Areas near burn scars, which have been damaged by wildfires, are especially susceptible to flash flooding and debris flows as Hilary moves in.
Portions of the southwestern U.S. already dealing with the aftermath of wildfires could soon face life-threatening flooding fromThe storm made landfall Sunday in the northern part of Mexico's Baja California and is expected to move north toward the southwestern U.S. for anyone living in a wildfire burn scar in the Silverado and Williams canyons. Here's what to know about the dangers posed by burn scars during heavy rainfall.Wildfires have burned through millions of acres in the U.S.
Burned soil can be as water-repellant as pavement, which means water from heavy rain is likely to run off instead of being absorbed into the dirt. In these areas, a relatively smaller amount of rain can produce a flash flood. In areas near burn scars, heavy rain can produce flash flooding and debris flows before a warning is issued. Debris flows are powerful mixtures of mud, rocks, boulders, entire trees and sometimes even homes or vehicles.
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