Headline:
Flash Flood Watch issued September 18 at 3:21AM MDT until September 20 at 12:00AM MDT by NWS Great Falls MT
Event:
Flash Flood Watch
Urgency:
Future
Effective:
September 18, 2026 - 2:21am
Expires:
September 18, 2026 - 2:15pm
Description:
* 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 and southwest Montana, including the
following areas, in central Montana, Big Belt, Bridger and Castle
Mountains, Elkhorn and Boulder Mountains and Little Belt and
Highwood Mountains. In southwest Montana, Gallatin Valley.
* WHEN...From this 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
Instruction:
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
Area Description:
Little Belt and Highwood Mountains; Big Belt, Bridger and Castle Mountains; Elkhorn and Boulder Mountains; Gallatin Valley
Forcast Office:
NWS Great Falls MT
Sender:
w-nws.webmaster@noaa.gov