A series of storms enhanced by an atmospheric river slammed much of California, bringing heavy rain and mountain snowfall to the state. Rainfall was particularly noteworthy in Southern California, as Downtown Los Angeles saw their wettest Christmas Eve and Day in 54 years.

An even more potent atmospheric river-fueled storm is on a collision course with California after a first storm triggered deadly flooding and evacuations over the weekend in Northern California.

The National Weather Service (NWS) issued "life-threatening" flash flood warnings for parts of Southern California. Newsweek's live blog is closed.

Parts of Los Angeles County burned by wildfires earlier this year remained vulnerable to flash flooding, mudslides, and debris flows.

Two children were killed and a driver was arrested following a multi-vehicle crash on Interstate 5 on Christmas Day in northern Los Angeles County, according to the California Highway Patrol. The

A California storm on Christmas Eve caused flooding and mudslides, and prompted evacuations, power outages, and travel warnings as heavy rains hit the region.

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

Another wave of rain was hitting the Los Angeles area on Friday, adding to the record-setting precipitation over Christmas.