Vast swaths of Los Angeles County are under a flash flood watch Wednesday as monsoonal moisture lingers in the area until at least Wednesday evening, creating the chance of rain and thunderstorms and the threat of mud and debris flows down slopes stripped bare in wildfires, forecasters said.
A flash flood watch issued by the National Weather Service will be in force through Wednesday evening in the San Gabriel Mountains and the Antelope, Santa Clarita and San Gabriel valleys. The NWS said the threat of thunderstorms and high humidity could persist through Friday.
