A supercell thunderstorm developed along the northeastern slopes of the Black Hills and moved southeast across the Rapid City area and onto the plains southeast of the city. Large hail to near tennis ball size fell across southwestern and southern parts of Rapid City, while hail almost to softball size fell near Hart Ranch and the Black Gap subdivision just south of the city limits, causing extensive damage. The storm weakened as it moved into eastern Custer County and northwestern Shannon County. Heavy rain also caused some minor street flooding in the Rapid City area.

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:28:00 to 03-AUG-07 18:38:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:28:00 to 03-AUG-07 18:28:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:36:00 to 03-AUG-07 18:45:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 19:10:00 to 03-AUG-07 19:10:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:50:00 to 03-AUG-07 19:00:00 (MST-7)
Location: RAPID CITY
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:25:00 to 03-AUG-07 18:25:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 03-AUG-07 19:50:00 to 03-AUG-07 20:00:00 (MST-7)
Location: FAIRBURN
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The combination of hail and wind broke windows on the west side of a house. A roof was blown off a shed.

Hail in CUSTER, SOUTH DAKOTA
From 03-AUG-07 19:50:00 to 03-AUG-07 20:00:00 (MST-7)
Location: FAIRBURN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CUSTER, SOUTH DAKOTA
From 03-AUG-07 19:30:00 to 03-AUG-07 19:30:00 (MST-7)
Location: FAIRBURN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:40:00 to 03-AUG-07 18:40:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.50 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail damaged automobiles near the intersection of South Highway 16 and Catron Boulevard.

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:45:00 to 03-AUG-07 18:45:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.50 
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Two house windows were broken by large hail.

Hail in PENNINGTON, SOUTH DAKOTA
From 03-AUG-07 18:44:00 to 03-AUG-07 18:50:00 (MST-7)
Location: RAPID CITY
Magnitude: 4.25 
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail to softball size broke windows and damaged roofs in the Black Gap subdivision. It also damaged vehicles and at least 70 motor homes at the Hart Ranch campgound.