Scattered rainfall and isolated thunderstorms will dampen Southern California into Friday evening, forecasters said.
Forecasters warned of possibly hazardous driving conditions due to slippery roads from accumulated oil on wet pavement.
The late-season storm originated in the Gulf of Alaska and "for a mid-May storm, the rainfall totals have been pretty impressive," the National Weather Service said on its Facebook page.
In Ventura and Los Angeles counties, rainfall amounts ranged from a quarter of an inch to about two inches. Downtown Los Angeles received 0.7 inch of rain, Pasadena received 1.02 inches and Van Nuys 0.25 inch, forecasters said.
Any thunderstorms that develop Friday could produce brief heavy rain and small hail, the National Weather Service said. Snow levels in the mountains were predicted to drop to around 5,500 feet Friday with higher elevations possibly getting an additional two to four inches of snowfall.
Temperatures were expected to remain slightly below normal throughout the weekend, with highs hovering in the 60s and 70s in the Los Angeles Basin, Kaplan said. The weekend would likely be cloudy, but the rain was expected to taper off Friday night, he said.