Temperatures will hover in the mid to upper 20s as precipitation begins, creating hazardous travel conditions.

A powerful Christmas week storm is dumping rain across Southern California, putting at-risk communities on alert and prompting evacuation warnings.

Officials in Los Angeles and surrounding counties warned that the giant holiday storm could trigger "widespread flash flooding."

Atmospheric rivers dumped heavy rains on large parts of California, causing floods and mudslides and leaving three dead as of Christmas night, according to local officials.

At least three people have died and more than 110,000 homes and businesses faced power outages on Christmas Day after a powerful winter storm struck California and broke rainfall records on Wednesday, triggering road closures and flooding, as forecasters warn of more rain.

A flood watch remained for the Bay Area after the National Weather Service issued a flash flood warning overnight until 6 a.m.

Millions of people in the Northeast are under winter storm warnings for a threat of snow and ice expected to hit the region Friday into early Saturday.

Several days of rain and powerful wind gusts are in the forecast this week when a winter storm has already led to evacuation warnings in parts of Los Angeles County settles into Southern California for the holiday.