Flash Flood — Granite, Montana

2013-08-09 · near (3du)drummond, Granite, Montana

$500

Property damage

Event narrative

A slow moving thunderstorm produced over an inch of rain in less than one hour during the evening of August 9, 2013 over the terrain southeast of Drummond, Montana. This triggered a flash flood up to four feet high that moved from small hillside gulches located north of Interstate 90 over the highway. One vehicle slid off the road and I-90 was shut down for a period of time until the water levels subsided.

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 → (46.6552, -113.1235)

Source: NOAA Storm Events Database, event_id 473040. Narrative written by the NWS forecast office that issued the report.