A moist and unstable airmass produced numerous thunderstorms during the afternoon hours. A severe thunderstorm developed over Teton County.
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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 TFX wrote it up.
A moist and unstable airmass produced numerous thunderstorms during the afternoon hours. A severe thunderstorm developed over Teton County. Hail the size of golf balls as well as heavy rain was reported.
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 Great Falls, MT wrote its last area forecast discussion before the first event at Jul 26, 1:51 PM MST, 52 minutes earlier.
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</html>The Great Falls radar (KTFX), 81 km away, was scanning. The volume nearest the first event began at 21:45 UTC.
1 hail. Local standard time, as filed.
A severe thunderstorm dropped 1.75 inch diameter hail at Choteau 9WSW. Windows were reported broken at several homes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2009Every state in 2009This day in weather historyWarnings in Montana, July 2009
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 2026-10-01. Each event’s entry at NCEI: 175770.