Flash Flood — Granite, Montana

2013-08-09 · near New Chicago, Granite, Montana

Event narrative

A slow moving wet thunderstorm dumped at least 1 of rainfall in one hour just southeast of Drummond. A rancher experienced a 5 foot wall of fast moving water that moved down their driveway. The fast flowing water laden with pea-sized hail and mud severely damaged grain & alfalfa crops, irrigation sprinklers and a fence. They said it was the worst flooding in at least 20 years.

Wider weather episode

A wave of monsoon moisture tracked south to north across western Montana on August 9, 2013. Embedded multicellular thunderstorms produced very heavy rain with flash flooding reported near Drummond and gusty winds that brought tree damage to portions of the Bitterroot and Missoula Valleys.

View location on OpenStreetMap → (46.6209, -113.1115)

Source: NOAA Storm Events Database, event_id 472152. Narrative written by the NWS forecast office that issued the report.