A cluster of severe thunderstorms developed over eastern Custer and eastern Pennington Counties, then moved east-southeast across southern South Dakota. The storms produced large hail, wind gusts around 100 mph, and a weak tornado in Wall.

Hail in CUSTER, SOUTH DAKOTA
From 20-JUN-10 15:55:00 to 20-JUN-10 16:30:00 (MST-7)
Location: FOLSOM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A prolonged period of hail to quarter size covered the ground.

Hail in CUSTER, SOUTH DAKOTA
From 20-JUN-10 15:30:00 to 20-JUN-10 15:35:00 (MST-7)
Location: HERMOSA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 20-JUN-10 15:50:00 to 20-JUN-10 16:00:00 (MST-7)
Location: FARMINGDALE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 20-JUN-10 17:02:00 to 20-JUN-10 17:02:00 (MST-7)
Location: WALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 20-JUN-10 16:56:00 to 20-JUN-10 16:56:00 (MST-7)
Location: WALL MUNI ARPT
Magnitude: 87.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Strong thunderstorm winds destroyed a hangar at the Wall Municipal Airport and tossed three small airplanes several yards. One plane landed in a windbreak across Airport Road.

Hail in JACKSON, SOUTH DAKOTA
From 20-JUN-10 18:00:00 to 20-JUN-10 18:05:00 (MST-7)
Location: CEDAR PASS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 20-JUN-10 18:00:00 to 20-JUN-10 18:00:00 (MST-7)
Location: CEDAR PASS
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Strong winds and hail caused minor damage to automobiles.

Hail in JACKSON, SOUTH DAKOTA
From 20-JUN-10 18:25:00 to 20-JUN-10 18:30:00 (MST-7)
Location: BELVIDERE
Magnitude: 1.75 
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Public

Hail damaged automobiles and buildings in Belvidere.

Hail in MELLETTE, SOUTH DAKOTA
From 20-JUN-10 20:45:00 to 20-JUN-10 20:45:00 (CST-6)
Location: WHITE RIVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 20-JUN-10 15:50:00 to 20-JUN-10 15:50:00 (MST-7)
Location: FARMINGDALE
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Tornado in PENNINGTON, SOUTH DAKOTA
From 20-JUN-10 16:57:00 to 20-JUN-10 16:58:00 (MST-7)
Location: WALL MUNI ARPT
Tornado F-scale: EF0
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A weak tornado caused minor tree damage in a windbreak on the west side of Wall. Other trees were blown down across the north side of town and a travel trailer was blown over along Creighton Road on the east side of town.

Hail in JACKSON, SOUTH DAKOTA
From 20-JUN-10 17:35:00 to 20-JUN-10 17:35:00 (MST-7)
Location: CACTUS FLATS
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golfball sized hail caused minor damage to automobiles.