Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

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Last Map Update: Thu, Dec 25, 2025 at 3:38:16 pm PST

Watches, Warnings & Advisories

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Holiday Weekend Outlook

Holiday Snowfall

Winter Travel Tips

Windy Thursday

Showers continue moving from south to north this morning. Snow levels are expected to lower to 3500 feet by tonight. Gusty winds will build across the area, with the strongest winds in the Shasta Valley and along the coast south of Cape Blanco. Winds east this evening and tonight. A final wave of showers is expected Friday morning as the low weakens and moves inland. Showers decrease through Saturday morning, with stable conditions forecast into next week.

A winter storm will bring snow to the region late tonight into early Friday. The heaviest snow is expected tonight into early Thursday and again Thursday night into Friday morning. Snow levels will hover around 4500 ft (down to 3500 ft near Mt Shasta City) through Thursday afternoon, then lower to 3500 ft across the region by Thursday evening. If you have travel plans this holiday, be sure to check road conditions before venturing out.

Periods of higher mountain snow are expected tonight through Sunday night, especially in the Diamond Lake and Crater Lake areas. Be prepared for winter driving with slippery and snow covered roads possible. Be sure to check the forecast and road conditions before you travel and winterize your vehicle. Go to tripcheck.com or quickmap.dot.ca.gov to check road conditions. Practice safe winter driving - take it slow, plan for extra time to reach your destination and leave extra space between you and vehicles in front of you.

Live in SW Oregon/Northern California? Chances are you’re under a wind product tonight! The second strong system of the week arrives tonight. Multiple winter and wind products will be in effect tonight and through Thursday/Friday. The strongest winds are expected along the coast and in the Shasta Valley. Widespread gusts of 25 to 40 mph are expected with peak wind gusts in the 55-75 mph range in the windiest places (coastal headlands, Cascades and East Side higher terrain). These winds could make travel difficult for high profile vehicles, blow around unsecured objects, and in some places could bring down trees/branches and powerlines. Power disruptions/outages are possible.