WWUS45 KRIW 131929 WSWRIW URGENT - WINTER WEATHER MESSAGE National Weather Service Riverton WY 1229 PM MST Fri Dec 13 2024 WYZ012-141400- /O.UPG.KRIW.WS.A.0015.241214T1800Z-241216T0000Z/ /O.NEW.KRIW.WS.W.0020.241214T1800Z-241216T0000Z/ Teton and Gros Ventre Mountains- 1229 PM MST Fri Dec 13 2024 ...WINTER STORM WARNING IN EFFECT FROM 11 AM SATURDAY TO 5 PM MST SUNDAY... * WHAT...Heavy snow expected. Total snow accumulations of 1 to 2 feet expected (80 percent chance) for the Tetons. Total accumulations of 12 to 18 inches expected (80 percent chance) for the Gros Ventres. * WHERE...Teton and Gros Ventre Mountains. * WHEN...From 11 AM Saturday to 5 PM MST Sunday. * IMPACTS...Travel could be very difficult to impossible, especially for Teton Pass where more than foot is likely (75 percent chance). * ADDITIONAL DETAILS...High end amounts for the higher elevations of the Tetons are around 30 inches (20 percent chance of more than 30 inches). 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 . && $$ WYZ014-024-141400- /O.UPG.KRIW.WS.A.0015.241214T1800Z-241216T0000Z/ /O.NEW.KRIW.WS.W.0020.241214T1800Z-241216T0000Z/ Wind River Mountains West-Salt River and Wyoming Ranges- 1229 PM MST Fri Dec 13 2024 ...WINTER STORM WARNING IN EFFECT FROM 11 AM SATURDAY TO 5 PM MST SUNDAY... * WHAT...Heavy snow expected. Total snow accumulations of 10 to 16 inches expected (70 percent chance). Winds gusting as high as 50 mph. * WHERE...Wind River Mountains West and Salt River and Wyoming Ranges. * WHEN...From 11 AM Saturday to 5 PM MST Sunday. * IMPACTS...Travel could be very difficult to impossible along mountain passes. * ADDITIONAL DETAILS...There is about a 20 percent chance for more snow than currently forecasted along the Salt River and western Wind River Ranges. High end amounts of around 20 inches would be the result (90 percent chance of 20 inches or less). PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ WYZ001-141400- /O.UPG.KRIW.WS.A.0015.241214T1800Z-241216T0000Z/ /O.NEW.KRIW.WW.Y.0038.241214T1800Z-241216T0000Z/ Yellowstone National Park- Including the cities of Mammoth, Lake, and Old Faithful 1229 PM MST Fri Dec 13 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM SATURDAY TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations between 2 and 6 inches expected (90 percent chance) for a majority of the park. Higher totals expected for Madison and Pitchstone Plateaus, where 15 to 25 inches are expected (80 percent chance). Winds gusting as high as 30 mph, with isolated higher gusts. * WHERE...Yellowstone National Park. * WHEN...From 11 AM Saturday to 5 PM MST Sunday. * IMPACTS...Travel could be very difficult to impossible. Snow combined with wind may limit visibilities at times. * ADDITIONAL DETAILS...Total snow accumulations of 6 to 10 inches expected near Old Faithful and accumulations of 1 to 3 inches expected near 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 . && $$ WYZ013-141400- /O.UPG.KRIW.WS.A.0015.241214T1800Z-241216T0000Z/ /O.NEW.KRIW.WW.Y.0038.241214T1800Z-241216T0000Z/ Jackson Hole- Including the cities of Jackson 1229 PM MST Fri Dec 13 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM SATURDAY TO 5 PM MST SUNDAY... * WHAT...Snow expected. Total snow accumulations between 4 and 8 inches expected (70 percent confidence). Jackson town is likely (70 percent chance) to get 4 to 6 inches, though there is a 20 percent chance to receive up to 9 inches. * WHERE...Jackson Hole. * WHEN...From 11 AM Saturday to 5 PM MST Sunday. * IMPACTS...Travel could be very difficult. South to southwest wind gusts of 20 to 30 mph occur Saturday night into Sunday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For graphical depictions of the snowfall forecast, including the official NWS forecast, high end amounts, and low end amounts, visit https://weather.gov/riw/winter . For winter road conditions from the Wyoming Department of Transportation, visit https://wyoroad.info . && $$ For more information from the National Weather Service, visit https://weather.gov/riw/ . Wittmann