Flash Flood Watch Throughout San Diego Area

Posted on December 20, 2010

National Weather Service issued a Flash Flood Watch for significant portions of Southern California Monday, including most of San Diego County.

A large Pacific plume of moisture ahead of advancing trough of low pressure is expected to bring heavy rains and the potential for areas of serious flooding from mid-day Monday through Wednesday. Rainfall rates near or greater than one inch per hour are possible at times.

Excessive runoff may also cause flooding of most streams and washes, and along low lying areas adjacent to rivers. Mud and debris flows are possible, especially below steep terrain and areas with little vegetation.

Additionally, thunderstorms could accompany a cold front on Wednesday — further increasing the likelihood of flash floods and mud slides.