Winter Storm Watch Idaho, Wyoming, Montana | Effective 03/11/2026 01:24

* WHAT...Heavy snow possible. Total snow accumulations 1 to 2 feet over the higher elevations of southern and eastern YNP. 6 to 12 inches in central portions of Yellowstone mainly above 7,500 ft, and between 1 and 4 inches in Lamar Valley and Mammoth. Winds could gust as high as 50 mph at times. * WHERE...Yellowstone National Park. * WHEN...From this evening through Saturday afternoon. * IMPACTS...Travel could be very difficult especially in the backcountry. * ADDITIONAL DETAILS...Snowfall will differ in intensity over a 3 day span with periods of moderate to heavy snowfall. Periodic wind gusts in excess of 50 mph and snowfall will likely create near whiteout conditions at times. Warm temperatures during the day will likely lead to a transition over to rain, mainly across elevations below 7,500 feet with a return to snow by nightfall.