An unstable warm sector with MUCAPE up to 2000-2500 J/kg developed during the afternoon between an advancing cold front across southeast South Dakota, and a gangly warm front extending into southwest Minnesota. An approaching weak impulse spurred rapid development of multiple rounds of storms near the warm front, initially discrete, with upscale growth into short bowing segments. Secondary development occurred during the evening along the cold front, which evolved into a slow-moving linear system with hail, wind, and heavy rainfall with shear vectors increasingly parallel to the boundary.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:55:00 to 28-AUG-21 16:56:00 (CST-6)
Location: WESTBROOK
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:58:00 to 28-AUG-21 16:59:00 (CST-6)
Location: STORDEN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Tornado in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:04:00 to 28-AUG-21 17:12:00 (CST-6)
Location: JEFFERS
Tornado F-scale: EFU
Reported by: NWS Storm Survey

A tornado developed 5 miles north of Jeffers along 430th Avenue, one-quarter mile north of County Road 10.  The tornado caused damage to crops as it moved north-northeast over open farmland. Sentinel satellite imagery revealed a possible brief lift around 230th Street.  The tornado dissipated along 440th Avenue, one-half mile south of 210th St.  The average path width was 20 yards.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:43:00 to 28-AUG-21 16:46:00 (CST-6)
Location: SLAYTON
Magnitude: 56.00 EG
Reported by: Social Media

Significant tree damage was reported east of Slayton.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:50:00 to 28-AUG-21 16:53:00 (CST-6)
Location: WESTBROOK
Magnitude: 61.00 EG
Reported by: Emergency Manager

Thunderstorm winds caused damage to the Westbrook Lumber building.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:03:00 to 28-AUG-21 17:04:00 (CST-6)
Location: STORDEN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:54:00 to 28-AUG-21 16:57:00 (CST-6)
Location: STORDEN
Magnitude: 70.00 EG
Reported by: Emergency Manager

A grain bin was damaged by thunderstorm winds one-half mile south of Storden.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:03:00 to 28-AUG-21 17:06:00 (CST-6)
Location: JEFFERS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm winds snapped a large tree, from one to two feet in diameter, in half.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 16:03:00 to 28-AUG-21 16:06:00 (CST-6)
Location: LUVERNE ARPT
Magnitude: 53.00 MG
Crop damage: 12.00K
Reported by: Mesonet

Thunderstorm wind gust measured by a personal weather station. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in NOBLES, MINNESOTA
From 28-AUG-21 16:23:00 to 28-AUG-21 16:26:00 (CST-6)
Location: ADRIAN
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Emergency Manager

Large trees were leveled by thunderstorm wind gusts across southern portions of Adrian. Property damage costs are a rough estimate.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:48:00 to 28-AUG-21 16:51:00 (CST-6)
Location: WESTBROOK
Magnitude: 61.00 EG
Reported by: Emergency Manager

Numerous trees were downed across County Highway 7.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:22:00 to 28-AUG-21 16:24:00 (CST-6)
Location: CHANDLER
Magnitude: 65.00 EG
Property damage: 25.00K
Reported by: NWS Storm Survey

Portions of two barn roofs were removed by thunderstorm winds. Property damage costs are a rough estimate.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:36:00 to 28-AUG-21 16:39:00 (CST-6)
Location: AVOCA
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Emergency Manager

A machine shed was damaged by thunderstorm wind gusts. Property damage costs are a rough estimate.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 16:46:00 to 28-AUG-21 16:49:00 (CST-6)
Location: WESTBROOK
Magnitude: 56.00 EG
Property damage: 20.00K
Reported by: Emergency Manager

Thunderstorm winds damaged a grain bin one-half mile south of Westbrook, and an old barn 1 mile south of Westbrook. Property damage costs are a rough estimate.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 15:57:00 to 28-AUG-21 15:58:00 (CST-6)
Location: BEAVER CREEK
Magnitude: 52.00 EG
Crop damage: 100.00K
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 15:57:00 to 28-AUG-21 15:59:00 (CST-6)
Location: BEAVER CREEK
Magnitude: 59.00 MG
Reported by: Mesonet

Thunderstorm wind gust measured by Minnesota Road Weather Information System site MN006.

Tornado in MURRAY, MINNESOTA
From 28-AUG-21 16:40:00 to 28-AUG-21 16:43:00 (CST-6)
Location: AVOCA
Tornado F-scale: EFU
Reported by: NWS Storm Survey

A brief tornado started around 3 miles north-northeast of Avoca near 101st St., one-quarter mile west of 220th Avenue.  The tornado traveled north-northeast over open farmland for just under two miles with damage limited to crops, then lifted just southwest of the intersection of 121st Street and 225th Avenue. Based on Sentinel satellite imagery, the average path width was 20 yards.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:07:00 to 28-AUG-21 17:08:00 (CST-6)
Location: STORDEN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:03:00 to 28-AUG-21 17:04:00 (CST-6)
Location: JEFFERS
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:10:00 to 28-AUG-21 17:11:00 (CST-6)
Location: JEFFERS
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Hail in PIPESTONE, MINNESOTA
From 28-AUG-21 17:20:00 to 28-AUG-21 17:22:00 (CST-6)
Location: IHLEN
Magnitude: 1.00 
Crop damage: 4.00K
Reported by: Trained Spotter

Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in PIPESTONE, MINNESOTA
From 28-AUG-21 17:20:00 to 28-AUG-21 17:23:00 (CST-6)
Location: IHLEN
Magnitude: 56.00 EG
Crop damage: 76.00K
Reported by: Trained Spotter

Five inch diameter tree branches were downed by thunderstorm winds. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Tornado in MURRAY, MINNESOTA
From 28-AUG-21 16:53:00 to 28-AUG-21 16:56:00 (CST-6)
Location: DOVRAY
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Another brief tornado spun up 4 miles east-northeast of Dovray, around one-third mile southeast of the intersection of 151st Street and 290th Avenue. The tornado traveled north over open fields causing damage to crops, and dissipated just south of 171st Street, 5 miles northeast of Dovray.  From Sentinel satellite imagery, the average path width was found to be 20 yards.

Thunderstorm Wind in NOBLES, MINNESOTA
From 28-AUG-21 16:21:00 to 28-AUG-21 16:23:00 (CST-6)
Location: ADRIAN
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:33:00 to 28-AUG-21 16:34:00 (CST-6)
Location: IONA
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:49:00 to 28-AUG-21 16:50:00 (CST-6)
Location: DOVRAY
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:50:00 to 28-AUG-21 16:51:00 (CST-6)
Location: DOVRAY
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Flash Flood in MURRAY, MINNESOTA
From 28-AUG-21 22:00:00 to 29-AUG-21 00:00:00 (CST-6)
Location: AVOCA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water flowed over the road near the intersection of County Roads 30 and 38.

Hail in MURRAY, MINNESOTA
From 28-AUG-21 18:40:00 to 28-AUG-21 18:43:00 (CST-6)
Location: CURRANT LAKE
Magnitude: 2.25 
Crop damage: 19.00K
Reported by: Trained Spotter

Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 16:08:00 to 28-AUG-21 16:09:00 (CST-6)
Location: MAGNOLIA
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 16:00:00 to 28-AUG-21 16:03:00 (CST-6)
Location: LUVERNE ARPT
Magnitude: 53.00 MG
Reported by: Mesonet

Thunderstorm wind measured by personal weather station FW5856 near Luverne.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:21:00 to 28-AUG-21 16:24:00 (CST-6)
Location: CHANDLER
Magnitude: 56.00 EG
Reported by: Emergency Manager

Thunderstorm winds downed numerous 4 to 6 inch diameter tree limbs.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:30:00 to 28-AUG-21 16:33:00 (CST-6)
Location: IONA
Magnitude: 61.00 EG
Reported by: Emergency Manager

Numerous trees were snapped by thunderstorm winds.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:28:00 to 28-AUG-21 16:29:00 (CST-6)
Location: HADLEY
Magnitude: 52.00 EG
Crop damage: 275.00K
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:23:00 to 28-AUG-21 16:25:00 (CST-6)
Location: CHANDLER
Magnitude: 66.00 EG
Property damage: 4.00K
Reported by: NWS Storm Survey

Several large trees were snapped or uprooted by thunderstorm winds. Property damage costs are a rough estimate.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:53:00 to 28-AUG-21 16:54:00 (CST-6)
Location: DOVRAY
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:11:00 to 28-AUG-21 17:12:00 (CST-6)
Location: JEFFERS
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:11:00 to 28-AUG-21 17:12:00 (CST-6)
Location: JEFFERS
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 16:11:00 to 28-AUG-21 16:13:00 (CST-6)
Location: HARDWICK
Magnitude: 59.00 MG
Crop damage: 12.00K
Reported by: Mesonet

Thunderstorm wind gust measured by a personal weather station. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:03:00 to 28-AUG-21 17:05:00 (CST-6)
Location: STORDEN
Magnitude: 52.00 EG
Crop damage: 650.00K
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:06:00 to 28-AUG-21 17:08:00 (CST-6)
Location: WINDOM
Magnitude: 61.00 EG
Reported by: Public

A tree was uprooted by thunderstorm winds.

Thunderstorm Wind in COTTONWOOD, MINNESOTA
From 28-AUG-21 17:06:00 to 28-AUG-21 17:08:00 (CST-6)
Location: WINDOM MUNI ARPT
Magnitude: 57.00 MG
Reported by: AWOS

Thunderstorm wind gust was measured by automated weather station KWMM, 3 miles north of Windom.

Hail in MURRAY, MINNESOTA
From 28-AUG-21 18:36:00 to 28-AUG-21 18:38:00 (CST-6)
Location: CURRANT LAKE
Magnitude: 3.50 
Reported by: Social Media

Hail in MURRAY, MINNESOTA
From 28-AUG-21 18:41:00 to 28-AUG-21 18:43:00 (CST-6)
Location: CURRANT LAKE
Magnitude: 3.75 
Reported by: Social Media

Tornado in MURRAY, MINNESOTA
From 28-AUG-21 16:29:00 to 28-AUG-21 16:31:00 (CST-6)
Location: IONA
Tornado F-scale: EFU
Reported by: NWS Storm Survey

A tornado developed 4 miles west-northwest of Iona, approximately one-third of a mile west of 105th Avenue along 61st Street in an open field. The tornado tracked northeast for a little over a mile before it dissipated along 71st Street one-quarter mile east of 105th Avenue near the entrance to the Murray County landfill.  From Sentinel satellite imagery and a ground survey, the average path width was determined to be 30 yards as it passed through corn fields.

Tornado in MURRAY, MINNESOTA
From 28-AUG-21 16:48:00 to 28-AUG-21 16:49:00 (CST-6)
Location: DOVRAY
Tornado F-scale: EFU
Reported by: NWS Storm Survey

Identified from Sentinel satellite imagery and confirmed by ground survey, a tornado spun up one-half mile southwest of Dovray just east of 250th Avenue.  The tornado moved north over marsh and farmland, and caused damage to crops and cattails. The tornado dissipated one-half mile west of Dovray, just north of State Highway 30. The average path width was 20 yards.

Thunderstorm Wind in NOBLES, MINNESOTA
From 28-AUG-21 16:37:00 to 28-AUG-21 16:38:00 (CST-6)
Location: READING
Magnitude: 52.00 EG
Reported by: NWS Storm Survey

A narrow path of crop damage, possibly related to a miso vortex within a broader wind field, was identified using Sentinel satellite imagery.

Hail in ROCK, MINNESOTA
From 28-AUG-21 16:38:00 to 28-AUG-21 16:41:00 (CST-6)
Location: HILLS
Magnitude: 1.00 
Reported by: COOP Observer

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:38:00 to 28-AUG-21 16:41:00 (CST-6)
Location: AVOCA
Magnitude: 61.00 EG
Reported by: Public

Significant tree damage was reported in Avoca.

Thunderstorm Wind in ROCK, MINNESOTA
From 28-AUG-21 16:40:00 to 28-AUG-21 16:42:00 (CST-6)
Location: HILLS
Magnitude: 65.00 EG
Reported by: COOP Observer

Thunderstorm wind gusts knocked down several trees with trunks 2 to 3 feet in diameter.
Power lines were taken down as well, which resulted in a 3 hour outage.

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 16:40:00 to 28-AUG-21 16:43:00 (CST-6)
Location: SLAYTON
Magnitude: 52.00 MG
Reported by: AWOS

Thunderstorm wind measured by automated weather station KDVP near Slayton.

Hail in ROCK, MINNESOTA
From 28-AUG-21 19:08:00 to 28-AUG-21 19:10:00 (CST-6)
Location: HILLS
Magnitude: 1.75 
Reported by: Social Media

Thunderstorm Wind in MURRAY, MINNESOTA
From 28-AUG-21 19:27:00 to 28-AUG-21 19:29:00 (CST-6)
Location: DOVRAY
Magnitude: 51.00 MG
Reported by: Mesonet

The thunderstorm wind gust was measured by Minnesota RWIS station MN038 2 miles west of Dovray.

Hail in MURRAY, MINNESOTA
From 28-AUG-21 19:21:00 to 28-AUG-21 19:24:00 (CST-6)
Location: CURRIE
Magnitude: 1.75 
Reported by: Trained Spotter

Flash Flood in PIPESTONE, MINNESOTA
From 28-AUG-21 20:55:00 to 28-AUG-21 23:00:00 (CST-6)
Location: PIPESTONE ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy rainfall resulted in flooding of a garage, and water over the curb.