Southern Californians evacuated their homes for the second time this year, but this time, it’s for heavy rain and debris flows that threaten new destruction in areas still recovering from last month’s devastating wildfires.

A swift debris flow swept a Los Angeles Fire Department vehicle off the Pacific Coast Highway and into the ocean as heavy rain fell across Southern California on Thursday, creating deluges of water and mud on roads at the bottom of hillsides left barren by recent wildfires.

Snow, wind and the heaviest rain event of the season is expected this week in portions of Southern California prompting a flood watch warning.