The rain is raising concerns about potential mudslides in recent burn scar areas, including Malibu, Altadena, and other regions.

Thousands of sandbags are being loaded and crews are working to prepare in anticipation of an upcoming storm that could lead to mudslides in Southern California's recent burn zones. “We recommend putting the sandbags to divert or create a dam between any area that’s an entryway into your house,

Because of the recent wildfires, parts of Southern California are vulnerable to mudslides, mudflows, and landslides. Ash and debris are created when trees and other objects are burned in wildfires, and this can cause the ground to become slick.

The National Weather Service issued a flood watch effective from 4 p.m. Sunday to 4 p.m. Monday for areas in or near burn scars created by the Palisades Fire, Eaton Fire, Hughes Fire and Bridge Fire, the latter blaze of which burned 56,000 acres last fall.

“Recent research shows that debris flows almost always happen in Southern California after wildfires, and given that there are multiple wildfires and each of them is pretty large, really we’re in a situation where the next large rainfall event is almost certain to generate some sort of debris flow.”

More than an inch of rain fell in parts of Los Angeles Monday afternoon, triggering flash flood watches and warnings in areas scorched by this month's wildfires.

More than an inch of rain fell in many areas, loosening Los Angeles hillsides burned bare by the recent blaze near the Pacific Palisades neighborhood.