A long-lived supercell thunderstorm developed across far northern Campbell County and tracked eastward across northern Crook County and eventually into western South Dakota. Large hail and strong wind gusts damaged automobiles and homes.

Hail in CAMPBELL, WYOMING
From 12-AUG-10 16:55:00 to 12-AUG-10 16:55:00 (MST-7)
Location: ROCKYPOINT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CAMPBELL, WYOMING
From 12-AUG-10 15:55:00 to 12-AUG-10 15:55:00 (MST-7)
Location: RECLUSE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph at Spotted Horse.

Hail in CAMPBELL, WYOMING
From 12-AUG-10 16:00:00 to 12-AUG-10 16:00:00 (MST-7)
Location: RECLUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CAMPBELL, WYOMING
From 12-AUG-10 16:30:00 to 12-AUG-10 16:30:00 (MST-7)
Location: RECLUSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CAMPBELL, WYOMING
From 12-AUG-10 16:55:00 to 12-AUG-10 16:55:00 (MST-7)
Location: ROCKYPOINT
Magnitude: 61.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

The combination of hail and wind caused minor damage to an automobile.

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:07:00 to 12-AUG-10 17:07:00 (MST-7)
Location: NEW HAVEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated at 60 mph.

Hail in CROOK, WYOMING
From 12-AUG-10 17:15:00 to 12-AUG-10 17:15:00 (MST-7)
Location: NEW HAVEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The ground was covered by hail.

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:17:00 to 12-AUG-10 17:17:00 (MST-7)
Location: NEW HAVEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph in New Haven.

Hail in CROOK, WYOMING
From 12-AUG-10 17:17:00 to 12-AUG-10 17:17:00 (MST-7)
Location: NEW HAVEN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: HULETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail covered the ground. 1.25 inches of rain fell in 20 minutes.

Hail in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: HULETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: HULETT
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind-driven hail broke house windows.

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: NEW HAVEN
Magnitude: 70.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated around 80 mph tore shingles off a house and broke large tree branches.

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: HULETT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 65 mph.

Hail in CROOK, WYOMING
From 12-AUG-10 17:50:00 to 12-AUG-10 17:50:00 (MST-7)
Location: ALVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:50:00 to 12-AUG-10 17:50:00 (MST-7)
Location: ALVA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Hail in CROOK, WYOMING
From 12-AUG-10 18:05:00 to 12-AUG-10 18:05:00 (MST-7)
Location: COLONY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 18:05:00 to 12-AUG-10 18:05:00 (MST-7)
Location: COLONY
Magnitude: 61.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The combination of hail and wind broke windows of a house and automobile.

Hail in CROOK, WYOMING
From 12-AUG-10 17:30:00 to 12-AUG-10 17:30:00 (MST-7)
Location: NEW HAVEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CAMPBELL, WYOMING
From 12-AUG-10 16:42:00 to 12-AUG-10 16:42:00 (MST-7)
Location: ROCKYPOINT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in CROOK, WYOMING
From 12-AUG-10 17:15:00 to 12-AUG-10 17:15:00 (MST-7)
Location: NEW HAVEN
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Wind-driven hail punched holes in the siding and broke windows of a mobile home.