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Southern California Faces Severe Weather with Flood Warnings and Thunderstorm Alerts

The National Weather Service warns of flash floods, heavy rain, and thunderstorms across Los Angeles and Orange counties, posing risks of flooding, debris flows, and dangerous driving conditions.

A sign reading 'Possible Mud Flow' on March 12, 2025, in Sierra Madre, California.
Sierra Madre resident Luis Nelson loads a sandbag into his truck in preparation for heavy rains from an atmospheric river storm on March 12, 2025
The National Weather Service warned nearly all of California about dangerous driving conditions on Wednesday.

Overview

  • A flash flood warning is active for Orange County until 7:30 a.m., with severe flooding risks in burn scar areas and potential debris flows impacting roads and driveways.
  • Los Angeles County is under a thunderstorm alert until 5 p.m., with heavy rainfall, minor flooding, and possible funnel clouds or weak tornadoes in some areas.
  • The National Weather Service advises residents to avoid flooded roads, seek higher ground in flood-prone areas, and follow evacuation orders if issued.
  • Driving conditions are hazardous, with risks of hydroplaning, reduced visibility, and slick roads during the first half-hour of rain; motorists are urged to slow down and maintain safe distances.
  • Residents in at-risk areas are encouraged to secure sandbags, avoid outdoor activities during gusty winds, and stay informed through local emergency alerts and updates.