Likelihood of HISTORIC Northern Rockies 3-5 day precipitation and snowmelt this week in some valleys and west slopes resulting in poor drainage ponding and stream flooding threats along with rockslides. Several feet of heavy snow above 8000 feet possible.

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Last Map Update: Tue, Dec 9, 2025 at 7:36:51 am MST

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National Weather Service Great Falls, MT

Winter Storm Warning

High Wind Warning

Avalanche Warning

Winter Weather Advisory

Wind Advisory

Flood Watch

High Wind Watch

Hazardous Weather Outlook

Hydrologic Outlook

Atmospheric River This Week

Burst of Snow Wednesday Morning

Windy Late Monday into Tuesday Morning

🚨 ICYMI: Significant Atmospheric River this Week 🚨 Multiple rounds of Pacific moisture from Atmospheric Rivers will target the Northern Rockies from Monday afternoon into Thursday (Dec 8-11). 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.

Winter Weather Alert for the Wednesday Morning Commute ❄️🚗 Heads up, Northwest Montana! A quick burst of moderate to heavy snow is expected to impact travel conditions from midnight through 11 AM Wednesday. 📍 Where: Northwest Montana, specifically impacting Marias Pass, Seeley Lake, and the Flathead & Mission Valleys. ⚠️ Impacts: Snowfall Rates: Bursts of 0.5" to 1" per hour are possible. Travel: Expect slick conditions and reduced visibility during the morning commute. Snow Levels: Generally 3000-4000 ft, with brief wet snow possible in the valley floors. Please allow extra time for your commute on Highway 2, Highway 93, and Highway 200 in these areas.

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Likelihood of HISTORIC Northern Rockies 3-5 day precipitation and snowmelt this week in some valleys and west slopes resulting in poor drainage ponding and stream flooding threats along with rockslides. Several feet of heavy snow above 8000 feet possible.

NWS Forecast Office Missoula, MT