Hail and Damaging Winds in Montana, July 20, 1989

Name: Hail and Damaging Winds in Montana, July 20, 1989
Start: 1989-07-20T18:00
End: 1989-07-20T20:15
Location: Montana

July 20, 1989 · NWS GTF · 5 events in 4 counties and zones

3 thunderstorm wind, 2 hail, as filed by the National Weather Service.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 5

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.

Event by event

3 thunderstorm wind, 2 hail. Local standard time, as filed.

Hail, Flathead

When: July 20, 6:00 PM CST
Where: Flathead County
Measured: 0.75 in hail
Coordinates: 48.200, -114.320

Thunderstorm Wind, Deer Lodge

When: July 20, 6:00 PM CST
Where: Deer Lodge County
Coordinates: 46.130, -112.950

Thunderstorm Wind, Cascade

When: July 20, 7:07 PM CST
Where: Cascade County
Measured: 54 kt (62 mph)
Coordinates: 47.520, -111.300

Hail, Flathead

When: July 20, 8:00 PM CST
Where: Flathead County
Measured: 0.75 in hail
Coordinates: 48.500, -113.970

Thunderstorm Wind, Chouteau

When: July 20, 8:15 PM CST
Where: Chouteau County
Coordinates: 47.930, -110.500

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Montana in 1989 Every state in 1989 This day in weather history Warnings in Montana, July 1989

Sources

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: 10073703, 10073704, 10073705, 10073706, 10073707.