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Home Return to list Winter Weather Advisory 0040 Issued by the Riverton Forecast Office
Action: New Issued At: 2025-12-25 13:22:04 554 WWUS45 KRIW 251921 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1221 PM MST Thu Dec 25 2025 WYZ001-261400- /O.NEW.KRIW.WW.Y.0040.251226T1200Z-251227T0600Z/ Yellowstone National Park- Including the cities of Lake, Mammoth, and Old Faithful 1221 PM MST Thu Dec 25 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 11 PM MST FRIDAY... * WHAT...Snow expected. Total snow accumulations between 2 and 6 inches across the lower elevations, and totals 6 to 10 inches across the higher elevations. Winds gusting as high as 45 mph. * WHERE...Yellowstone National Park. * WHEN...From 5 AM to 11 PM MST Friday. * IMPACTS...Travel will be difficult in the backcountry. * ADDITIONAL DETAILS...Locally higher amounts 12 to 20 inches over the Madison and Pitchstone Plateaus of southwest Yellowstone. Snow totals of half an inch to 3 inches around Mammoth. 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. && $$ WYZ002-012-014-024-261400- /O.NEW.KRIW.WW.Y.0040.251226T1200Z-251227T0600Z/ Absaroka Mountains-Teton and Gros Ventre Mountains-Wind River Mountains West-Salt River and Wyoming Ranges- 1221 PM MST Thu Dec 25 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 11 PM MST FRIDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 10 inches, with isolated amounts 10 to 15 inches at the highest elevations. Winds gusting as high as 45 mph. * WHERE...Wind River Mountains West, Absaroka Mountains, Teton and Gros Ventre Mountains, and Salt River and Wyoming Ranges. * WHEN...From 5 AM to 11 PM MST Friday. * IMPACTS...Travel could be very difficult, especially across mountain passes. * ADDITIONAL DETAILS...Snow totals up to 6 inches on South Pass, 5 to 10 inches on Togwotee Pass, and 5 to 10 inches on Teton Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann Action: New Issued At: 2025-12-25 13:22:04 554 WWUS45 KRIW 251921 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1221 PM MST Thu Dec 25 2025 WYZ001-261400- /O.NEW.KRIW.WW.Y.0040.251226T1200Z-251227T0600Z/ Yellowstone National Park- Including the cities of Lake, Mammoth, and Old Faithful 1221 PM MST Thu Dec 25 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 11 PM MST FRIDAY... * WHAT...Snow expected. Total snow accumulations between 2 and 6 inches across the lower elevations, and totals 6 to 10 inches across the higher elevations. Winds gusting as high as 45 mph. * WHERE...Yellowstone National Park. * WHEN...From 5 AM to 11 PM MST Friday. * IMPACTS...Travel will be difficult in the backcountry. * ADDITIONAL DETAILS...Locally higher amounts 12 to 20 inches over the Madison and Pitchstone Plateaus of southwest Yellowstone. Snow totals of half an inch to 3 inches around Mammoth. 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. && $$ WYZ002-012-014-024-261400- /O.NEW.KRIW.WW.Y.0040.251226T1200Z-251227T0600Z/ Absaroka Mountains-Teton and Gros Ventre Mountains-Wind River Mountains West-Salt River and Wyoming Ranges- 1221 PM MST Thu Dec 25 2025 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 11 PM MST FRIDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 10 inches, with isolated amounts 10 to 15 inches at the highest elevations. Winds gusting as high as 45 mph. * WHERE...Wind River Mountains West, Absaroka Mountains, Teton and Gros Ventre Mountains, and Salt River and Wyoming Ranges. * WHEN...From 5 AM to 11 PM MST Friday. * IMPACTS...Travel could be very difficult, especially across mountain passes. * ADDITIONAL DETAILS...Snow totals up to 6 inches on South Pass, 5 to 10 inches on Togwotee Pass, and 5 to 10 inches on Teton Pass. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter. For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info. && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . 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