As a thunderstorm rolled slowly west out of the Palm Springs area, a 20 percent chance of rain remained in the forecast for most of Los Angeles and Orange counties.
San Clemente and the southern end of Orange County saw some mid-afternoon rain, remnants of a storm that hit San Diego County this morning.
The heaviest rain in Southern California was in the mountains flanking San Gorgonio Pass. Nearly 2 inches fell at Snow Valley, and rain was present when at least 5 trucks collided on Interstate 40 east of Barstow at midday.
The National Weather Service issued a flash flood watch for the San Gabriel Mountains and Antelope Valley, to be effective from 6 p.m. tonight through Sunday evening. The NWS said the most-significant threat was likely mud and debris flows in the Powerhouse burn scar area.
Los Angeles itself remained hazy and cloudy today, with high humidity.