Wyoming, 1999

Hail and Damaging Winds in Wyoming, August 11, 1999

August 11, 1999 · NWS UNR · 8 events in 2 counties and zones

5 hail, 2 thunderstorm wind, 1 funnel cloud, as filed by the National Weather Service.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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
$20,000
Crop damage
None recorded
Events
8

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 radar

The national radar mosaic for the moment the first event began.

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Event by event

5 hail, 2 thunderstorm wind, 1 funnel cloud. Local standard time, as filed.

Thunderstorm Wind, Campbell

When
August 11, 7:04 PM MST
Where
Campbell County, 12 mi S of Gillette
Measured
52 kt (60 mph)
Reported by
LAW ENFORCEMENT
Coordinates
44.120, -105.480

Hail, Campbell

When
August 11, 7:10 PM MST
Where
Campbell County, 15 mi SE of Belle Ayr
Measured
1.5 in hail
Reported by
TRAINED SPOTTER
Coordinates
43.950, -105.130

Funnel Cloud, Campbell

When
August 11, 7:24 PM MST
Where
Campbell County, 15 mi SSE of Gillette
Reported by
GENERAL PUBLIC
Coordinates
44.248, -105.548 (the zone’s center; the record gives no point)

Hail, Campbell

When
August 11, 7:45 PM MST
Where
Campbell County, 6 mi S of Rozet
Measured
1 in hail
Reported by
TRAINED SPOTTER
Coordinates
44.200, -105.200

Windows were broken at a spotters home.

Hail, Crook

When
August 11, 8:00 PM MST
Where
Crook County, Moorcroft
Measured
1.75 in hail
Property damage
$20,000
Reported by
LAW ENFORCEMENT
Coordinates
44.270, -104.950

Eighty houses had hail damage--mostly broken windows and damaged siding. Two police vehicles had moderate hail damage and another was totaled by hail.

Thunderstorm Wind, Crook

When
August 11, 8:00 PM MST
Where
Crook County, Moorcroft
Measured
52 kt (60 mph)
Reported by
LAW ENFORCEMENT
Coordinates
44.270, -104.950

Hail, Crook

When
August 11, 8:05 PM MST
Where
Crook County, 5 mi E of Moorcroft
Measured
2 in hail
Reported by
LAW ENFORCEMENT
Coordinates
44.270, -104.850

Hail, Crook

When
August 11, 8:16 PM MST
Where
Crook County, 15 mi E of Moorcroft
Measured
1.75 in hail
Reported by
LAW ENFORCEMENT
Coordinates
44.270, -104.650

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.
Funnel Cloud
A rotating column of cloud extending from a thunderstorm that did not reach the ground.

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

The same day elsewhere

More

Every storm in Wyoming in 1999Every state in 1999This day in weather historyWarnings in Wyoming, 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: 5719780, 5719781, 5719783, 5719782, 5719827, 5719828, 5719829, 5719830.