Severe thunderstorms developed in western South Dakota during the evening of the 27th before traveling east across all of South Dakota into the early morning hours on the 28th. As the storms became more organized they produced strong straight-line winds as well as brief tornados. Numerous reports of straight-line winds over 70 mph were documented along with a peak wind gust of 104 mph. Six tornados also occurred in total. The severe winds along with the tornados damaged trees, buildings, campers, and crops.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:22:00 to 28-AUG-20 01:22:00 (CST-6)
Location: ASTORIA
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated eighty mph winds knocked down several trees along with downing many tree branches.

Thunderstorm Wind in GRANT, SOUTH DAKOTA
From 28-AUG-20 02:15:00 to 28-AUG-20 02:15:00 (CST-6)
Location: BIG STONE CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated sixty mph winds brought down several large tree limbs.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 20:55:00 to 27-AUG-20 20:55:00 (MST-7)
Location: HAYES
Magnitude: 68.00 MG
Reported by: Public

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 20:58:00 to 27-AUG-20 20:58:00 (MST-7)
Location: HAYES
Magnitude: 70.00 MG
Reported by: Public

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:00:00 to 27-AUG-20 21:00:00 (MST-7)
Location: BUNKER
Magnitude: 84.00 MG
Reported by: Public

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:00:00 to 27-AUG-20 21:00:00 (MST-7)
Location: HAYES HAMILTON ARPT
Magnitude: 59.00 MG
Reported by: Mesonet

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:01:00 to 27-AUG-20 21:01:00 (MST-7)
Location: HAYES AIRSTRIP
Magnitude: 90.00 MG
Reported by: Mesonet

An extreme wind gust of 104 mph was recorded.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:09:00 to 27-AUG-20 21:09:00 (MST-7)
Location: HAYES AIRSTRIP
Magnitude: 62.00 MG
Reported by: Mesonet

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:14:00 to 27-AUG-20 21:14:00 (MST-7)
Location: LACY
Magnitude: 79.00 MG
Reported by: Mesonet

Thunderstorm Wind in SULLY, SOUTH DAKOTA
From 27-AUG-20 22:23:00 to 27-AUG-20 22:23:00 (CST-6)
Location: FIELDER
Magnitude: 54.00 MG
Reported by: Mesonet

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 27-AUG-20 22:35:00 to 27-AUG-20 22:35:00 (CST-6)
Location: (PIR)PIERRE ARPT
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 27-AUG-20 22:39:00 to 27-AUG-20 22:39:00 (CST-6)
Location: BLUNT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HUGHES, SOUTH DAKOTA
From 27-AUG-20 22:43:00 to 27-AUG-20 22:43:00 (CST-6)
Location: BLUNT
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 27-AUG-20 22:52:00 to 27-AUG-20 22:52:00 (CST-6)
Location: RELIANCE ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HYDE, SOUTH DAKOTA
From 27-AUG-20 23:04:00 to 27-AUG-20 23:04:00 (CST-6)
Location: HOLABIRD
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 27-AUG-20 23:20:00 to 27-AUG-20 23:20:00 (CST-6)
Location: DANFORTH
Magnitude: 61.00 EG
Reported by: Public

Estimated seventy mph winds damaged several outbuildings, fencing, and crops.

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 27-AUG-20 23:41:00 to 27-AUG-20 23:41:00 (CST-6)
Location: DANFORTH
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 28-AUG-20 00:55:00 to 28-AUG-20 00:55:00 (CST-6)
Location: STONE BRIDGE
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:13:00 to 28-AUG-20 01:13:00 (CST-6)
Location: JOHNSONVILLE
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Tornado in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:09:00 to 28-AUG-20 01:10:00 (CST-6)
Location: CLEAR LAKE MUNI ARPT
Tornado F-scale: EF0
Property damage: 0.00K
Reported by: NWS Storm Survey

A very brief tornado touched down in a small corn plot 5 miles west of Clear Lake just south of 182nd street. Corn was completely flattened in a distinct convergent pattern. Some tree limb damage had also occurred.

Tornado in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:11:00 to 28-AUG-20 01:13:00 (CST-6)
Location: CLEAR LAKE MUNI ARPT
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A brief tornado touchdown destroyed the roof and severely damaged the walls of a hog barn 5 miles west northwest of Clear Lake near 180th street. Debris from the roof was tossed a quarter mile to the north across the highway. Debris was also lodged in hay bales with hay bales damaged missing net wrap.

Tornado in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:09:00 to 28-AUG-20 01:10:00 (CST-6)
Location: CLEAR LAKE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A very brief tornado touched down causing mainly tree damage at a residence.  Large tree branches were broken and a few trees were uprooted.  Some minor damage was also done to sheet metal on a small building.  The track continued north of the residence, roughly one-half mile through a corn field.

Tornado in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:08:00 to 28-AUG-20 01:09:00 (CST-6)
Location: CLEAR LAKE
Tornado F-scale: EF0
Crop damage: 0.00K
Reported by: NWS Storm Survey

A very brief tornado touched down in a farm yard.  One small shed was completely destroyed, pulling the anchor posts out of the ground.  One hay shed roof was destroyed and was tossed into the side of the barn. The barn lean to roof was partially damaged as well.

Tornado in SPINK, SOUTH DAKOTA
From 27-AUG-20 23:56:00 to 28-AUG-20 00:00:00 (CST-6)
Location: REDFIELD
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado touched down on the east side of Redfield in the early morning hours. First indications of damage occurred in a corn field west of 386th avenue. Damage was then noted on east 8th avenue where several vehicles had windows damaged and a trailer was flipped into a corn field across the street. Trees along the property line with Farmers Meat Processing were damaged, one tree having landed facing west. Farmers Meat Processing signage was also torn out of the ground. The tornado path became clearly evident in the corn field across east 12th avenue. The tornado then traveled northeast into the Blume Seed Building which lost the west side doors and suffered significant wall damage, with the north wall destroyed.  Seed silos on the west side of the building also buckled.  The tornado spread debris from the Blume Seed building northeast into the adjacent grass field. A tree on the northeast side of this grass field toppled to the north with tree debris extending across U.S. Highway 212.  The circulation from the tornado persisted through several soybean and corn fields and resulted in tree damage near 387th Avenue.  The final crop damage was noted just south of 172nd Street.

Tornado in SPINK, SOUTH DAKOTA
From 27-AUG-20 23:56:00 to 28-AUG-20 00:00:00 (CST-6)
Location: REDFIELD
Tornado F-scale: EF0
Reported by: NWS Storm Survey

The tornado track started 2 miles east of Redfield near South Dakota Highway 212.  The track was evident through multiple corn fields with the corn completely leveled in some spots.  The tornado crossed 172nd street and traveled through a bean field before dissipating.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:30:00 to 27-AUG-20 21:30:00 (MST-7)
Location: FT PIERRE
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated seventy-five mph winds rolled and destroyed a trailer.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 27-AUG-20 21:30:00 to 27-AUG-20 21:30:00 (MST-7)
Location: FT PIERRE
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated seventy-five mph winds brought several trees down.

Thunderstorm Wind in HYDE, SOUTH DAKOTA
From 27-AUG-20 23:10:00 to 27-AUG-20 23:10:00 (CST-6)
Location: HIGHMORE
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated seventy mph winds blew the roof off a shop.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 28-AUG-20 00:00:00 to 28-AUG-20 00:00:00 (CST-6)
Location: REDFIELD
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated seventy mph winds took a 2 foot diameter tree down.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 28-AUG-20 00:45:00 to 28-AUG-20 00:45:00 (CST-6)
Location: HAYTI
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated eighty mph winds took the roof off a bus barn, damaged a daycare roof, and downed trees and branches in Hayti.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 28-AUG-20 00:50:00 to 28-AUG-20 00:50:00 (CST-6)
Location: LAKE NORDEN
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated sixty mph winds damaged the awnings on some campers and knocked down some tents.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 28-AUG-20 01:00:00 to 28-AUG-20 01:00:00 (CST-6)
Location: LAKE NORDEN
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated seventy mph winds caused tree and property damage.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:09:00 to 28-AUG-20 01:09:00 (CST-6)
Location: CLEAR LAKE
Magnitude: 78.00 EG
Crop damage: 0.00K
Reported by: NWS Storm Survey

Estimated ninety mph winds caused significant tree damage including trees uprooted and snapped at the base.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 28-AUG-20 01:20:00 to 28-AUG-20 01:20:00 (CST-6)
Location: ASTORIA
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated eighty mph winds downed numerous trees.