A flash flood warning was issued Sunday night for areas burned by the Franklin and Palisades fires, including parts of Malibu and the Santa Monica Mountains, as thunderstorms develop.
The Bureau of Meteorology issued a warning for the area at 7:40 p.m. The warning is expected to remain in effect until 11 p.m.
“Life-threatening debris flows could occur, although this is unlikely to happen anytime soon,” the Bureau of Meteorology said.
The warning was issued after radar and rain gauges showed the thunderstorm was causing “heavy rain across the entire warning area,” including Malibu. Malibu Creek State Park near Calabasas. Malibu Canyon and Las Bergenes roads through the Santa Monica Mountains.
A flash flood warning is the highest level of warning for potential flooding.
The Japan Meteorological Agency said mud, rock and debris flows could affect roads and homes in and beneath the burn site.
The National Weather Service said 0.39 inches of rainfall per hour was reported near Pepperdine University, but “higher rainfall amounts are likely to occur.”
Forecasters said debris flows could occur in burnt areas at rates of more than half an inch per hour.
Debris flows can occur when water flows rapidly downhill, kicking up not only mud but also stones, branches, and even rocks, which can damage cars and homes. It can be life threatening.
“Severe debris flows across roads are possible. Roads and driveways may be washed away in some locations,” the weather bureau said.
Reports of landslides and debris flows trickled in Sunday evening. Officials at Pacific Palisades City Hall said the Los Angeles Fire Department was working to clear mud from Palisades Drive Sunday night, and dark, ash-laden water reached the shore. ABC7 Eyewitness News captured footage of residents working to rescue a vehicle caught in a mudslide in Woodland Hills.
Just before 5 p.m., Caltrans announced that a landslide had occurred in the Topanga Valley, closing a section of Pacific Coast Highway. The service said it received a report of flooding along the highway at 8:15 p.m.
The National Weather Service has already issued a flood advisory for burnt areas around the Palisades, Franklin and Kenneth fire burn areas. A flood advisory means flooding is possible.
The National Weather Service also issued a flood advisory at 8:32 p.m. for a wide area of Los Angeles County, including the West Side, the 405 Freeway through Sepulveda Pass, the Los Angeles International Airport area, and parts of the South Bay of San Fernando. Valley and Hollywood Hills. Minor road flooding was reported in Venice and Santa Monica, the National Weather Service said.
At 8:54 p.m., the National Weather Service issued an additional advisory for southwestern Santa Barbara County, including along the coast from Point Conception to the city of Santa Barbara.
Santa Barbara’s advisory is set to expire at 11 p.m., and Los Angeles’ advisory is set to expire at midnight.
The Franklin Fire burned through the Malibu area, while the Kenneth Fire was ignited in the western edge of Woodland Hills and burned to the southwest.
A flood watch, the lowest level of a flood warning, means flooding is possible.
A flood watch began at 10 a.m. Sunday for the Eaton Fire burn area in the Altadena and Pasadena areas and was scheduled to continue until 4 p.m. Monday. the Palisades and Franklin fires in the Pacific Palisades and Malibu areas; Hughes Fire near Castaic Lake. The Bridge Fire occurred in the San Gabriel Mountains west and southwest of Wrightwood.
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