A very unstable atmosphere was in place across south central and southeast South Dakota with around 2000 J/kg MLCAPE.  As a strong upper-level wave dropped from Montana into North Dakota, storms initiated after 1400CST along a pre-frontal surface trough across north central South Dakota.  As storms moved into an environment with deep-layer effective shear of 40 to 50 knots, the southernmost cells produced very large hail as well as a brief tornado near Burke later in the evening. Two people were injured when the garage they were moving cars into at the time of the storm was destroyed.

Tornado in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:25:00 to 06-AUG-19 21:33:00 (CST-6)
Location: BURKE
Tornado F-scale: EF1
Property damage: 7.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado developed and touched down in the heart of town near Washington and 7th streets, causing damage to several trees at the touchdown point.  Shortly after, the tornado severely damaged several structures while tracking south, including leveling several buildings at the lumber yard, destroying the civic center, and causing significant damage to the school.  The start of the school year was delayed by two weeks due to extent of the damage. Two people were (directly) injured by debris when a garage collapsed on them while moving vehicles to safety. Numerous power transmission poles and lines were removed by the tornado.  Around 2 miles south southeast of Burke, the tornado struck a residence causing severe damage to the roof.  Shortly thereafter, the tornado lifted before reaching the intersection of 295th Street and 345th Avenue after traveling a bit less than 4 miles.  The path width reached a maximum of 75 yards within the city of Burke. Up to 3000 trees were damaged by the tornado in and near Burke. Property damage costs are rough estimates.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:20:00 to 06-AUG-19 21:22:00 (CST-6)
Location: BURKE MUNI ARPT
Magnitude: 88.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Wooden power poles broken off by thunderstorm winds.  A large area of 80 to 100 mile per hour winds accompanied the tornadic development.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:22:00 to 06-AUG-19 21:24:00 (CST-6)
Location: GREGORY ARPT
Magnitude: 64.00 MG
Reported by: AWOS

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:30:00 to 06-AUG-19 21:32:00 (CST-6)
Location: BURKE
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Winds downed at least six large pine, spruce and cedar trees.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:30:00 to 06-AUG-19 21:32:00 (CST-6)
Location: BURKE
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous large branches were brought down on power transmission lines in the city of Burke.

Flash Flood in CHARLES MIX, SOUTH DAKOTA
From 06-AUG-19 21:16:00 to 06-AUG-19 23:30:00 (CST-6)
Location: PLATTE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous roads were under water to a depth of 2 to 3 feet to the south of State Highway 44.

Hail in BRULE, SOUTH DAKOTA
From 06-AUG-19 19:55:00 to 06-AUG-19 19:57:00 (CST-6)
Location: (9V9)CHAMBERLAIN ARP
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 06-AUG-19 19:57:00 to 06-AUG-19 19:59:00 (CST-6)
Location: (9V9)CHAMBERLAIN ARP
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 06-AUG-19 20:02:00 to 06-AUG-19 20:04:00 (CST-6)
Location: (9V9)CHAMBERLAIN ARP
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 06-AUG-19 20:28:00 to 06-AUG-19 20:30:00 (CST-6)
Location: BIJOU HILLS
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CHARLES MIX, SOUTH DAKOTA
From 06-AUG-19 20:42:00 to 06-AUG-19 20:43:00 (CST-6)
Location: ACADEMY
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in CHARLES MIX, SOUTH DAKOTA
From 06-AUG-19 20:50:00 to 06-AUG-19 20:51:00 (CST-6)
Location: PLATTE
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 06-AUG-19 20:54:00 to 06-AUG-19 20:55:00 (CST-6)
Location: (9V9)CHAMBERLAIN ARP
Magnitude: 1.75 
Reported by: COOP Observer

Hail size varied from nickel to golf ball size.

Hail in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:10:00 to 06-AUG-19 21:12:00 (CST-6)
Location: DIXON
Magnitude: 2.75 
Property damage: 5.00K
Reported by: Trained Spotter

Hail destroyed a car windshield and headlights.

Hail in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:24:00 to 06-AUG-19 21:28:00 (CST-6)
Location: LUCAS
Magnitude: 1.75 
Crop damage: 50.00K
Reported by: NWS Storm Survey

Significant crop damage caused by wind-driven hail.

Lightning in CHARLES MIX, SOUTH DAKOTA
From 06-AUG-19 20:35:00 to 06-AUG-19 20:35:00 (CST-6)
Location: GEDDES
Property damage: 0.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Lightning started a fire in an unharvested grain field. Rain extinguished the fire within 15 minutes after ignition.

Hail in GREGORY, SOUTH DAKOTA
From 06-AUG-19 22:18:00 to 06-AUG-19 22:20:00 (CST-6)
Location: CARLOCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:28:00 to 06-AUG-19 21:30:00 (CST-6)
Location: BURKE
Magnitude: 83.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A metal building was destroyed by strong thunderstorm winds.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 06-AUG-19 21:18:00 to 06-AUG-19 21:20:00 (CST-6)
Location: BURKE
Magnitude: 61.00 EG
Reported by: NWS Storm Survey

Thunderstorm winds flattened corn, laying to the southwest.