Winter Storm Warning issued December 18 at 1:24AM MST until December 20 at 5:00AM MST by NWS Riverton WY
Issue date: 2025-12-18T08:24+00:00
* WHAT...Heavy snow expected. Total snow accumulations between 10 and 20 inches, with the highest amounts of 2 to 3 feet in southwestern Yellowstone. Lower elevations of northern and western Yellowstone will see 4 to 10 inches of snow with much lower amounts, less than 4 inches at Mammoth. Winds may be gusting as high as 55 mph at times. * WHERE...Yellowstone National Park. * WHEN...From 11 AM this morning to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult especially in the backcountry.
Winter Weather Advisory issued December 17 at 7:37PM MST until December 20 at 5:00AM MST by NWS Pocatello ID
Issue date: 2025-12-18T02:37+00:00
* WHAT...Snow expected. Total snow accumulations between 5 and 9 inches below 7000 feet with around 10 to 14 inches above 7000 feet. Winds gusting as high as around 40 mph. * WHERE...Big Hole Mountains, Centennial Mountains - Island Park, Bear River Range, and Caribou Range. * WHEN...From 11 AM Thursday to 5 AM MST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday evening and Friday morning commutes. Gusty winds could bring down tree branches.
