A voluntary evacuation warning was issued in the area of the Airport Fire burn scar due to possible debris flows, Orange County authorities said.

The storm is expected to dump 1 to 2 inches of rain along the coast and up to 4 inches in the valleys at rates that could cause problems. Some roads will be closed starting Wednesday.

The strongest wave of a powerful winter storm reached Southern California overnight, bringing flash flood warnings, dropping snow levels and a possible tornado. The heaviest rain was dumped during the early morning hours with rates near 1 inch per hour at times prompting officials to issue a flash flood warning for the Airport Fire burn

A storm is dropping significant rain across Southern California, triggering the risk of mudslides, flooding and debris flows in recent burn scar areas.