A Pacific storm pounded Southern California with heavy rain and high winds on Friday, triggering flash floods, a small tornado and mudslides that prompted the evacuation of hundreds of homes, damaged dozens of others and disrupted passenger rail service along the coast.

One person was found dead on Friday in a rain-swollen flood-control channel in the Orange County town of Garden Grove, which could mark the third storm-related fatality on the West Coast since Thursday.

Rescue teams saved two people after they were swept away in the fast-moving Los Angeles River near a homeless encampment, the Los Angeles Fire Department said.