Then, a period of "heavier precipitation" will begin late on Saturday and "continue through Sunday night," it warned.
"The storm system on Sunday has the potential to be the strongest and wettest," according to the advisory.
The first of the successive four cold fronts to slide into the region from the Pacific made itself felt Wednesday. Since then, there has been a spike in the number of traffic crashes in the Greater L.A. area.
Through Sunday night, the storms are expected to produce between a quarter and three-quarters of an inch of rain in coastal and valley areas, and between three-quarters of an inch and 1.5 inches in the foothills and mountains, Weather Service forecasters said. The snow level, meanwhile, will remain high—above 8,000 feet.
The weekend's highs in Woodland Hills should be around 63 degrees and the lows will be around 55 degrees.