Severe Flood ● Closed

Flash Flood Watch issued October 22 at 2:42PM MDT until October 23 at 12:00PM MDT by NWS Boise ID, United States of America

Event time: Last updated: 2 days ago United States
Icon = what happened · ring colour = how serious: Extreme Severe Moderate Minor

Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.

* WHAT...Flash flooding and debris flows caused by excessive rainfall
are possible over the Crooked burn scar and Wapiti burn scar. Total
rainfall up to 1 inch is possible on the burn scars.

* WHERE...Wapiti and Crooked burn scars in southwest Idaho including
Highway 21 between Grandjean and Banner Summit.

* WHEN...From 6 PM MDT this evening through Friday morning.

* IMPACTS...Heavy rainfall over the Crooked and Wapiti burn scars
which could trigger flash flooding or debris flows. Residents near
the Crooked and Wapiti burn scar should prepare for potential
debris flow. Mud and debris could impact Highway 21 between
Grandjean and Banner Summit.

* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over the Crooked and Wapiti burn scar, which may lead to
flash flooding and debris flows.
- Some locations that may experience flash flooding include...
Grandjean and Highway 21 between Grandjean and Banner Summit.
- https://www.weather.gov/safety/flood

Measurements

Coordinates39.9645, -100.8105
RegionBoise Mountains
Location Precisioncountry
Issuing AuthorityUnited States of America — us-noaa-nws-en
Cap UrgencyFuture
Cap CertaintyPossible
Cap Expires2026-10-23T12:00:00-06:00

Official source

Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.

This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.

Severity as published by WMO Alert Hub (national weather services).

View original report

This event as JSON · API and licence

Source updated 11 days ago (Oct 22, 2026 20:44 UTC) · we last heard from WMO Alert Hub (national weather services) 39 seconds ago

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About this location

The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.

Area as the agency stated it: Boise Mountains

Official authorities in United States

If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.

More for United States →

What to do

Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.

Flood preparation, evacuation decisions, and the dangers of driving or walking through floodwater.

Open Flood Safety Guide →

Earlier flood events in United States

Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.

Flash Flood Warning — Bertie, NC; Chowan, NC; Gates, NC; Hertford, NC; Perquimans, NC Severe Flood United States closed via NWS Sep 22, 2026 Flash Flood Warning — Chaves, NM Severe Flood United States closed via NWS Sep 22, 2026 Flash Flood Warning issued September 22 at 2:30PM MDT until September 22 at 5:30PM MDT by NWS Albuquerque NM, United States of America Severe Flood United States closed via WMO Sep 22, 2026 Flash Flood Warning issued September 22 at 2:27PM MDT until September 22 at 5:30PM MDT by NWS Albuquerque NM, United States of America Severe Flood United States closed via WMO Sep 22, 2026

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Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.