Mudslide, flooding fears intensify as storm rolls across fire-scarred regions of California

Residents lead horses on Cuthbert Road in Malibu after a mudslide prompted authorities to ask residents in the immediate area to evacuate.

Corona fireman Charlie Apodaca, center, and his colleagues place sandbags at a business, protecting it from flooding along Temescal Canyon Road in Corona.

Vehicles navigate rock debris and a mudslide on Philip Avenue at Sea View Drive in the Malibu Park area.

Small slides with rocks and debris litter Kanan Dume Road in the Malibu hills on Thursday as rain fell on the hills burned in the Woolsey fire.

Mud and debris flow closes Temescal Canyon Road in Corona on Thursday.

Trancas Creek runoff in Malibu, blackened by debris and ash from the areas burned by the Woosley fire in the mountains above, flows into the ocean.

Mud and debris flow closes Temescal Canyon Road in Corona. Several neighborhoods in Riverside County burned by the Holy fire were ordered to evacuate late Wednesday before the storm hit.

Rainsford Place at Busch Drive in Malibu was closed due to Zuma Creek flooding Thursday

Mud and debris flow closes Temescal Canyon Road in Corona. The soil in burn areas cannot absorb a lot of moisture, so heavy rainfall can lead to fast-moving flows containing mud, debris and even trees and boulders.

The burned mountains of Corral Canyon in Malibu on Thursday.

An egret feeds in Trancas Creek, blackened by debris and ash from the areas burned by the Woosley fire in the mountains above, as it flows to the ocean.