A moist and unstable air mass, combined with an approaching disturbance and favorable winds from the west to allow one severe thunderstorm to sneak into Roosevelt 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 GGW wrote it up.
A moist and unstable air mass, combined with an approaching disturbance and favorable winds from the west to allow one severe thunderstorm to sneak into Roosevelt County.
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 Jul 5, 1:23 PM MST, 1 hour 33 minutes earlier.
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</html>The Glasgow radar (KGGW), 156 km away, was scanning. The volume nearest the first event began at 21:55 UTC.
1 hail. Local standard time, as filed.
Trained spotter, via Facebook, reported plentiful hail up to the size of half dollars.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2020Every state in 2020This day in weather historyWarnings in Montana, July 2020
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: 904947.