On September 18, 2026, the National Weather Service issued a Flash Flood Warning for the Wapiti Burn Area in northeastern Boise County, Idaho, in the Idaho City area.
The warning was issued at 5:21 PM MDT and again at 5:47 PM MDT, and expired at 8:15 PM MDT. Emergency management reported heavy rain over the burn scar.
Why burn scars flood so fast
After a wildfire, the land loses the vegetation that would normally slow and soak up rainfall. Ash and heat-altered soil shed water instead of absorbing it, so heavy rain turns into fast-moving runoff in minutes — even from storms that would not flood unburned ground.
Safety note
If you come across a flooded roadway, do not try to drive through it — turn around. Even shallow-looking water can hide a washed-out road.
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