A line of thunderstorms developed over far northeastern Wyoming and became severe as it moved into western South Dakota. The line remained together through much of northwestern and west central South Dakota. Hail accompanied the stronger cells within the line, but strong wind gusts were the main threats with the storms.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:50:00 to 08-JUN-21 19:50:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

A pole barn was damaged by the wind.

Hail in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:56:00 to 08-JUN-21 19:56:00 (MST-7)
Location: (RAP)RAPID CITY ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 08-JUN-21 19:45:00 to 08-JUN-21 19:45:00 (MST-7)
Location: CASTLE ROCK
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 08-JUN-21 19:55:00 to 08-JUN-21 19:55:00 (MST-7)
Location: ELLSWORTH AFB
Magnitude: 58.00 MG
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MEADE, SOUTH DAKOTA
From 08-JUN-21 20:04:00 to 08-JUN-21 20:04:00 (MST-7)
Location: ELLSWORTH AFB
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 21:09:00 to 08-JUN-21 21:09:00 (MST-7)
Location: NEW UNDERWOOD
Magnitude: 53.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PERKINS, SOUTH DAKOTA
From 08-JUN-21 21:19:00 to 08-JUN-21 21:19:00 (MST-7)
Location: MEADOW
Magnitude: 52.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 08-JUN-21 20:51:00 to 08-JUN-21 20:51:00 (MST-7)
Location: LUDLOW
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 22:20:00 to 08-JUN-21 22:20:00 (MST-7)
Location: WALL
Magnitude: 51.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 08-JUN-21 19:05:00 to 08-JUN-21 19:25:00 (MST-7)
Location: BELLE FOURCHE AIRPORT
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 08-JUN-21 21:54:00 to 08-JUN-21 21:54:00 (MST-7)
Location: RED ELM
Magnitude: 56.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PERKINS, SOUTH DAKOTA
From 08-JUN-21 21:54:00 to 08-JUN-21 21:54:00 (MST-7)
Location: MEADOW
Magnitude: 56.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 08-JUN-21 22:24:00 to 08-JUN-21 22:34:00 (MST-7)
Location: CACTUS FLATS
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LAWRENCE, SOUTH DAKOTA
From 08-JUN-21 19:15:00 to 08-JUN-21 19:15:00 (MST-7)
Location: WHITEWOOD
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Marble sized hail also accompanied the storm.

Hail in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:45:00 to 08-JUN-21 19:55:00 (MST-7)
Location: RAPID CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:45:00 to 08-JUN-21 19:50:00 (MST-7)
Location: RAPID CITY
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Official NWS Observations

Hail in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:51:00 to 08-JUN-21 19:51:00 (MST-7)
Location: RAPID CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 19:49:00 to 08-JUN-21 19:49:00 (MST-7)
Location: RAPID CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CUSTER, SOUTH DAKOTA
From 08-JUN-21 19:55:00 to 08-JUN-21 19:55:00 (MST-7)
Location: HERMOSA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Time estimated from radar.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 21:39:00 to 08-JUN-21 21:50:00 (MST-7)
Location: WASTA
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 21:19:00 to 08-JUN-21 21:19:00 (MST-7)
Location: WASTA
Magnitude: 53.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Hail in MEADE, SOUTH DAKOTA
From 08-JUN-21 19:39:00 to 08-JUN-21 19:39:00 (MST-7)
Location: PIEDMONT
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 08-JUN-21 21:45:00 to 08-JUN-21 21:45:00 (MST-7)
Location: WALL
Magnitude: 51.00 MG
Crop damage: 0.00K
Reported by: RAWS