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How mudslides form after a fire

Southern California residents in Glendora and other foothill communities were bracing Monday for potential disaster after Sunday's rain-triggered mudslide on Pacific Coast Highway. Here's how hillsides that have been burned by wildfire become prone to flash floods and dangerous mudslides during heavy rains.

Read full story: Southern California storm causes mudslide; the worst may be yet to come

Step 1: Fire burns through growth

Step 2: Rainfall

Step 3: Mudslide

Source: University of Idaho, "After the Fires: Hydrophobic Soils" by Randy Brooks

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