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 2:22:10 am PST

Watches, Warnings & Advisories

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National Weather Service San Joaquin Valley, CA

National Weather Service Los Angeles, CA

Special Marine Warning

Winter Storm Warning

High Wind Warning

Storm Warning

Gale Warning

Storm Watch

High Surf Advisory

Hazardous Seas Warning

Wind Advisory

Beach Hazards Statement

Flood Watch

High Wind Watch

Marine Weather Statement

Severe Weather Outlook Wednesday

Flood Watch

Beach Hazards Statement Today

Wind Hazards

Extremely Dangerous Marine Conditions

The SPC has issued a marginal risk (dark green) of severe thunderstorms and a 2% probability of tornadoes for coastal portions of the Bay Area and Central Coast on Wednesday, December 24th. Have multiple ways to receive warnings and stay weather aware tomorrow. #CAwx

A Flood Watch has been extended through 10 PM Friday across the North Bay, and has been issued from 10 AM Tuesday through 10 PM Friday for the rest of the Bay Area and Central Coast. Moderate to heavy rain associated with an atmospheric river will bring 2-5" in the valleys, with up to 6-8" in the coastal mountains. Creeks and streams could see rapid rises during and after heavy rainfall. Standing water is likely in urban areas and on low-lying roadways. Remember: Turn around, don't drown!

A Beach Hazards Statement has been issued for all beaches along the Pacific Coast from 4 PM Tuesday to 4 PM Wednesday. Hazardously strong winds will cause dangerous conditions at the coastline, including blowing sand, wind waves up to 20 feet, and poor visibility. Avoid the beach! #CAwx

The High Wind Warning has been expanded to include the City of San Francisco and interior portions of Monterey County, while continuing for exposed coastal zones in the North Bay, SF Peninsula, and Central Coast where wind gusts up to 65 mph are anticipated. A Wind Advisory continues for interior portions of the North Bay, interior Bay Area and interior Monterey County where winds up to 55 mph are expected.

Extremely dangerous marine conditions for mariners are expected this week. Storm Force winds are forecast across the coastal waters with Gale Force winds across the San Francisco Bay, and Monterey Bay starting Tuesday morning. Winds diminish to Gale Force by late Wednesday but marine conditions will remain hazardous through Friday. #CAwx