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

Snow, sleet and freezing rain were expected to continue pummeling the central Appalachians and mid-Atlantic states Wednesday, while California readied for a storm that could flood areas ravaged by the recent wildfires.

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

For the second time this year, Southern Californians are evacuating their homes as heavy rain threatens new destruction in places still recovering from last month’s devastating wildfires.

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.