Los Angeles — An unusually strong storm system called an atmospheric river doused Southern California on Saturday, prompting flood warnings in areas of coastal Los Angeles County that recently were ravaged by wildfire.

The National Weather Service in Los Angeles and Oxnard reported heavy rainfall at rates as heavy as an inch per hour in coastal areas that are prone to flash flooding.

The previous day more than 4 inches of rain fell over coastal Santa Barbara County as the storm approached Los Angeles. The National Weather Service urged people to stay indoors amid heavy winds.

The long plume of tropical moisture that formed over the Pacific Ocean began drenching the San Francisco Bay Area on Wednesday and unleashed widespread rain over Southern California on Friday and Saturday. More th

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