A broad, organized line of thunderstorms moved across north central and northeastern South Dakota during the early morning hours, and produced damaging severe winds to near 80 mph at times. High wake low winds of up to over 60 mph then developed on the backside of the system. Trees, branches, power lines and poles were downed, and some structural damage occurred.

Thunderstorm Wind in EDMUNDS, SOUTH DAKOTA
From 26-AUG-21 05:49:00 to 26-AUG-21 05:49:00 (CST-6)
Location: BOWDLE
Magnitude: 57.00 MG
Reported by: Mesonet

Thunderstorm Wind in FAULK, SOUTH DAKOTA
From 26-AUG-21 06:40:00 to 26-AUG-21 06:40:00 (CST-6)
Location: BURKMERE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HYDE, SOUTH DAKOTA
From 26-AUG-21 06:59:00 to 26-AUG-21 06:59:00 (CST-6)
Location: HIGHMORE ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in FAULK, SOUTH DAKOTA
From 26-AUG-21 07:05:00 to 26-AUG-21 07:05:00 (CST-6)
Location: ORIENT
Magnitude: 65.00 MG
Reported by: Mesonet

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 26-AUG-21 07:11:00 to 26-AUG-21 07:11:00 (CST-6)
Location: POLO
Magnitude: 61.00 MG
Reported by: Mesonet

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 26-AUG-21 07:12:00 to 26-AUG-21 07:12:00 (CST-6)
Location: POLO
Magnitude: 61.00 EG
Reported by: Public

Winds were estimated at 70 mph.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 26-AUG-21 07:26:00 to 26-AUG-21 07:26:00 (CST-6)
Location: MELLETTE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 26-AUG-21 07:35:00 to 26-AUG-21 07:35:00 (CST-6)
Location: TULARE
Magnitude: 61.00 EG
Reported by: Trained Spotter

A tree trunk was split with multiple branches downed as well by estimated 70 mph winds.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 26-AUG-21 07:40:00 to 26-AUG-21 07:40:00 (CST-6)
Location: REDFIELD ARPT
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Several branches were downed by estimated 60 mph winds.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 26-AUG-21 07:55:00 to 26-AUG-21 07:55:00 (CST-6)
Location: DOLAND
Magnitude: 65.00 EG
Reported by: Emergency Manager

Eight power poles were snapped or tipped by estimated 75 mph winds.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 26-AUG-21 07:57:00 to 26-AUG-21 07:57:00 (CST-6)
Location: DOLAND
Magnitude: 61.00 EG
Reported by: Emergency Manager

Estimated seventy mph winds snapped a small tree and damaged a nearby grain elevator.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 26-AUG-21 08:22:00 to 26-AUG-21 08:22:00 (CST-6)
Location: CLARK
Magnitude: 70.00 EG
Reported by: Emergency Manager

Estimated 80 mph winds downed multiple trees and power lines. A grain bin was destroyed and a roof was torn off a building as well.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 26-AUG-21 08:27:00 to 26-AUG-21 08:27:00 (CST-6)
Location: CLARK
Magnitude: 52.00 EG
Reported by: Trained Spotter

Tree branches were downed by estimated 60 mph winds.

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 26-AUG-21 08:31:00 to 26-AUG-21 08:31:00 (CST-6)
Location: PEEVER
Magnitude: 58.00 MG
Reported by: Mesonet

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 26-AUG-21 08:32:00 to 26-AUG-21 08:32:00 (CST-6)
Location: WILLOW LAKE
Magnitude: 61.00 EG
Reported by: Public

A tree was toppled onto a house by estimated 70 mph winds.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 26-AUG-21 08:36:00 to 26-AUG-21 08:36:00 (CST-6)
Location: ELROD
Magnitude: 57.00 MG
Reported by: Mesonet

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 26-AUG-21 08:40:00 to 26-AUG-21 08:40:00 (CST-6)
Location: VIENNA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An estimated 60 mph wind was reported.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 26-AUG-21 08:54:00 to 26-AUG-21 08:54:00 (CST-6)
Location: HAYTI
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An estimated wind of 60 mph was reported.

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 26-AUG-21 09:01:00 to 26-AUG-21 09:01:00 (CST-6)
Location: (ATY)WATERTOWN ARPT
Magnitude: 65.00 MG
Reported by: ASOS

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 26-AUG-21 09:02:00 to 26-AUG-21 09:02:00 (CST-6)
Location: HAYTI
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 26-AUG-21 09:04:00 to 26-AUG-21 09:04:00 (CST-6)
Location: CASTLEWOOD
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 26-AUG-21 09:09:00 to 26-AUG-21 09:09:00 (CST-6)
Location: WATERTOWN
Magnitude: 65.00 EG
Reported by: Public

Numerous tree branches were downed by estimated 75 mph winds.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 26-AUG-21 09:31:00 to 26-AUG-21 09:31:00 (CST-6)
Location: JOHNSONVILLE
Magnitude: 65.00 MG
Reported by: Mesonet

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 26-AUG-21 09:31:00 to 26-AUG-21 09:31:00 (CST-6)
Location: TUNERVILLE
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in ROBERTS, SOUTH DAKOTA
From 26-AUG-21 13:34:00 to 26-AUG-21 13:34:00 (CST-6)
Location: PEEVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

High Wind in BROWN, SOUTH DAKOTA
From 26-AUG-21 08:33:00 to 26-AUG-21 08:33:00 (CST-6)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wake low high winds of 60 mph occurred at Aberdeen.

High Wind in DAY, SOUTH DAKOTA
From 26-AUG-21 09:26:00 to 26-AUG-21 09:26:00 (CST-6)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wake low high winds of 65 mph were recorded at Andover.

High Wind in DAY, SOUTH DAKOTA
From 26-AUG-21 10:21:00 to 26-AUG-21 10:21:00 (CST-6)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wake low high winds of 58 mph were recorded at Waubay.

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 26-AUG-21 09:02:00 to 26-AUG-21 09:02:00 (CST-6)
Location: WATERTOWN
Magnitude: 65.00 EG
Reported by: Emergency Manager

Multiple trees and branches were downed across Watertown by estimated 75 mph winds.