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577 WWUS45 KRIW 172320 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 520 PM MDT Mon Mar 17 2025 WYZ001-002-012-181400- /O.CON.KRIW.WS.W.0009.000000T0000Z-250319T0000Z/ Yellowstone National Park-Absaroka Mountains-Teton and Gros Ventre Mountains- Including the cities of Old Faithful, Lake, and Mammoth 520 PM MDT Mon Mar 17 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 18 and 24 inches; amounts will range between 4 and 8 inches across the northern half of Yellowstone. Winds gusting as high as 55 mph over the higher elevations through much of the morning and subsiding by this evening. * WHERE...Absaroka Mountains, Teton and Gros Ventre Mountains, and Yellowstone National Park. * WHEN...Until 6 PM MDT Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Monday morning and evening commutes over Teton/Togwotee Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ008-009-181400- /O.CON.KRIW.WS.W.0009.250318T0000Z-250319T0500Z/ Bighorn Mountains West-Bighorn Mountains Southeast- 520 PM MDT Mon Mar 17 2025 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 12 and 24 inches over the northern end of the mountains and 12 to 15 inches over the far southern end. Amounts of 4 to 8 inches elsewhere. Winds gusting as high as 45 mph this evening and quickly decreasing. * WHERE...Bighorn Mountains. * WHEN...Until 11 PM MDT Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Tuesday morning and evening commutes over Powder River/Granite Passes. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ010-181400- /O.CON.KRIW.WS.W.0009.250318T0500Z-250319T0500Z/ Northeast Johnson County- Including the cities of Buffalo 520 PM MDT Mon Mar 17 2025 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 11 PM MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 6 and 12 inches. Winds gusting as high as 40 mph. * WHERE...Northeast Johnson County. * WHEN...From 11 PM this evening to 11 PM MDT Tuesday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Tuesday morning and evening commutes along Interstates 90 and 25. * ADDITIONAL DETAILS...The heaviest snow will occur late tonight and through Tuesday morning, especially in the Buffalo area. Snowfall rates up to 2"/hr will be possible during this time 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 . && $$ WYZ015-018-181400- /O.CON.KRIW.WS.W.0009.250318T0900Z-250319T0000Z/ Wind River Mountains East-Lander Foothills- Including the cities of Lander 520 PM MDT Mon Mar 17 2025 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 3 AM TO 6 PM MDT TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations between 5 and 8 inches near Lander; 12 to 24 inches along the east slopes of the Wind River Mountains. * WHERE...Lander Foothills and Wind River Mountains East. * WHEN...From 3 AM to 6 PM MDT Tuesday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Tuesday morning and evening commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...The heaviest snow will occur Tuesday morning, with light snow lingering through the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ003-004-181400- /O.CON.KRIW.WW.Y.0016.250318T0000Z-250319T0000Z/ Cody Foothills-North Bighorn Basin- Including the cities of Shell, Powell, Clark, Basin, Cody, Meeteetse, Greybull, and Lovell 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 4 and 8 inches, lesser amounts of 1 to 2 inches will occur from Lovell to Basin. Winds gusting as high as 40 mph by sunrise Tuesday morning and continuing through the day. * WHERE...Cody Foothills and North Bighorn Basin. * WHEN...Until 6 PM MDT Tuesday. * IMPACTS...Travel could be difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage. 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 . && $$ WYZ013-023-025-181400- /O.CON.KRIW.WW.Y.0016.250318T0000Z-250318T1800Z/ Jackson Hole-Star Valley-Upper Green River Basin Foothills- Including the cities of Pinedale, Thayne, Alpine, Star Valley Ranch, Afton, and Jackson 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 3 and 5 inches in the Jackson/Star Valleys; 2 to 4 inches in Pinedale and Bondurant. Winds gusting as high as 35 mph. * WHERE...Jackson Hole, Star Valley, and Upper Green River Basin Foothills. * WHEN...Until noon MDT Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning commute. * ADDITIONAL DETAILS...Winds will increase near Pinedale early Tuesday morning, increasing in the Jackson/Star Valleys late in the morning into the early afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ024-181400- /O.CON.KRIW.WW.Y.0016.250318T0000Z-250319T0000Z/ Salt River and Wyoming Ranges- 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 12 inches, with locally higher amounts up to 18 inches in the higher elevations. Winds gusting as high as 40 mph. * WHERE...Salt River and Wyoming Ranges. * WHEN...Until 6 PM MDT Tuesday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Tuesday morning and evening commutes over Salt River 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 . && $$ WYZ005>007-011-016-181400- /O.CON.KRIW.WW.Y.0016.250318T0500Z-250319T0000Z/ Southwest Bighorn Basin-Southeast Bighorn Basin-Owl Creek and Bridger Mountains-Southeast Johnson County-Upper Wind River Basin- Including the cities of Thermopolis, Ten Sleep, Dubois, Worland, and Kaycee 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 6 PM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 3 and 6 inches, with Worland occurring on the lower end of this range; 6 to 12 inches in the higher elevations. Winds gusting as high as 45 mph. * WHERE...Owl Creek and Bridger Mountains, Southwest Bighorn Basin, Upper Wind River Basin, Southeast Bighorn Basin, and Southeast Johnson County. * WHEN...From 11 PM this evening to 6 PM MDT Tuesday. * IMPACTS...Travel could be difficult, especially through the Wind River Canyon. The hazardous conditions could impact the Tuesday morning and evening commutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ017-020-181400- /O.CON.KRIW.WW.Y.0016.250318T0900Z-250319T0000Z/ Wind River Basin-Natrona County Lower Elevations- Including the cities of Riverton, Casper, and Shoshoni 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 6 PM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 3 and 5 inches; lower amounts near 2 inches expected in the Casper area. Winds gusting as high as 45 mph. * WHERE...Natrona County Lower Elevations and Wind River Basin. * WHEN...From 3 AM to 6 PM MDT Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday morning and evening 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 . && $$ WYZ019-022-181400- /O.CON.KRIW.WW.Y.0016.250318T0900Z-250319T0500Z/ Green Mountains and Rattlesnake Range-Casper Mountain- Including the cities of Jeffrey City 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 11 PM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations between 6 and 12 inches on Casper Mountain; amounts around 6 inches near Jeffrey City and up to 12 inches near Beaver Rim. Winds gusting as high as 35 mph. * WHERE...Casper Mountain and Green Mountains and Rattlesnake Range. * WHEN...From 3 AM to 11 PM MDT Tuesday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ028>030-181400- /O.CON.KRIW.WW.Y.0016.250318T1200Z-250319T1200Z/ Rock Springs and Green River-Flaming Gorge-East Sweetwater County- Including the cities of Rock Springs, Wamsutter, and Green River 520 PM MDT Mon Mar 17 2025 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 AM TUESDAY TO 6 AM MDT WEDNESDAY... * WHAT...Snow expected. Total snow accumulations between 3 and 6 inches. Winds gusting as high as 45 mph. * WHERE...East Sweetwater County, Flaming Gorge, and Rock Springs and Green River. * WHEN...From 6 AM Tuesday to 6 AM MDT Wednesday. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the Tuesday morning and evening commutes along Interstate 80. * ADDITIONAL DETAILS...Bursts of heavier snow are likely Tuesday afternoon over the eastern end of Sweetwater County, from Point of Rocks eastward. 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