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.

Major insurers face billions of dollars in losses from the Los Angeles wildfires, they said this week, despite dropping clients in California before the catastrophe. AIG and Allstate and are among the national insurers that warned of losses even after they cut their exposure to the state in recent years.