Montana, 1991

Hail in Montana, May 20, 1991

May 20, 1991 · NWS BIL · 5 events in 5 counties and zones

5 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

Open the live radar over this ground

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

5 hail. Local standard time, as filed.

Hail, Yellowstone

When
May 20, 12:10 AM CST
Where
Yellowstone County
Measured
3 in hail
Coordinates
45.950, -108.350

Hail, Stillwater

When
May 20, 3:00 PM CST
Where
Stillwater County
Measured
1.75 in hail
Coordinates
45.450, -109.820

Hail, Sweet Grass

When
May 20, 3:00 PM CST
Where
Sweet Grass County
Measured
1.5 in hail
Coordinates
45.920, -109.950

Hail, Chouteau

When
May 20, 4:30 PM CST
Where
Chouteau County
Measured
1.75 in hail
Coordinates
47.700, -110.480

Hail, Golden Valley

When
May 20, 5:00 PM CST
Where
Golden Valley County
Measured
1.75 in hail
Coordinates
46.300, -109.350

What these are

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

More

Every storm in Montana in 1991Every state in 1991This day in weather historyWarnings in Montana, May 1991

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: 10071492, 10071493, 10071494, 10071495, 10071496.