Heavy Rain and Flash Flooding Concerns in California; Heavy Snow in the Sierra

An atmospheric river will bring heavy rainfall to lower elevations of California this week, and heavy snow to the Sierra Nevada mountains. Flash flooding, some of which may be locally considerable, will be a concern on the western foothills of the Sierra Nevada mountains through Tuesday. Landslides, rockfalls and mudslides are possible in the Southern California mountains. Read More >

Multiple rounds of thunderstorms with heavy rain are expected today. Urban street flooding and rises on some rivers and streams is possible. Where storms repeat, there would be a threat for flash flooding.

Outdoor plans today? Be ready for a multitude of impactful weather: storms, potentially heavy rain.

Today: Heavy Rain Threat

What: Thunderstorms bringing heavy rain
Where: Across the region
Timing: Periodically through this evening
Impacts: localized flooding. Ponding of water on roadways, storm sewers may backup. Mud and rock slides possible in hilly terrain. Rises on area rivers and streams
ACTION: If flooding is observed, move to higher ground. Never drive a vehicle across a flooded road - it could be washed out or car easily carried into flood waters. Exercise extreme caution at night - harder to recognize the dangers of flash flooding

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Heavy Rain and Flash Flooding Concerns in California; Heavy Snow in the Sierra

Heavy Rain, Flooding Threat Today