Prolonged Atmospheric River Will Impact the Northwest Early this Week

A weather system in the Pacific Northwest will produce rain throughout the day, before a potent atmospheric river produces a prolonged round of heavy rainfall, widespread urban and river flooding, and high elevation snow to the region Monday through Wednesday. Showers and thunderstorms may produce isolated damaging winds, a brief tornado, and locally heavy rainfall across parts of Florida today. Read More >

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Last Map Update: Wed, Dec 10, 2025 at 12:24:10 pm MST

Watches, Warnings & Advisories

National Weather Service Great Falls, MT

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Winter Storm Warning

High Wind Warning

Avalanche Warning

Winter Weather Advisory

Wind Advisory

Winter Storm Watch

Flood Watch

Hazardous Weather Outlook

Hydrologic Outlook

Significant Ice Possible

Winter Weather Advisory

Winter Storm Watch

There is moderate to high confidence of freezing occurring from noon today and lasting until noon Thursday. Accumulation of up to 15 hundredths of an inch is possible in the orange area (from Whitewater through Glasgow). This amount of ice can cause power outages. Expect roads to become hazardous if nearly impossible to travel on.

A Winter Storm Watch has been issued for portions of Northeast Montana from Thursday evening through Saturday morning. Snowfall totals will range from 4 inches in the northeast part of the watch to 14 inches in the southwest portion of the watch. Winds could gust up to 30 mph. There is moderate to high confidence of low visibility conditions occurring to make travel very difficult. Make sure you stay ahead of the storm with the latest forecast and always be prepared for potential impacts.

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Prolonged Atmospheric River Will Impact the Northwest Early this Week

NWS Forecast Office Glasgow, MT