National Weather Service United States Department of Commerce
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Last Map Update: Wed, May 20, 2026 at 11:10:29 pm MDT

Wet and cold backcountry conditions are anticipated Wednesday night through Friday morning. Cold rainfall is expected at lower elevations, with snow possible above 6000 feet. Overnight lows will be in the 20s and 30s in the backcountry. Potential hazards include hypothermia, and slippery roads and trails. Be sure to let others know of your travel plans, have an emergency plan and kit ready, have appropriate gear for the weather, and be ready for rapidly changing conditions.
A cold front will move south across the Northern Rockies through the day today, with showers and isolated thunderstorms trailing in its wake. High temperatures will remain below normal through Thursday thanks to the cold front, with overnight lows tonight falling near to below freezing.
While temperatures may be warming up this weekend, water will still be very cold. Without proper protection, cold water shock and hypothermia can occur quickly. In fact, cold water shock can be just as severe and dangerous from water temperatures of 50 - 60 degrees Fahrenheit as it is from water at 35 degrees Fahrenheit. If going out on the water, remember to always wear a life jacket, avoid alcohol, and dress for the water temperature, not the air temperature. It is also a good idea to carry an emergency position indicating radio beacon or personal locator beacon. For more information, visit weather.gov/safety/coldwater and fwp.mt.gov/activities/boating
Here's a reminder that we have TWO virtual spotter training opportunities this week. Anyone is welcome to attend any session. The session on Wednesday will focus on severe weather in the intermountain portions of the state while the session on Thursday will focus on severe weather along the Hi-Line. Make sure to register to receive more information and a link to the virtual class. Direct web link to sign up: Direct Sign Up Link

 

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