Heavy Rain in Missoula County, Montana

Heavy Rain August 4, 2025 · Missoula County, Montana

$5K

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

A public report described torrential rain of approximately 20 minutes in duration and roadway ponding near Bernice's Bakery around 1600MST; additionally, the roof of new annex started leaking.

The wider storm

An anomalously moist airmass, with precipitable water values between 0.8 and 1.0+ inches, was established across the region. A passing shortwave trough provided large-scale lift, triggering widespread thunderstorms with very high rainfall rates. The overall environment supported training convection, where multiple storms repeatedly moved over the same areas. These conditions were highly favorable for producing excessive rainfall and initiating flash flooding.

Began near Missoula (46.8707, -113.9884).

Source: NOAA Storm Events Database, event 1282019. Narratives are written by the National Weather Service forecast office that issued the report.

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