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Boise, Idaho – Just minutes of heavy rainfall can trigger fast-moving debris flows in wildfire burn scars, creating sudden and life-threatening conditions with little warning across Idaho.
According to the National Weather Service in Boise, soils in burned areas become water-repellent after intense wildfire activity, preventing rainfall from soaking into the ground. Instead, water runs off rapidly, picking up ash, rocks, and debris that can surge downhill at high speeds, often exceeding 100 mph in steep terrain…