A large and strong low pressure system moving inland through the Pacific Northwest directed plentiful Pacific moisture up and over the continental divide. The associated cold front and very unstable atmosphere combined to create severe thunderstorms in the Northern Rockies region which spread across northeast Montana during the afternoon and evening hours.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GGW wrote it up.
A large and strong low pressure system moving inland through the Pacific Northwest directed plentiful Pacific moisture up and over the continental divide. The associated cold front and very unstable atmosphere combined to create severe thunderstorms in the Northern Rockies region which spread across northeast Montana during the afternoon and evening hours.
The Glasgow radar (KGGW), 69 km away, was scanning. The volume nearest the first event began at 01:38 UTC.
3 thunderstorm wind. Local standard time, as filed.
Cooperative observer 4 NNE Content estimated 60 mph wind gusts.
Trained spotter 3 NNW Vandalia estimated 60 mph wind gusts.
The RAWS site POPM8, east of Poplar measured a 69 mph wind gust.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2019Every state in 2019This day in weather historyWarnings in Montana, June 2019
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 817557, 817558, 817559.