California under flash flood and thunderstorm alerts with prolonged heavy rain.

Torrential rains hit the California coast on Christmas Eve, causing flash floods, tornado warnings, and debris flows, leading to a state of emergency declaration by Gov. Gavin Newsom in multiple counties. Over 43 million Americans are under flood watches in California, Nevada, and Arizona, with major cities like Los Angeles facing a life-threatening flood threat. Heavy rainfall prompted evacuations, road closures, and power outages, with additional rain expected, posing ongoing flood risks and potential mudslides and landslides throughout the region.

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