Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

A strong atmospheric river will bring heavy rainfall to California through the holiday week. The heaviest rainfall is expected on Wednesday in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall is expected in the Sierra Nevada from the atmospheric river, raising concerns for major snow‐load impacts. Travel may be difficult to impossible over the passes. Read More >

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Last Map Update: Wed, Dec 24, 2025 at 4:12:16 am MST

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National Weather Service Great Falls, MT

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Hazardous Weather Outlook

Wintry Mix Christmas Eve - Christmas

Cold Front on Friday

Holiday Travel Planner

Periods of light precipitation in the form of snow at mountain passes, but a wintry mixture in the valleys will be possible Christmas Eve into Christmas Day. Black ice will continue to be an impact during this period.

A couple rounds of light precipitation is expected Wednesday and on Christmas bringing light snow to mountain passes and a wintry mix of rain/snow/freezing rain in the valleys. This wintry mix during the overnight hours could create slick road conditions. A cold front is expected on Friday causing widespread snow and gusty west winds. Snow showers linger into Saturday with dry conditions expected on Sunday.

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Heavy Rainfall to Bring Flooding Threat to California; Heavy Snow in the Sierra

NWS Forecast Office Missoula, MT