Alameda and Contra Costa counties are under a flood advisory which was released by the National Weather Service on Friday at 5:28 a.m. The advisory is in effect until 8:30 a.m.

Orange County was placed under an updated flood advisory by the National Weather Service on Thursday at 6:46 a.m. The advisory is in effect until 7:57 a.m.

Los Angeles County is under an updated flash flood warning which was issued by the National Weather Service on Thursday at 2:32 a.m. The warning is in effect until 5 a.m.

At least some debris flow is ongoing in the Malibu area, with portions of the Pacific Coast Highway closed. The same storm system driving severe weather elsewhere in the country is fueling one of the most widespread and potent rounds of rain in Southern California since the historic January fires.

The storm, which forecasters said could produce tornadoes, is expected to strengthen Friday and move towards the central US.