Storms developing along a nearly stationary frontal boundary through central South Dakota and Nebraska organized into a line by late evening.  The environment with extreme mid-level instability (greater than 9 degrees C/km) and 1200-1500 J/kg DCAPE helped to enhance damaging wind gusts across southeast South Dakota into northwest Iowa.

Thunderstorm Wind in JERAULD, SOUTH DAKOTA
From 08-AUG-20 23:57:00 to 08-AUG-20 23:59:00 (CST-6)
Location: WESSINGTON SPGS
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 2.00K
Reported by: Public

Several large trees were uprooted or snapped, with other damage to a sunflower field. Property damage costs are rough estimates. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in CHARLES MIX, SOUTH DAKOTA
From 08-AUG-20 22:55:00 to 08-AUG-20 22:59:00 (CST-6)
Location: ACADEMY
Magnitude: 52.00 MG
Reported by: Mesonet

South Dakota RWIS site SD554 measured a peak wind gust of 60 mph.

Thunderstorm Wind in MCCOOK, SOUTH DAKOTA
From 09-AUG-20 00:32:00 to 09-AUG-20 00:35:00 (CST-6)
Location: CANISTOTA
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

Lids were ripped off grain bins, with large tree branches down. Property damage costs are rough estimates.

Thunderstorm Wind in AURORA, SOUTH DAKOTA
From 08-AUG-20 23:39:00 to 08-AUG-20 23:41:00 (CST-6)
Location: STICKNEY
Magnitude: 59.00 MG
Reported by: Mesonet

Personal weather station KSDPLANK3 measured a peak wind gust of 68 mph.

Thunderstorm Wind in AURORA, SOUTH DAKOTA
From 08-AUG-20 23:41:00 to 08-AUG-20 23:44:00 (CST-6)
Location: WHITE LAKE
Magnitude: 52.00 MG
Reported by: Mesonet

Personal weather station KSDWESSI5 measured a peak wind gust of 60 mph.

Thunderstorm Wind in DAVISON, SOUTH DAKOTA
From 08-AUG-20 23:59:00 to 09-AUG-20 00:02:00 (CST-6)
Location: MITCHELL
Magnitude: 63.00 MG
Reported by: Mesonet

Personal weather station KSDMITCH21 measured a peak wind gust of 72 mph.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 08-AUG-20 23:14:00 to 08-AUG-20 23:17:00 (CST-6)
Location: FT RANDALL
Magnitude: 52.00 MG
Reported by: Mesonet

South Dakota RWIS site SD588 measured a peak wind of 60 mph.

Thunderstorm Wind in BRULE, SOUTH DAKOTA
From 08-AUG-20 23:15:00 to 08-AUG-20 23:17:00 (CST-6)
Location: (9V9)CHAMBERLAIN ARP
Magnitude: 58.00 MG
Reported by: ASOS

Automated weather station K9V9 measured a peak wind gust of 67 mph.

Thunderstorm Wind in BRULE, SOUTH DAKOTA
From 08-AUG-20 23:24:00 to 08-AUG-20 23:27:00 (CST-6)
Location: KIMBALL
Magnitude: 50.00 MG
Reported by: Mesonet

South Dakota RWIS site SD537 measured a peak wind gust of 58 mph.

Thunderstorm Wind in HANSON, SOUTH DAKOTA
From 09-AUG-20 00:04:00 to 09-AUG-20 00:07:00 (CST-6)
Location: ALEXANDRIA
Magnitude: 56.00 MG
Reported by: Storm Chaser

Thunderstorm wind gust to 65 mph measured by hand-held anemometer.

Thunderstorm Wind in SANBORN, SOUTH DAKOTA
From 09-AUG-20 00:10:00 to 09-AUG-20 00:13:00 (CST-6)
Location: FORESTBURG
Magnitude: 52.00 MG
Reported by: Mesonet

South Dakota RWIS station SD527 measured a peak wind gust of 60 mph.

Thunderstorm Wind in DOUGLAS, SOUTH DAKOTA
From 08-AUG-20 23:28:00 to 08-AUG-20 23:30:00 (CST-6)
Location: ARMOUR
Magnitude: 61.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds damaged several farm outbuildings. Property damage costs are rough estimates.

Thunderstorm Wind in JERAULD, SOUTH DAKOTA
From 08-AUG-20 23:57:00 to 09-AUG-20 00:00:00 (CST-6)
Location: WESSINGTON SPGS
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: Public

Branches were downed by thunderstorm winds and blown across the street. Property damage costs are rough estimates.

Thunderstorm Wind in BON HOMME, SOUTH DAKOTA
From 09-AUG-20 00:05:00 to 09-AUG-20 00:08:00 (CST-6)
Location: TYNDALL
Magnitude: 50.00 MG
Crop damage: 1.00K
Reported by: Mesonet

South Dakota RWIS gage SD571 measured a peak wind gust of 58 mph. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.