A new rain storm is bearing down on California, including fire-ravaged Los Angeles, where residents are bracing for the possibility of mudslides and landslides.

An atmospheric river is expected to bring torrential rain to California this week, threatening parts of the state with flash floods and mudslides.

Threat level: The heavy rains will bring a "high likelihood" of flooding, the National Weather Service warns. The greatest risk is for mudslides and debris flows in Southern California's large, recent burn scars.

Southern California is in desperate need of rain, but it could come far too fast this week, especially in areas recently burned by wildfires.

Another atmospheric river is preparing to take aim at the Bay Area and Central California, bringing “impactful rain,” flash flooding and potentially even a light dusting of snow to this week’s forecast as temperatures plummet.

Areas charred by last month's wildfires in Southern California now face a new threat from a powerful, but fast-moving Pacific storm. Here's what you need to know about this threat.