From the Pocatello Forecast Office
...Winter storm system to bring several inches of snow to the Idaho Central Mountains Tuesday night and Wednesday... .A winter weather disturbance will bring snow to the mountains of Idaho Tuesday night and Wednesday. Snow accumulations of 2 to 6 inches is expected with accumulations of 5 to 10 inches possible above 8000 feet elevation. Travel through mountain passes may become difficult. Upper Snake Highlands-South Central Highlands-Caribou Highlands- Wasatch Mountains/Idaho Portion- Including the cities of St. Anthony, Ashton, Driggs, Victor, Henry, Soda Springs, and Montpelier ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 5 AM TO 11 PM MST WEDNESDAY... * WHAT...Snow expected. Plan on slippery road conditions, including during the evening commute on Wednesday. Total snow accumulations of 2 to 4 inches, with localized amounts up to 10 inches, are expected. * WHERE...Caribou Highlands and Wasatch Mountains/Idaho portion. Highway 30 from McCammon to Wyoming border, South Central Highlands, including Interstate 84 from Interstate 84/86 junction south to Juniper. Upper Snake Highlands including the Highway 20 corridor from Ashton Hill north to Montana and Pine Creek Pass.
From the Riverton Forecast Office
810 PM MST Tue Dec 19 2017 ...Snow moving into Northwest Wyoming tonight... .Moderate to heavy snow is expected late tonight through early Wednesday evening. Yellowstone National Park-Teton and Gros Ventre Mountains- Including the cities of Lake, Mammoth, and Old Faithful 810 PM MST Tue Dec 19 2017 ...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM TO 8 PM MST WEDNESDAY... * WHAT...Snow expected. Plan on slippery road conditions, including during the morning commute on Wednesday. Total snow accumulations of 4 to 8 inches. Localized snow amounts up to 10 inches in southwest portions of Yellowstone Park and the Tetons. * WHERE...Yellowstone National Park and Teton and Gros Ventre Mountains. * WHEN...2 AM to 8 PM Wednesday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times. Travel over Teton Pass could be hazardous at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.