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.

As the downpour intensified Thursday, the National Weather Service issued flash flood and severe thunderstorm warnings for a swath of eastern Los Angeles County. The rain caused a rockslide and pushed mud onto the road in Malibu Canyon, and a large debris flow left about 8 inches (20 centimeters) of mud across a road in the Hollywood Hills.