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 11:14:23 am PST

Watches, Warnings & Advisories

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National Weather Service San Francisco Bay Area, CA

National Weather Service San Joaquin Valley, CA

Winter Storm Warning

High Wind Warning

Avalanche Warning

Gale Warning

Winter Weather Advisory

Flood Advisory

Wind Advisory

Beach Hazards Statement

Flood Watch

Special Weather Statement

Marine Weather Statement

Winter Storm Warning

Winter Hazards - Greater Reno Area

Wind Hazards

Eastern Sierra Avalanche Danger

Sierra Travel Forecast

Winter Storm Warning for NE California, Tahoe, and Mono Co in effect until10 AM Friday. Expect significant travel impacts through Friday.

A Winter Weather Advisory for the Greater Reno-Carson City-Minden area in effect until 4 AM Friday. Snow impacts are most likely above 5500 feet where 2 to 6 inches (locally up to 10”) is expected by Friday morning. Heaviest snowfall is anticipated Thursday night into Friday morning, but periods of light snow is possible all Thursday. High uncertainty in snow down to valley floors, but a trace to 1” of snow is on the table Thursday night into Friday AM.

A Wind Advisory has been issued for the Surprise Valley, N Washoe County, and W NV Basin and Range counties, in effect until 10 PM tonight.

The Sierra Avalanche Center and Eastern Sierra Avalanche Centers has issued a Backcountry Avalanche Warning for the Greater Lake Tahoe area and E. Sierra in Mono County in effect until 4 AM and 7 AM Friday 12/26/2025.

Heavy mountain snow and strong winds will maintain very difficult to impossible travel in and across the Sierra through Friday. Drier weather should allow for improving travel conditions this weekend, but be sure to stay up to date on road conditions by visiting CalTrans QuickMap and NV Roads.