As a strong upper level wave pushed into the western Dakotas during the evening hours,  isolated supercellular storms developed across central South Dakota and moved through areas west of the James River.  With 2000-2500 J/kg of MLCAPE and deep layer shear of 35 to 45 knots, the isolated storms produced hail up to golf ball size.  Soon, an increasing amount of DCAPE of 1000-1250 J/kg and increase in 0-3 km shear with development of a strong low-level jet aided in the transition to enhanced linear structures, which then developed a series of mesovortices as the line moved into far eastern South Dakota, southwest Minnesota and northwest Iowa.  Several brief tornadoes developed with mesovortices in southwest Minnesota and northwest Iowa, along with areas of enhanced wind damage.

Thunderstorm Wind in MOODY, SOUTH DAKOTA
From 17-AUG-19 21:00:00 to 17-AUG-19 21:03:00 (CST-6)
Location: COLMAN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

Several large branches were snapped off trees.

Thunderstorm Wind in MOODY, SOUTH DAKOTA
From 17-AUG-19 21:10:00 to 17-AUG-19 21:13:00 (CST-6)
Location: FLANDREAU MUNI ARPT
Magnitude: 65.00 EG
Property damage: 100.00K
Reported by: Public

Thunderstorm outflow caused significant damage to farm outbuildings.

Thunderstorm Wind in AURORA, SOUTH DAKOTA
From 17-AUG-19 18:46:00 to 17-AUG-19 18:48:00 (CST-6)
Location: WHITE LAKE
Magnitude: 53.00 MG
Reported by: Mesonet

Thunderstorm Wind in AURORA, SOUTH DAKOTA
From 17-AUG-19 19:10:00 to 17-AUG-19 19:12:00 (CST-6)
Location: PLANKINTON
Magnitude: 56.00 MG
Reported by: Mesonet

Thunderstorm Wind in DAVISON, SOUTH DAKOTA
From 17-AUG-19 19:45:00 to 17-AUG-19 19:47:00 (CST-6)
Location: (MHE)MITCHELL ARPT
Magnitude: 53.00 MG
Reported by: ASOS

Thunderstorm Wind in MINER, SOUTH DAKOTA
From 17-AUG-19 20:25:00 to 17-AUG-19 20:27:00 (CST-6)
Location: CANOVA
Magnitude: 50.00 MG
Reported by: Mesonet

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 18:16:00 to 17-AUG-19 18:20:00 (CST-6)
Location: LAKE ANDES
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in BEADLE, SOUTH DAKOTA
From 17-AUG-19 18:17:00 to 17-AUG-19 18:19:00 (CST-6)
Location: WESSINGTON
Magnitude: 0.88 
Reported by: COOP Observer

Hail in BEADLE, SOUTH DAKOTA
From 17-AUG-19 18:19:00 to 17-AUG-19 18:22:00 (CST-6)
Location: WESSINGTON
Magnitude: 1.25 
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

A car was dented by falling and blowing hail.

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 18:30:00 to 17-AUG-19 18:32:00 (CST-6)
Location: LAKE ANDES
Magnitude: 2.00 
Reported by: Trained Spotter

Hail in BRULE, SOUTH DAKOTA
From 17-AUG-19 18:47:00 to 17-AUG-19 18:51:00 (CST-6)
Location: KIMBALL
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 18:52:00 to 17-AUG-19 18:54:00 (CST-6)
Location: LAKE ANDES
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 18:55:00 to 17-AUG-19 18:58:00 (CST-6)
Location: RAVINIA
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 18:53:00 to 17-AUG-19 18:56:00 (CST-6)
Location: RAVINIA
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 19:38:00 to 17-AUG-19 19:41:00 (CST-6)
Location: PLATTE
Magnitude: 1.25 
Reported by: Social Media

Hail in KINGSBURY, SOUTH DAKOTA
From 17-AUG-19 20:02:00 to 17-AUG-19 20:04:00 (CST-6)
Location: DE SMET MUNI ARPT
Magnitude: 0.75 
Reported by: Public

Hail in HUTCHINSON, SOUTH DAKOTA
From 17-AUG-19 21:16:00 to 17-AUG-19 21:18:00 (CST-6)
Location: TRIPP
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 17-AUG-19 20:43:00 to 17-AUG-19 20:45:00 (CST-6)
Location: HUNTIMER
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

Several large limbs were broken off trees.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 17-AUG-19 20:46:00 to 17-AUG-19 20:49:00 (CST-6)
Location: COLTON
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

Large limbs were snapped off pine trees about 15 to 20 feet above ground.

Thunderstorm Wind in LAKE, SOUTH DAKOTA
From 17-AUG-19 20:49:00 to 17-AUG-19 20:52:00 (CST-6)
Location: CHESTER
Magnitude: 56.00 EG
Reported by: NWS Storm Survey

Large limb was broken off a cottonwood tree.

Thunderstorm Wind in LAKE, SOUTH DAKOTA
From 17-AUG-19 20:50:00 to 17-AUG-19 20:52:00 (CST-6)
Location: CHESTER
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A large tree limb was broken off in a shelter belt.

Thunderstorm Wind in MOODY, SOUTH DAKOTA
From 17-AUG-19 20:53:00 to 17-AUG-19 20:56:00 (CST-6)
Location: COLMAN
Magnitude: 56.00 EG
Reported by: NWS Storm Survey

A small tree was snapped off at the base.

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 17:10:00 to 17-AUG-19 17:25:00 (CST-6)
Location: LAKE ANDES ARPT
Magnitude: 1.75 
Reported by: Public

Hail lasted for around 40 minutes, but was quarter size or larger for about 15 minutes of that time.

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 17:30:00 to 17-AUG-19 17:34:00 (CST-6)
Location: PICKSTOWN
Magnitude: 1.50 
Reported by: Social Media

Hail in GREGORY, SOUTH DAKOTA
From 17-AUG-19 18:14:00 to 17-AUG-19 18:18:00 (CST-6)
Location: DIXON
Magnitude: 1.50 
Reported by: Trained Spotter

Thunderstorm Wind in LAKE, SOUTH DAKOTA
From 17-AUG-19 20:53:00 to 17-AUG-19 20:55:00 (CST-6)
Location: MADISON
Magnitude: 51.00 MG
Reported by: ASOS

Hail in CHARLES MIX, SOUTH DAKOTA
From 17-AUG-19 17:28:00 to 17-AUG-19 17:29:00 (CST-6)
Location: PICKSTOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter