Severe · Flash Flood WarningThis alert has expired. It is kept for reference.

Flash Flood Warning issued September 18 at 5:21PM MDT until September 18

Affecting Boise, ID

In effect until: Sep 19, 2026, 2:15 AM

Boise, ID

Likely impact in Boise, ID; effects through 2:15 AM.

Get to higher ground now. Never drive through flooded roads.

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FFWBOI

The National Weather Service in Boise has issued a

* Flash Flood Warning for...
The Wapiti Burn Area in...
Northeastern Boise County in southwestern Idaho...

* Until 815 PM MDT.

* At 521 PM MDT, emergency management reported thunderstorms
producing heavy rain over the Wapiti Burn Area. The expected
rainfall rate is 0.25 inches in 1 hour. Additional rainfall amounts
up to 0.5 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly. Excessive rainfall over the
burn scar will result in debris flow. The debris flow can consist
of rock, mud, vegetation and other loose materials.

HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding in and around the Wapiti Burn Area.

SOURCE...Emergency management reported debris on Idaho State
Highway 21 between mileposts 103 and 105.

IMPACT...Life threatening flash flooding of areas in and around the
Wapiti Burn Area.

* Some locations that will experience flash flooding include...
Warm Springs Guard Station.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Flash Flood Warning issued September 18 at 5:21PM MDT until September 18

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