Homes destroyed in the Palisades Fire in Pacific Palisades, California, on Jan. 27. (Credit: Mario Tama/Getty Images via Bloomberg)

(Bloomberg) — Weeks after wildfires that killed at least 29 people and destroyed entire neighborhoods, Southern California is facing another extreme-weather threat: Too much rain.

See also: Insurance considerations for mudslides and landslides

After drenching the northern part of the state, a massive Pacific storm will start to move south into Los Angeles this week, where it can transform burned hillsides into rivers of mud and debris. Rain has already started in San Luis Obispo and is forecast to soak Santa Barbara and Ventura counties before reaching Los Angeles.

There is a 5% to 15% chance rain will trigger debris flows across the burn scars, or scorched land left by the wildfires, the National Weather Service said. A mudslide can fill an average house in seconds.

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