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.

A storm starting overnight Tuesday in California is expected to bring a high risk of debris flows later this week to the burn areas from the Los Angeles County fires. Between 2 and 3 inches of rain is expected to fall in the Palisades Fire area and between 3.

A powerful atmospheric river that began slamming Southern California on Wednesday prompted evacuation orders in Los Angeles County amid concerns it could bring flood threats to burn scars from wildfires that erupted in January.

With heavy rain bringing the risk of dangerous debris flows, the Los Angeles Fire Department has announced evacuation warnings — and mandatory evacuation orders for some specific addresses — in areas recently burned by wildfires.

Crews have rushed to clear out basins designed to catch mud, rocks and other debris from tumbling into neighborhoods as damaging rains approach.

According to The Weather Channel, the storm raises major concerns for flash flooding and debris flows, especially in areas recently scorched by wildfires, including the Eaton and Palisades fire zones in Southern California.

The Los Angeles Fire Department on Wednesday announced evacuation warnings that will take effect at 7 a.m. Thursday for areas in the city near recent burn areas due to high mudslide and debris flow risks.