Severe Flood ● Closed
Flood Watch issued September 18 at 10:39AM MDT until September 19 at 6:00PM MDT by NWS Great Falls MT, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
* WHAT...Flooding caused by excessive rainfall is possible.
* WHERE...The Canyon Ferry Area, Helena Valley, and Meagher County
Valleys in Central Montana
* WHEN...From 6 PM MDT this evening through Saturday afternoon.
* IMPACTS...Excessive runoff may result in flooding of low-lying and
flood-prone locations.
* ADDITIONAL DETAILS...
- Showers and thunderstorms capable of producing hourly rainfall
rates of between 0.25 inch to 0.5 inch are possible.
- Some locations impacted include Helena, Townsend, and White
Sulphur Springs
- http://www.weather.gov/safety/flood
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | Helena Valley; Meagher County Valleys; Canyon Ferry Area |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-09-19T06:00:00-06:00 |
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 WMO WMO WMO WMO
This event as JSON · API and licence
Source updated 31 days ago (Sep 18, 2026 16:40 UTC) · we last heard from WMO Alert Hub (national weather services) 44 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: Helena Valley; Meagher County Valleys; Canyon Ferry Area
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.
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.