A radar view of the storm on Thursday morning that is forecast to bring rain across the state this weekend.
Southern California freeways are a mess Thursday morning as cars spun out on rainy roadways and at least 20 cars were damaged after a big-rig accident.
One death is reported.
A storm overnight dumped about a quarter-inch of rain in Los Angeles and left roads treacherous.
Several pre-dawn spinouts have blocked lanes. A multicar pileup killed one person and injured two more in the San Fernando Valley.
The California Highway Patrol said it's unclear whether rain caused a big-rig truck to overturn and crash into a center divider on Interstate 5 near Glendale shortly before 2:30 a.m. Only one lane is open and several other cars were damaged by debris.
Showers and high surf advisories are in the forecast through the weekend. About half-an-inch of rain is forecast to drop through Saturday, with about another half-inch of rain forecast for Sunday alone.