A supercell thunderstorm developed over northern Ziebach County and tracked southward across extreme eastern Meade County, extreme eastern Pennington County, and western Haakon County. The storm produced hail to the size of baseballs and eventually wind gusts as high as 70 mph.

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 14:50:00 to 30-JUN-12 14:50:00 (MST-7)
Location: GLAD VALLEY
Magnitude: 2.00 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 14:50:00 to 30-JUN-12 14:50:00 (MST-7)
Location: GLAD VALLEY
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 15:23:00 to 30-JUN-12 15:23:00 (MST-7)
Location: THUNDER BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 15:40:00 to 30-JUN-12 15:40:00 (MST-7)
Location: IRON LIGHTNING
Magnitude: 2.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 30-JUN-12 17:35:00 to 30-JUN-12 17:35:00 (MST-7)
Location: MILESVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 30-JUN-12 17:23:00 to 30-JUN-12 17:23:00 (MST-7)
Location: CREIGHTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 70 mph.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 30-JUN-12 18:26:00 to 30-JUN-12 18:26:00 (MST-7)
Location: QUINN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts were estimated at 60 mph along Interstate-90.

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 15:48:00 to 30-JUN-12 15:48:00 (MST-7)
Location: RED ELM
Magnitude: 2.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 15:48:00 to 30-JUN-12 15:48:00 (MST-7)
Location: RED ELM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated around 60 mph.

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 15:50:00 to 30-JUN-12 15:50:00 (MST-7)
Location: RED ELM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 60 mph.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 30-JUN-12 16:03:00 to 30-JUN-12 16:03:00 (MST-7)
Location: (D07)FAITH ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 16:05:00 to 30-JUN-12 16:05:00 (MST-7)
Location: RED ELM
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 16:05:00 to 30-JUN-12 16:05:00 (MST-7)
Location: RED ELM
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

The combination of hail and wind damaged a house and vehicles.

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 16:05:00 to 30-JUN-12 16:10:00 (MST-7)
Location: RED ELM
Magnitude: 2.00 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 30-JUN-12 16:05:00 to 30-JUN-12 16:05:00 (MST-7)
Location: FAITH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 16:10:00 to 30-JUN-12 16:10:00 (MST-7)
Location: RED ELM
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 30-JUN-12 16:45:00 to 30-JUN-12 16:45:00 (MST-7)
Location: MARCUS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 30-JUN-12 17:00:00 to 30-JUN-12 17:00:00 (MST-7)
Location: HOWES
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind-driven hail caused minor damage.

Hail in HAAKON, SOUTH DAKOTA
From 30-JUN-12 17:35:00 to 30-JUN-12 17:35:00 (MST-7)
Location: MILESVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HAAKON, SOUTH DAKOTA
From 30-JUN-12 18:14:00 to 30-JUN-12 18:14:00 (MST-7)
Location: PHILIP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 30-JUN-12 17:25:00 to 30-JUN-12 17:25:00 (MST-7)
Location: ELM SPRINGS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 30-JUN-12 16:19:00 to 30-JUN-12 16:19:00 (MST-7)
Location: RED SCAFFOLD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 70 mph.

Hail in MEADE, SOUTH DAKOTA
From 30-JUN-12 17:00:00 to 30-JUN-12 17:00:00 (MST-7)
Location: HOWES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter