Floods turned deadly in Northern California as the latest atmospheric river slammed the region over the weekend, dropping nearly a foot of rain in some places. Meanwhile, more heavy rain and flooding are forecast to persist and expand into Southern California through the Christmas holiday week.

An atmospheric river that dumped rain on California most of the week was easing Friday as New York City and other parts of the Northeast could get nearly a foot of snow.

Heavy rain and flash flooding already led to water rescues and at least one death in Northern California, local officials said. Shasta County Sheriff Michael L. Johnson on Monday declared a state of emergency to prepare for more rain and allow the state to help with hazard mitigation and search and rescue operations.

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

Much of Southern California is under a flood advisory as rain makes travel dangerous, while a snowstorm heads for the Northeastern U.S.

Drenching rain from an atmospheric river-fueled storm triggered deadly flooding and evacuations over the weekend in Northern California.

Waves of atmospheric moisture could cause urban flooding and mudslides across California this week, according to the National Weather Service.

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."