Enough instability and moisture was present in the local atmosphere to generate a few severe thunderstorms.
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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.
Enough instability and moisture was present in the local atmosphere to generate a few severe thunderstorms.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Glasgow, MT wrote its last area forecast discussion before the first event at Aug 5, 1:19 AM MST, 3 hours 56 minutes earlier.
Area Forecast Discussion National Weather Service Glasgow MT 219 AM MDT Tue Aug 5 2025 .DISCUSSION... KEY MESSAGES: 1) Scattered showers and thunderstorms are expected this morning into Tuesday. Isolated severe cells may be possible in the afternoon hours. 2) Wednesday will offer a pause with dry weather across the region. 3)A front arriving Thursday will bring cooler and unsettled weather through Friday and Saturday. WEATHER PATTERN OVERVIEW: Morning rain showers will move across the region early today. A marginal risk exists across the eastern half of the CWA this afternoon. 00Z run of the HREF suggest a couple longer track isolated cells starting around 3 to 4 PM and moving across the MT/ND boarder by 8PM with hail as the main threat. PWs of 1.09" to 1.4" suggest that heavy rain will also continue to be a threat with their passage. Wednesday will be a dry pause. Thursday a PCNW trough arrives with a front in the afternoon and again brings showers and thunderstorms on it. The cool core of the trough settles in Friday and hangs around through Saturday before exiting. This should bring temperatures down to below normal for about 48 hours. Ensembles then suggest zonal to northwest flow which could have a slight drying effect to take hold Sunday and last into mid next week though there are significant disagreements amongst the members. FORECAST CONFIDENCE & DEVIATIONS: NBM was followed this forecast cycle which captured expected trends well. Confidence is high for thunderstorms this evening and for seasonable temperatures over the next few days. Confidence is above average that cooler and more active weather will return late in the week into the upcoming weekend. COnfidence drops off quickly with the exit of the cool core trough and ensemble members disagree on how zonal or northwest conditions set up. GAH && .AVIATION... LAST UPDATED: 0730Z FLIGHT CAT RANGE: VFR. DISCUSSION: VFR through the cycle. Scattered showers and thunderstorms are expected through the morning and into this afternoon. Clearing is expected around 00Z and through the evening for the bulk of TAF sites. This clearing should remain through the night and into Wednesday morning. Some hit-and-miss storms may briefly produce reduced visibility down to IFR/MVFR if they pass directly over a taf site. WIND: E to SE at 5 to 15 kts this morning. Turning W behind a frontal passage early this afternoon. Gusty and shifting winds are possible near any storms. GAH && .GGW WATCHES/WARNINGS/ADVISORIES... None. && weather.gov/glasgow
The Billings radar (KBLX), 138 km away, was scanning. The volume nearest the first event began at 12:14 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Trained spotter reported trees swaying significantly and estimated wind gusts of 50 to 60 mph along with pea sized hail.
An NWS employee reported mainly nickel size hail and a few hail stones up to the size of quarters.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2025Every state in 2025This day in weather historyWarnings in Montana, August 2025
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 2026-09-24. Each event’s entry at NCEI: 1273314, 1273312.