Flash Flood in Silver Bow County, Montana

Flash Flood August 6, 2009 · Silver Bow County, Montana

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

What the National Weather Service wrote

Heavy rain caused several Forest Service roads to be flooded.

The wider storm

A strong low pressure system and associated cold front moved into the Northern Rockies, creating a favorable environment for strong hail producing thunderstorms and heavy rain. Flash flooding was reported in the city of Butte with this event as up to an inch of precipitation occurred in 30 to 45 minutes. Hail up to the size of baseballs and strong winds nearing 70 mph were also observed.

Began near Maiden Rock (45.8100, -112.9400).

Source: NOAA Storm Events Database, event 192642. Narratives are written by the National Weather Service forecast office that issued the report.

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