A complex of thunderstorms that began on the evening of June 7th across southeastern North Dakota back-built to the west through the night and then to the southwest through the day on June 8th. This complex impacted north central South Dakota by the early evening on the 8th, leading to flash flooding, severe hail and wind, and a tornado. A favorable environment enabled these storms to produce measured wind gusts generally of 60 to 70 mph, though one report near Bullhead exceeded 90 mph. Rainfall amounts across central Corson County ranged from 3 to over 10 inches.

Hail in DEWEY, SOUTH DAKOTA
From 08-JUN-21 15:18:00 to 08-JUN-21 15:18:00 (MST-7)
Location: FIRESTEEL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DEWEY, SOUTH DAKOTA
From 08-JUN-21 16:00:00 to 08-JUN-21 16:00:00 (MST-7)
Location: FIRESTEEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in CORSON, SOUTH DAKOTA
From 08-JUN-21 17:18:00 to 08-JUN-21 17:19:00 (MST-7)
Location: LITTLE EAGLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado touched down and tracked northeast briefly in eastern Corson County. No damage was reported.

Hail in DEWEY, SOUTH DAKOTA
From 08-JUN-21 17:49:00 to 08-JUN-21 17:49:00 (MST-7)
Location: TIMBER LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 08-JUN-21 14:05:00 to 08-JUN-21 14:05:00 (MST-7)
Location: MC INTOSH
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 08-JUN-21 16:40:00 to 08-JUN-21 16:40:00 (MST-7)
Location: BULLHEAD
Magnitude: 82.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 08-JUN-21 17:19:00 to 08-JUN-21 17:19:00 (MST-7)
Location: TIMBER LAKE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Flash Flood in CORSON, SOUTH DAKOTA
From 08-JUN-21 17:44:00 to 08-JUN-21 20:45:00 (MST-7)
Location: BLACK HORSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorms produced very heavy rains of up to 10.35 inches 4 miles north of Firesteel in central Corson County during the evening hours of June 8th. As a result, water ran over a county road, stock dams were overtopped and planted fields were completely washed out. Several reports of flooded basements were also documented.

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 08-JUN-21 17:39:00 to 08-JUN-21 17:39:00 (MST-7)
Location: TIMBER LAKE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 08-JUN-21 17:54:00 to 08-JUN-21 17:54:00 (MST-7)
Location: TIMBER LAKE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 08-JUN-21 18:39:00 to 08-JUN-21 18:39:00 (MST-7)
Location: BEAR CREEK
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CORSON, SOUTH DAKOTA
From 08-JUN-21 16:20:00 to 08-JUN-21 16:20:00 (MST-7)
Location: BLACK HORSE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Small tree limbs were downed by estimated sixty mph winds.