In Santa Barbara, people living in at-risk areas were told to leave by 3 p.m. Wednesday. The National Weather Service in Los Angeles said on X around 5 p.m. local time that the storm was "rapidly intensifying" over Los Angeles County.

Street flooding and mudslides were reported across the region as the storm barreled through on Thursday evening.

Weeks after wildfires that killed at least 29 people and destroyed entire neighborhoods, Southern California is facing another extreme-weather threat: Too much rain.