Hail, Stillwater
- When
- August 20, 3:00 PM CST
- Where
- Stillwater County
- Measured
- 1.25 in hail
- Coordinates
- 45.500, -109.430
Hail and Damaging Winds in Montana, August 20, 1990
6 hail, 3 thunderstorm wind, 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 9
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
6 hail, 3 thunderstorm wind. Local standard time, as filed.
Hail, Cascade
- When
- August 20, 4:20 PM CST
- Where
- Cascade County
- Measured
- 1 in hail
- Coordinates
- 46.920, -110.700
Hail, Cascade
- When
- August 20, 4:25 PM CST
- Where
- Cascade County
- Measured
- 1.5 in hail
- Coordinates
- 47.100, -110.850
Hail, Flathead
- When
- August 20, 5:00 PM CST
- Where
- Flathead County
- Measured
- 1 in hail
- Coordinates
- 48.020, -114.220
Thunderstorm Wind, Yellowstone
- When
- August 20, 5:04 PM CST
- Where
- Yellowstone County
- Coordinates
- 45.800, -108.480
Thunderstorm Wind, Flathead
- When
- August 20, 5:25 PM CST
- Where
- Flathead County
- Measured
- 57 kt (66 mph)
- Coordinates
- 48.070, -114.070
Thunderstorm Wind, Flathead
- When
- August 20, 5:28 PM CST
- Where
- Flathead County
- Measured
- 60 kt (69 mph)
- Coordinates
- 48.200, -114.320
Hail, Flathead
- When
- August 20, 5:35 PM CST
- Where
- Flathead County
- Measured
- 1 in hail
- Coordinates
- 48.420, -114.330
Hail, Lewis and Clark
- When
- August 20, 11:04 PM CST
- Where
- Lewis and Clark County
- Measured
- 1.25 in hail
- Coordinates
- 46.580, -112.030
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
- Tornadoes and Hail in Indiana, August 20, 1990
- Hail and Damaging Winds in Alabama, August 20, 1990
- Damaging Winds in Arkansas, August 20, 1990
- Damaging Winds in North Carolina, August 20, 1990
- Hail and Damaging Winds in Tennessee, August 20, 1990
- Hail and Damaging Wind in Texas, August 20, 1990
- Hail and Damaging Winds in Oklahoma, August 20, 1990
- Damaging Winds in South Carolina, August 20, 1990
- Hail and Damaging Wind in Idaho, August 20, 1990
- Damaging Winds in Kentucky, August 20, 1990
- Hail in New Mexico, August 20, 1990
- Damaging Wind in Georgia, August 20, 1990
More
Every storm in Montana in 1990Every state in 1990This day in weather historyWarnings in Montana, August 1990
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: 10070402, 10070403, 10070404, 10070405, 10070406, 10071265, 10071266, 10071478, 10071479.