Flash Flood in Cascade County, Montana
Flash Flood July 31, 2025 · Cascade County, Montana
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
There was a report of 6 inches of flowing water in the street in northwest Great Falls. Garbage cans floating down the street. There was another report of water covering 15th Street North in Black Eagle. No specific damages or injuries were reported from the flooding.
The wider storm
An upper-level shortwave combined with monsoon moisture brought a few severe thunderstorms and localized areas of heavy rainfall to North-Central MT. This resulted in isolated large hail, flooding, and a landspout. A stationary storm developed directly over the Great Falls urban area; this produced heavy rainfall and flash flooding in the city, with one gauge reporting 2.25 inches of rain in an hour. Another thunderstorm produced heavy rainfall over the Horse Gulch burn scar, which caused flash flooding downstream.
Began near (gtf)great Falls Arpt (47.4644, -111.3504).
Source: NOAA Storm Events Database, event 1285049. Narratives are written by the National Weather Service forecast office that issued the report.
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