The strongest rainstorm of the year has hit Southern California, prompting mud and debris flows as well as flash flood warnings for recent burn scars. The

A flash flood watch has been issued for much of Los Angeles and Ventura counties ahead of two rainstorms that will increase the potential of debris flow in burn scar areas.

Los Angeles County was placed under an updated flash flood warning by the National Weather Service on Thursday at 5:30 p.m. The warning is in effect until 8 p.m. “At 5:30 p.m., local law enforcement reported dangerous debris flows in Altadena as a result of extremely heavy rainfall that is moving over the area.