Thunderstorms in southern North Dakota in the late evening of the 17th descended southeast across north central and northeast South Dakota into the early morning hours of the 18th.  The unique factor with these storms were the significant gust front winds that occurred well out ahead of the main area of thunderstorms. Severe wind gusts from 60 to around 75 mph occurred at many locations across the region causing damage.

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 17-JUL-20 21:40:00 to 17-JUL-20 21:40:00 (CST-6)
Location: RICHMOND
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated wind gusts to seventy-five mph downed a few large trees.

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 17-JUL-20 21:50:00 to 17-JUL-20 21:50:00 (CST-6)
Location: MINA
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

Estimated seventy-five mph winds downed a few trees at Mina Lake.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:15:00 to 17-JUL-20 22:15:00 (CST-6)
Location: CLAIRE CITY
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Estimated seventy-five mph winds downed many trees along with causing some power outages in Claire City.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:25:00 to 17-JUL-20 22:25:00 (CST-6)
Location: NEW EFFINGTON
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several trees were downed by estimated seventy-five mph winds in New Effington.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:35:00 to 17-JUL-20 22:35:00 (CST-6)
Location: SISSETON
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated seventy mph winds downed several trees along with causing some power outages in Sisseton.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:40:00 to 17-JUL-20 22:40:00 (CST-6)
Location: PEEVER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Several trees were downed in Peever by estimated seventy mph winds.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 17-JUL-20 22:45:00 to 17-JUL-20 22:45:00 (CST-6)
Location: WEBSTER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Estimated seventy mph winds downed several trees in Webster.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 17-JUL-20 22:47:00 to 17-JUL-20 22:47:00 (CST-6)
Location: GRENVILLE
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated seventy mph winds flipped a pontoon and downed a tree at Pickerel Lake.

Thunderstorm Wind in GRANT, SOUTH DAKOTA
From 17-JUL-20 23:20:00 to 17-JUL-20 23:20:00 (CST-6)
Location: MARVIN
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Public

Six grain bins received considerable denting from estimated seventy-five mph winds.

Thunderstorm Wind in MCPHERSON, SOUTH DAKOTA
From 17-JUL-20 21:40:00 to 17-JUL-20 21:40:00 (CST-6)
Location: EUREKA
Magnitude: 57.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 17-JUL-20 22:00:00 to 17-JUL-20 22:00:00 (CST-6)
Location: LAKE CITY
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 17-JUL-20 22:15:00 to 17-JUL-20 22:15:00 (CST-6)
Location: BOWDLE
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCPHERSON, SOUTH DAKOTA
From 17-JUL-20 22:15:00 to 17-JUL-20 22:15:00 (CST-6)
Location: LONG LAKE
Magnitude: 55.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 17-JUL-20 22:16:00 to 17-JUL-20 22:16:00 (CST-6)
Location: BATH
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:17:00 to 17-JUL-20 22:17:00 (CST-6)
Location: SISSETON ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MARSHALL, SOUTH DAKOTA
From 17-JUL-20 22:20:00 to 17-JUL-20 22:20:00 (CST-6)
Location: LAKE CITY
Magnitude: 56.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 17-JUL-20 22:22:00 to 17-JUL-20 22:22:00 (CST-6)
Location: (ABR)ABERDEEN RGNL A
Magnitude: 62.00 MG
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:23:00 to 17-JUL-20 22:23:00 (CST-6)
Location: VICTOR
Magnitude: 53.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 17-JUL-20 22:35:00 to 17-JUL-20 22:35:00 (CST-6)
Location: ANDOVER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:38:00 to 17-JUL-20 22:38:00 (CST-6)
Location: PEEVER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 17-JUL-20 22:51:00 to 17-JUL-20 22:51:00 (CST-6)
Location: SUMMIT
Magnitude: 61.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 17-JUL-20 23:37:00 to 17-JUL-20 23:37:00 (CST-6)
Location: (ATY)WATERTOWN ARPT
Magnitude: 66.00 MG
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 17-JUL-20 23:26:00 to 17-JUL-20 23:26:00 (CST-6)
Location: (ATY)WATERTOWN ARPT
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Estimated seventy-five mph winds downed several trees in Watertown along with many tree branches.  One tree fell on a camper destroying it. A few power lines were also downed.