Thunderstorms with strong to severe winds affected mainly areas of Petroleum County during the late afternoon 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.
Thunderstorms with strong to severe winds affected mainly areas of Petroleum County during the late afternoon hours.
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 Jun 27, 1:29 PM MST, 2 hours 6 minutes earlier.
Area Forecast Discussion National Weather Service Glasgow MT 229 PM MDT Fri Jun 27 2025 .DISCUSSION... KEY MESSAGES: 1) Isolated to scattered showers and thunderstorms are possible again this afternoon and evening. 2) Lake Wind Advisory in effect for Saturday. 3) Increasing high pressure will bring calm, warm and dry weather conditions to the region this weekend. 4) Expect thunderstorms to return by the middle of next week with a more active weather pattern. WEATHER PATTERN OVERVIEW: Just enough instability and weak forcing for ascent is present to allow for some hit-or-miss thunderstorms this afternoon and evening. The main threat is severe wind gusts, but small hail, heavy rain, and frequent lightning are also possible. Most of this activity is expected to remain near and south of the Missouri River. Tonight through Saturday, some leftover light rain will move through a few locations, but are not expected to amount to much more than a passing sprinkle. Widespread gusty west winds up to 30 mph set up Saturday morning across the region. A Lake Wind Advisory has been issued for the hours of 8 AM to 9 PM on Saturday. Early next week, confidence continues to increase in a strengthening ridge of high pressure from the south, bringing plenty of sunshine and warming temperatures with no storms. Then, During the latter half of next week, the weather pattern turns more active with the return of thunderstorms thanks to a new low pressure system from the west. FORECAST CONFIDENCE & DEVIATIONS: Deviated from NBM to provide more details surrounding the expect thunderstorms and gusty winds today through tonight. Kept NBM for Day 3 and beyond. Forecast confidence is high for temperatures, and average for thunderstorm chances today through tonight. Average to low confidence in exact placement and timing of individual storm cells. && .AVIATION... Last Updated: June 27, 2025 at 2028Z. Flight Category: Mainly VFR. Discussion: Partly to mostly cloudy skies are expected today, though isolated showers and thunderstorms should remain mostly away from area terminals through at least the afternoon. A stray shower or thunderstorm might approach the TAF sites beginning at 22Z this afternoon. Winds: From the west or northwest at 10 to 15 kts this afternoon and evening. Winds could become erratic and gusty near the stronger storms. && .GGW WATCHES/WARNINGS/ADVISORIES... Lake Wind Advisory from 8 AM to 9 PM MDT Saturday for Central and Southeast Phillips-Central and Southern Valley-Garfield- McCone-Petroleum. && weather.gov/glasgow
The Billings radar (KBLX), 144 km away, was scanning. The volume nearest the first event began at 22:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
The War Horse NW site (Montana Climate Office) recorded a wind gust of 62 mph.
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, June 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: 1262375.