Hail and Damaging Wind in Montana, August 7, 1999

Name: Hail and Damaging Wind in Montana, August 7, 1999
Start: 1999-08-07T17:47
End: 1999-08-07T18:47
Location: Montana

August 7, 1999 · NWS MSO · 2 events in 1 county or zone

Numerous trees fell and where uprooted at North Shore campground near Trout Creek Ranger Station.

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: 2

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.

What happened

The episode as NWS MSO wrote it up.

1.75 inch hail west of Thompson Falls reported by Sherriff.One resident observed hail stones larger than a half dollar in the Crow Creek area.Damage to several vehicles with power lines down.Numerous trees fell and where uprooted at North Shore campground near Trout Creek Ranger Station.

The radar

The Missoula radar (KMSX), 120 km away, was scanning. The volume nearest the first event began at 00:47 UTC.

Open the radar archive at this moment

Event by event

1 thunderstorm wind, 1 hail. Local standard time, as filed.

Thunderstorm Wind, Sanders

When: August 7, 5:47 PM MST to 6:47 PM MST
Where: Sanders County, Thompson Falls to Trout Creek
Measured: 63 kt (72 mph)
Reported by: EMERGENCY MANAGER
Coordinates: 47.600, -115.350

Hail, Sanders

When: August 7, 5:47 PM MST to 6:47 PM MST
Where: Sanders County, Thompson Falls to Trout Creek
Measured: 1.75 in hail
Reported by: LAW ENFORCEMENT
Coordinates: 47.600, -115.350

What these are

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.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.

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

The same day elsewhere

Every storm in Montana in 1999 Every state in 1999 This day in weather history Warnings in Montana, August 1999

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: 5716405, 5716406.