Severe Flood ● Closed
Flash Flood Watch issued September 17 at 10:18AM MDT until September 20 at 12:00AM MDT by NWS Great Falls MT, United States of America
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* WHAT...Flash flooding and debris flows caused by excessive rainfall
are possible over the Horse Gulch area and burn scars from the
summer of 2026.
* WHERE...Portions of central, north central, and southwest Montana,
including the following areas, in central Montana, Big Belt,
Bridger and Castle Mountains, Canyon Ferry Area, Elkhorn and
Boulder Mountains, Gates of the Mountains, Little Belt and Highwood
Mountains, Meagher County Valleys and Upper Blackfoot and MacDonald
Pass. In north central Montana, Cascade County below 5000ft, Judith
Basin County and Judith Gap and Western and Central Chouteau
County. In southwest Montana, Gallatin Valley and Missouri
Headwaters.
* WHEN...From Friday evening through Saturday evening.
* IMPACTS...Heavy rainfall over the Horse Gulch and Burn Scars of
2026 is expected up to and during the period of the watch.
Residents near he Horse Gulch area and burn scars from the summer
of 2026 should prepare for potential debris flow. Be sure to stay
up to date with information from local authorities. Heavy rainfall
could trigger flash flooding of low-lying areas, urbanized street
flooding, and debris flows in and near recent wildfire burn scars.
* ADDITIONAL DETAILS...
- National Weather Service Meteorologists are forecasting heavy
rainfall over recent burn scars, which may lead to flash flooding
and debris flows.
- Some locations that may experience flash flooding include...
Areas near recent burn scars from the summer 2026 and the Horse
Gulch area.
- http://www.weather.gov/safety/flood
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Western and Central Chouteau County; Cascade County below 5000ft; Judith Basin County and Judith Gap; Upper Blackfoot and MacDonald Pass; Gates of the Moun |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-09-18T06:00:00-06:00 |
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 reportAlso reported by: WMO
This event as JSON · API and licence
Source updated 32 days ago (Sep 17, 2026 16:19 UTC) · we last heard from WMO Alert Hub (national weather services) 46 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: Western and Central Chouteau County; Cascade County below 5000ft; Judith Basin County and Judith Gap; Upper Blackfoot and MacDonald Pass; Gates of the Moun
Official authorities in United States
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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.
Nearby & related events
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.