A flood watch will go into effect Wednesday afternoon across much of Los Angeles and Ventura counties as weather officials warn about heavy rainfall and debris flows. The National Weather Service has issued a flood watch from Wednesday evening until Thursday afternoon.

A storm system is expected to bring heavy rainfall and mountain snow to Southern California late Wednesday night into Thursday. Heavy downpours paired with thunderstorms and gusty winds will bring a high risk of flooding to roadways and threats of mud and debris flows,

Flood watches are in effect for most of L.A. County, with the possibility for flooding across the area. Schoenfeld said there’s a 30% to 50% chance of major flooding impacts in burn scar areas with concerns for mudslides, road erosion, debris flows and cars being stuck in mud.