LOS ANGELES — Flash-flood watches are being posted for some of the mountain and high-desert areas of Southern California.
The National Weather Service says a moist and unstable air mass will bring the potential for Friday afternoon and evening thunderstorms to mountain ranges from Los Angeles County to Santa Barbara County as well as the Antelope and Cuyama valleys.
Meteorologists say any thunderstorms that do form will move slowly and may have periods of heavy rain, cloud-to-ground lightning, gusty winds and small hail.
The flash-flood watch will last into the evening.
The watch area excludes the Santa Monica Mountains.