Flood advisory extended for L.A. County as officials warn of thunderstorms, mudslides

Rong-Gong Lin II, Los Angeles Times on Nov 17, 2025

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L.A. County was facing a chance of thunderstorms, strong winds that could topple trees and downpours Monday evening as another storm moved through Southern California following a weekend of sometimes heavy rain.

The National Weather Service warned that thunderstorms were likely as the storm system pushed through Los Angeles. A flash flood warning was issued for a swath of the county, including the San Fernando and Santa Clarita valleys, into Monday evening.

A flood advisory — meaning flooding caused by excessive rainfall is expected — was issued until midnight. The advisory was in place for a wide swath of northern and western L.A. County, including Malibu; the San Fernando, San Gabriel and Santa Clarita valleys; and eastern Ventura County, including Thousand Oaks and Simi Valley.

"Convective storms will bring increased risk of strong to locally damaging winds, lightning, small hail and isolated waterspouts," the weather service office in Oxnard said just before 2 p.m. "Briefly heavy downpours could cause localized flash flooding and debris flows in recent burn scars."

There's a 40% to 50% chance that rain could fall so fast it triggers debris flow in the Palisades, Eaton and Bridge burn scars. A debris flow is a type of landslide in which rain falls rapidly down a hillside and collects mud and other debris along the way. They can be minor, covering roads and driveways with muck, or large and destructive, capable of moving cars at speeds of up to 35 mph and pummeling homes with boulders and a wall of mud.

A brief, weak tornado remains possible somewhere over the L.A. Basin. Other threats for L.A. County through Monday evening include flooding of roads and small streams, as well as rockslides.

Monday's storm already was causing problems to the northwest of Los Angeles. Large trees fell and roadways were flooded in Santa Barbara and San Luis Obispo counties earlier Monday. Highway 1 had to be closed near Santa Maria because of flooding around the Rancho Maria Golf Course; a minor debris flow covered most of Highway 46 in mud and debris roughly halfway between Paso Robles and Cambria; and heavy rainfall caused the Conejo Creek to flood farm fields near the 101 Freeway in Camarillo, according reports filed to the weather service.