Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

Back-to-back powerful Pacific storm systems to impact the Pacific Northwest and northern California through the end of this week with heavy rain, flooding, strong winds, and higher elevation mountain snow. A strong, long-duration atmospheric river will accompany the Pacific storms, bringing excessive rainfall and flash flooding to southwest Oregon and northwest California through the week. Read More >

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Last Map Update: Thu, Nov 21, 2024 at 4:52:11 am MST

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National Weather Service Great Falls, MT

Winter Storm Warning

Winter Weather Advisory

Hazardous Weather Outlook

Wintry mix valleys/snow on passes into Thursday

Widespread Precipitation, November 20-23

Periods of light to moderate precipitation continue into Thursday morning. Valleys will see a wintry mix, watch for icy spots as road temperatures drop to freezing by early Thursday. The valleys of Northwest Montana have the highest potential for occasional slush/snow covered roads as snow levels will be the slowest to rise there tonight. Meanwhile, passes will see periods of snow cover. Watch out for these changeable conditions and allow a little extra travel time.

Confidence is increasing in a prolonged precipitation event across the Northern Rockies from Wednesday to Saturday, associated with an atmospheric river. Abundant rainfall will raise the risk of rock and mudslides. Snow is expected mainly for higher elevations, but snow levels begin near valleys floors initially, rising to at least 4,000-5,000 feet in northwest Montana, and 5,000-7,000 feet along and south of I-90 on Thursday. Be sure to monitor forecast updates, especially if you have travel plans, particularly over mountain passes.

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Back-to-Back Pacific Storms to Impact the West Coast; Heavy Snow in the Central Appalachians

NWS Forecast Office Missoula, MT