Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

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Last Map Update: Wed, Dec 10, 2025 at 8:26:44 pm MST

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National Weather Service Great Falls, MT

High Wind Warning

Avalanche Warning

Flood Warning

Winter Weather Advisory

Flood Advisory

Wind Advisory

Winter Storm Watch

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Air Stagnation Advisory

Hazardous Weather Outlook

Hydrologic Outlook

Atmospheric River This Week

High Wind Threat Today and Thursday

🚨 ICYMI: Significant Atmospheric River this Week 🚨 Multiple rounds of Pacific moisture from Atmospheric Rivers will target the Northern Rockies through Thursday (Dec 11). This long-duration event could bring moisture totals rivaling historic amounts for this time of year. ⚠️ Key Impacts & Concerns: 💧Risk for roadway ponding, urban flooding, including basements. 📈 Sharp rises on creeks and streams. 🪨 Risk for rock and mudslides in steep terrain. 📍 Flood Watch Area: The greatest flood risk is across Idaho, Clearwater Counties in Idaho, and Lincoln, Flathead, Lake, Sanders, Mineral Counties in Montana, where a Flood Watch is in effect. ❄️Heavy, wet mountain snow above 7,000-8,000 ft bringing changeable avalanche conditions! Check www.avalanche.org for the latest forecasts.

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Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

NWS Forecast Office Missoula, MT