Gusty winds of 30 to 45 mph will be common. Gusts of 60 mph are possible across the highest elevations. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact travel through midday Saturday. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Noon Saturday. Snow and gusty winds could cause reduced visibilities and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-002-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 2 to 8 inches across much of Yellowstone National Park. Higher accumulations of 8 to 15 inches across higher elevations of the Pitchstone Plateau and the western portions of the Absaroka Mountains. Gusty winds of 20 to 35 mph across Yellowstone National Park and 35 to 55 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be very difficult, with hazardous conditions impacting any travel through the area. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Noon Saturday. Snow and gusty winds could cause reduced visibilities and drifting snow. 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 . && $$ WYZ013-023-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Afton, Alpine, Thayne, and Star Valley Ranch 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 1 to 4 inches possible, with locally high amounts up to 6 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions and reduced visibilities. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Saturday morning. Snow and gusty winds could cause reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ014-025-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 1 to 4 inches from Bondurant/Hoback Junction to Pinedale and 8 to 15 inches in the mountains. Gusty winds of 20 to 35 mph possible across the Upper Green River Basin and west Wind River Mountains, and up to 50 mph across the highest elevations. Wind gusts around 45 mph over South Pass. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be difficult through Noon Saturday, especially near Bondurant/Hoback Junction. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Saturday morning. Snow and gusty winds could cause reduced visibilities. 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Gerhardt Action: Continued Issued At: 2025-12-06 01:52:10 210 WWUS45 KRIW 060751 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1251 AM MST Sat Dec 6 2025 WYZ008-070000- /O.CON.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 1251 AM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 8 to 15 inches over central and northern portions of the western Bighorn Mountains, with higher elevations seeing up to 20 inches. Snow accumulations of 1 to 8 inches across southern portions of the Bighorns. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. The hazardous conditions could impact the travel on Saturday morning. * ADDITIONAL DETAILS...Heavy periods of snow are expected between 5AM and NOON Saturday when snowfall rates of 1 or more inches will be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ012-024-062100- /O.CON.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 1251 AM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Heavy snow. Additional snow accumulations of 5 to 12 inches, with higher elevations seeing an additional 15 to 20 inches. Gusty winds of 30 to 45 mph will be common. Gusts of 60 mph are possible across the highest elevations. * WHERE...Teton and Gros Ventre Mountains and Salt River and Wyoming Ranges. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be very difficult, especially over Teton, Togwotee, and Salt River Passes. The hazardous conditions could impact travel through midday Saturday. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Noon Saturday. Snow and gusty winds could cause reduced visibilities and drifting snow. 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 . && $$ WYZ001-002-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains- Including the cities of Mammoth, Old Faithful, and Lake 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 2 to 8 inches across much of Yellowstone National Park. Higher accumulations of 8 to 15 inches across higher elevations of the Pitchstone Plateau and the western portions of the Absaroka Mountains. Gusty winds of 20 to 35 mph across Yellowstone National Park and 35 to 55 mph across the Absaroka Mountains. * WHERE...Absaroka Mountains and Yellowstone National Park. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be very difficult, with hazardous conditions impacting any travel through the area. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Noon Saturday. Snow and gusty winds could cause reduced visibilities and drifting snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ013-023-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Jackson Hole-Star Valley- Including the cities of Jackson, Afton, Alpine, Thayne, and Star Valley Ranch 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 1 to 4 inches possible, with locally high amounts up to 6 inches in the foothill areas. Gusty winds of 20 to 25 mph. * WHERE...Jackson Hole and Star Valley. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions and reduced visibilities. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Saturday morning. Snow and gusty winds could cause reduced visibilities. 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 . && $$ WYZ014-025-062100- /O.CON.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Wind River Mountains West-Upper Green River Basin Foothills- Including the cities of Pinedale 1251 AM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 2 PM MST THIS AFTERNOON... * WHAT...Snow expected. Additional snow accumulations of 1 to 4 inches from Bondurant/Hoback Junction to Pinedale and 8 to 15 inches in the mountains. Gusty winds of 20 to 35 mph possible across the Upper Green River Basin and west Wind River Mountains, and up to 50 mph across the highest elevations. Wind gusts around 45 mph over South Pass. * WHERE...Wind River Mountains West and Upper Green River Basin Foothills. * WHEN...Until 2 PM MST this afternoon. * IMPACTS...Travel could be difficult through Noon Saturday, especially near Bondurant/Hoback Junction. * ADDITIONAL DETAILS...Periods of moderate to heavy snow are possible through Saturday morning. Snow and gusty winds could cause reduced visibilities. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Gerhardt Action: Expired Issued At: 2025-12-06 15:09:23 087 WWUS45 KRIW 062108 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 208 PM MST Sat Dec 6 2025 WYZ012-024-062215- /O.EXP.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 208 PM MST Sat Dec 6 2025 ...WINTER STORM WARNING HAS EXPIRED... Snowfall rates have decreased and the Winter Storm Warning has expired. However, lighter snow with minor accumulation is still expected through tonight. Winter travel conditions remain possible over mountain passes. $$ WYZ001-002-013-014-023-025-062215- /O.EXP.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains-Jackson Hole-Wind River Mountains West-Star Valley-Upper Green River Basin Foothills- Including the cities of Mammoth, Star Valley Ranch, Afton, Thayne, Pinedale, Old Faithful, Alpine, Lake, and Jackson 208 PM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY HAS EXPIRED... Snowfall rates have decreased and the Winter Weather Advisory has expired. However, lighter snow with minor accumulation is still expected through tonight. Winter travel conditions remain possible over mountain passes. $$ WYZ008-070000- /O.CON.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 208 PM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Additional snow accumulation of 1 to 3 inches. Winds gusting as high as 35 mph may lead to areas of blowing snow. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult over Granite and Powder River 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 . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers Action: Continued Issued At: 2025-12-06 15:09:23 087 WWUS45 KRIW 062108 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 208 PM MST Sat Dec 6 2025 WYZ012-024-062215- /O.EXP.KRIW.WS.W.0012.000000T0000Z-251206T2100Z/ Teton and Gros Ventre Mountains-Salt River and Wyoming Ranges- 208 PM MST Sat Dec 6 2025 ...WINTER STORM WARNING HAS EXPIRED... Snowfall rates have decreased and the Winter Storm Warning has expired. However, lighter snow with minor accumulation is still expected through tonight. Winter travel conditions remain possible over mountain passes. $$ WYZ001-002-013-014-023-025-062215- /O.EXP.KRIW.WW.Y.0034.000000T0000Z-251206T2100Z/ Yellowstone National Park-Absaroka Mountains-Jackson Hole-Wind River Mountains West-Star Valley-Upper Green River Basin Foothills- Including the cities of Mammoth, Star Valley Ranch, Afton, Thayne, Pinedale, Old Faithful, Alpine, Lake, and Jackson 208 PM MST Sat Dec 6 2025 ...WINTER WEATHER ADVISORY HAS EXPIRED... Snowfall rates have decreased and the Winter Weather Advisory has expired. However, lighter snow with minor accumulation is still expected through tonight. Winter travel conditions remain possible over mountain passes. $$ WYZ008-070000- /O.CON.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 208 PM MST Sat Dec 6 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Additional snow accumulation of 1 to 3 inches. Winds gusting as high as 35 mph may lead to areas of blowing snow. * WHERE...Bighorn Mountains West. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult over Granite and Powder River Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Myers Action: Expired Issued At: 2025-12-06 17:55:57 537 WWUS45 KRIW 062355 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 455 PM MST Sat Dec 6 2025 WYZ008-070100- /O.EXP.KRIW.WS.W.0012.000000T0000Z-251207T0000Z/ Bighorn Mountains West- 455 PM MST Sat Dec 6 2025 ...WINTER STORM WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON... Light snow showers linger Saturday evening, but additional accumulations will be minimal. The best chance for accumulations of up to one inch will be from Granite Pass north to the Montana state line. Therefore, with snow shower intensity and coverage diminishing the winter storm warning will be allowed to expire. $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . CNJ | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||