Severe thunderstorms developed near a surface low pressure area and dryline in central South Dakota during the late afternoon and evening hours. Very large hail up to three inches in diameter, damaging winds to seventy mph, along with a couple tornadoes occurred in central and north central South Dakota.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 23-AUG-18 18:35:00 to 23-AUG-18 18:35:00 (CST-6)
Location: MC CLURE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in POTTER, SOUTH DAKOTA
From 23-AUG-18 16:31:00 to 23-AUG-18 16:31:00 (CST-6)
Location: LEBANON
Magnitude: 1.75 
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 23-AUG-18 17:01:00 to 23-AUG-18 17:01:00 (CST-6)
Location: LOWRY
Magnitude: 1.75 
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 23-AUG-18 17:03:00 to 23-AUG-18 17:03:00 (CST-6)
Location: LOWRY
Magnitude: 3.00 
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 23-AUG-18 17:00:00 to 23-AUG-18 17:00:00 (MST-7)
Location: MC INTOSH
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 23-AUG-18 17:16:00 to 23-AUG-18 17:16:00 (MST-7)
Location: WALKER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in HYDE, SOUTH DAKOTA
From 23-AUG-18 17:27:00 to 23-AUG-18 17:33:00 (CST-6)
Location: HIGHMORE ARPT
Tornado F-scale: EF0
Reported by: NWS Storm Survey

Based off spotter photos and high resolution satellite imagery, the tornado tracked for over a half mile through a center pivot farm field around 19 miles north of Highmore.

Hail in HAND, SOUTH DAKOTA
From 23-AUG-18 18:45:00 to 23-AUG-18 18:45:00 (CST-6)
Location: POLO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HAND, SOUTH DAKOTA
From 23-AUG-18 18:47:00 to 23-AUG-18 18:47:00 (CST-6)
Location: POLO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 23-AUG-18 17:47:00 to 23-AUG-18 17:47:00 (CST-6)
Location: MURDO MUNI ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 23-AUG-18 17:51:00 to 23-AUG-18 17:51:00 (CST-6)
Location: MURDO MUNI ARPT
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 23-AUG-18 18:43:00 to 23-AUG-18 18:43:00 (CST-6)
Location: PRESHO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Tornado in HYDE, SOUTH DAKOTA
From 23-AUG-18 17:14:00 to 23-AUG-18 17:23:00 (CST-6)
Location: HOLABIRD
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The tornado started on the west side of a ranch and threw a 4-wheeler into a barn. There was additional damage to trees and the roof of a barn at the ranch. The tornado moved across an open field and damaged a calf shed. It then crossed 180th street and 331st avenue and moved through a corn field. Many corn stalks were flattened in a 50 yard wide path before entering an open field and then crossing a hay field destroying a hay bale before dissipating.