State of emergency declared in California following massive storms | USA TODAY

Trees damaged homes and power lines, leaving thousands of people in the San Francisco Bay Area without power.

RELATED: California man street surfs after heavy flooding in Santa Cruz

California declared a state of emergency Wednesday as a powerful storm generated 45-foot waves out at sea, dropped soaking rain on already saturated ground, and prompted warnings of floods and mudslides, knocking out power to more than 100,000 people.

The storm was expected to dump up to 6 inches of rain in parts of the San Francisco Bay Area where most of the region would remain under flood warnings into late Thursday night. In Southern California, the storm was expected to peak in intensity overnight into early Thursday morning with Santa Barbara and Ventura counties likely to see the most rain, forecasters said.

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