More than an inch of rain fell in parts of Los Angeles Monday afternoon, triggering flash flood watches and warnings in areas scorched by this month's wildfires.

Much-needed rain has begun to fall over Southern California, bringing relief to the drought-stricken region but also the threat of toxic runoff.

Rain is easing after Southern California’s first significant storm of the season brought weekend downpours that aided firefighters but caused ash, mud and debris to flow across streets in wildfire-burned areas.