A long-lived supercell thunderstorm tracked east-southeast from Wyoming across parts of the northern Black Hills and west central South Dakota, including the Rapid City area. The storm produced hail as large as baseball size as it moved through Rapid City, with gusty winds as well. Significant damage to vehicles and property occurred in western and southern portions of Rapid City. The storm also produced a tornado over the northern Black Hills, where it snapped and uprooted large Ponderosa pine trees.

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:45:00 to 06-JUL-20 19:00:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Official NWS Observations

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 06-JUL-20 18:25:00 to 06-JUL-20 18:25:00 (MST-7)
Location: STURGIS
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Hail in LAWRENCE, SOUTH DAKOTA
From 06-JUL-20 18:13:00 to 06-JUL-20 18:13:00 (MST-7)
Location: NEMO
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:30:00 to 06-JUL-20 18:30:00 (MST-7)
Location: JOHNSON SIDING
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:30:00 to 06-JUL-20 18:30:00 (MST-7)
Location: JOHNSON SIDING
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:30:00 to 06-JUL-20 18:30:00 (MST-7)
Location: HISEGA
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:35:00 to 06-JUL-20 18:40:00 (MST-7)
Location: HISEGA
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:38:00 to 06-JUL-20 18:38:00 (MST-7)
Location: JOHNSON SIDING
Magnitude: 2.75 
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:44:00 to 06-JUL-20 18:44:00 (MST-7)
Location: ROCKERVILLE
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:40:00 to 06-JUL-20 18:50:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:45:00 to 06-JUL-20 18:50:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: NWS Employee

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:48:00 to 06-JUL-20 18:48:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:49:00 to 06-JUL-20 18:49:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.50 
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:51:00 to 06-JUL-20 18:51:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: NWS Employee

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:51:00 to 06-JUL-20 18:51:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: NWS Employee

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:55:00 to 06-JUL-20 19:02:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: NWS Employee

Winds also gusted to 50 mph.

Hail in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 18:55:00 to 06-JUL-20 18:55:00 (MST-7)
Location: ROCKERVILLE
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CUSTER, SOUTH DAKOTA
From 06-JUL-20 19:30:00 to 06-JUL-20 19:30:00 (MST-7)
Location: FOLSOM
Magnitude: 2.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OGLALA LAKOTA, SOUTH DAKOTA
From 06-JUL-20 20:25:00 to 06-JUL-20 20:25:00 (MST-7)
Location: ROCKYFORD
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 06-JUL-20 20:25:00 to 06-JUL-20 20:25:00 (MST-7)
Location: SCENIC
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Tornado in LAWRENCE, SOUTH DAKOTA
From 06-JUL-20 17:44:00 to 06-JUL-20 17:58:00 (MST-7)
Location: ONEILL PASS
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado moved eastward from Wyoming over the Black Hills southwest of Lead for a total length of 7.4 miles. It tracked over forested and open terrain. Many trees were downed and snapped along its path, but no property damage was noted.