With a storm bringing a risk of mudslides and debris flows, some areas of Los Angeles recently burned by wildfires are facing mandatory orders and warnings to evacuate their homes as the region braces for heavy rain and possible flooding.

Authorities issued evacuation warnings and orders for tens of thousands of Los Angeles residents on Wednesday after heavy rain created the potential for deadly mudslides in the Palisades Fire zone. CalFire urged citizens to be ready to flee at a moment’s notice should heavy rains create deadly rivers of mud and debris in the denuded hillsides.