Southern California faced significant weather challenges as heavy rain prompted a flash flood advisory and widespread road closures early Monday. Key highways, including the 5 Freeway through the Grapevine and parts of the Pacific Coast Highway in Malibu, were shut down due to snow, flooding, and mudslides. Downtown L.A.’s 101 Freeway reopened at 6 a.m., but conditions remain hazardous across the region.
Burn Areas Face Elevated Risks of Debris Flows
Burn scars from recent wildfires, including the Eaton, Franklin, and Palisades fires, have become hotspots for debris flow threats. The National Weather Service warned of a 10% to 20% chance of flash flooding in these areas, emphasizing the dangers of mud, rock, and debris flows. These risks are heightened in burned terrain, where fire-hardened soil repels water, allowing it to rush downhill with destructive force.
Community Disruptions and Evacuations
In Malibu, Pacific Coast Highway closures extended to Topanga Canyon, with ash-laden water reported reaching the beach. Meanwhile, in Woodland Hills, residents worked to free vehicles trapped by mudslides. The Santa Monica-Malibu Unified School District preemptively closed all Malibu schools Monday due to hazardous road conditions.
Localized Downpours Amplify Risks
Heavy, localized rain continues to batter Los Angeles County, with rainfall rates nearing the half-inch-per-hour threshold that could trigger debris flows in burn areas. Areas near Pepperdine University reported rainfall rates of 0.39 inches per hour Sunday evening.
Emergency Services and Community Response
In Pacific Palisades, Los Angeles Fire Department crews worked through the night to clear mudslides from major roads. Flash flood warnings were issued for areas like Malibu Creek State Park, indicating imminent risks to residents and infrastructure.
Preparing for Ongoing Challenges
As the storm persists, officials urge residents to prepare for worst-case scenarios, particularly in wildfire-devastated regions. The storm, which began Saturday night, has already delivered up to an inch of rain in some areas, with more expected through Monday. The community’s resilience will be tested as Southern California faces the dual challenges of recovery from recent wildfires and the ongoing deluge.