Tornadoes and Flash Flooding in South Dakota, August 28, 2021

Pickup truck was blown around the road by thunderstorm wind gusts.

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

Several power poles snapped by thunderstorm wind gusts. Property damage costs are a rough estimate.

Wind gusts estimated by Emergency Manager. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Based on Sentinel satellite imagery, a tornado spun up in Turner County southwest of the intersection of 279th Street and 464th Avenue. The tornado traveled east-northeast for around one-half mile through open farmland before it crossed into Lincoln County. While in Turner County, the tornado was rated EFU, but in Lincoln County it was rated EF1. The average path width in Turner County was 30 yards.

Based on Sentinel satellite imagery, the tornado spun up in Turner County around 2 miles west southwest of Lennox in a field southwest of the intersection of 464th Avenue and 279th Street. The tornado tracked east-northeast for around one-half mile and crossed into Lincoln County just south of the intersection of 279th Street and 464th Avenue. After another half mile, the tornado uprooted seven large cottonwood trees and damaged numerous others at the Lenkota Country Club. The tornado continued into the western portions of Lennox north of the city park, with a majority of damage to large trees between 4th and 5th Avenue as the path turned more eastward and eventually a bit southeastward. The most significant damage occurred as the tornado approached State Highway 17, with a trampoline deposited high in a gnarled tree along South Cherry Street, and the complete destruction of a shed just east of Highway 17. The tornado lifted about a quarter mile east of Highway 17, just east of Lennox. Areas south of the path experienced strong rear-flank winds. While in Turner County, the tornado was rated EFU, while in Lincoln County it was rated EF1. The average path width for the tornado was 100 yards. Property damage costs are a rough estimate.

Thunderstorms winds uprooted several pine trees in a row at the Lennox Cemetery.

The west facing roof was removed from a metal outbuilding by strong thunderstorm wind gusts. Property damage costs are a rough estimate.

Most of the rubber roof liner on the section of Lennox High School with the band and shop classrooms was removed by thunderstorm winds. Interior ceilings and equipment incurred water damage. Property damage costs are a rough estimate.

Several large trees trunks were snapped in the city park.

One shed was completely destroyed, and two were left with damaged doors, roofs and east facing walls when strong thunderstorm wind gusts plowed through a business on the south edge of Lennox. Property damage costs are a rough estimate.

Thunderstorm wind gust was measured by a personal weather station.

Based on Sentinel satellite imagery and confirmed with ground survey, a brief tornado spun up around 2 miles east of Lennox, just west of the Mount Olivet Cemetery. The tornado tracked east-northeast for less than one mile across open fields and wetlands, and dissipated 3 miles east-northeast of Lennox near the intersection of 278th Street and 468th Avenue. The average path width was 20 yards.

Several trees had large limbs of 3 to 6 inch diameter broken off by thunderstorm winds. A flag pole was bent.

Thunderstorms winds ripped the west end off a barn roof after door failure. Property damage costs are a rough estimate.

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

Metal roof pieces from a house were blown across the county road to the east. Several trees were gnarled with limbs down. Property damage costs are a rough estimate.

This tornado formed 2 miles north-northwest of Worthing, around one-half mile east of Interstate 29 and north of 278th Street. The tornado tracked northeast and then east-northeast for around one and one-half miles across open farmland and lifted 3 miles north-northeast of Worthing just south of 277th Street. The average path width, identified by crop damage in Sentinel satellite imagery, was 20 yards.

A car dealership sign was destroyed by thunderstorm wind gusts. Property damage costs are a rough estimate.

Two semi-trucks were flipped by thunderstorm wind gusts a little south of Exit 68 on Interstate 29. Property damage costs are a rough estimate.

Thunderstorm winds snapped several 6 to 12 inch diameter limbs.

Several power poles were snapped by thunderstorm winds. Property damage costs are a rough estimate.

A tornado spun up 4 miles northeast of Worthing, one-half mile north of 278th Street just east of 475th Avenue. The tornado tracked northeast for a little over a mile before it lifted 4 miles south of Harrisburg, just southwest of the intersection of 277th Street and 476th Avenue. Damage was limited to crops with the path defined on Sentinel satellite imagery. The average path width was 20 yards.

Thunderstorm wind gusts caused partial collapse of a pair of grain bins. Property damage costs are a rough estimate.

A large tree was knocked onto a fence at the Spencer Dog Park.

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 gusts resulted in significant tree damage.

Wind gust was measured by a personal weather station.

Thunderstorm wind gusts downed a large tree.

Branches from a large cottonwood tree were blown upward and landed on the roof of a house.

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

Hail varied from half-dollar to golf ball size.

Numerous roads in Tea were under water. Significant flooding with up to 2 feet of water was reported on portions of 271st Street and Heritage Parkway.

Water pooled up to two feet deep in the backyard of an apartment complex near 41st Street and South Dakota Highway 11.

The roadway of 6th Street and Cliff Avenue was estimated to around a foot deep.

Ponding of water caused water to reach basements.

Significant ponding of water resulted in some basement flooding.

Significant ponding and flooding of a small creek resulted in some basement flooding in lower spots.

Significant street flooding continued along Heritage Parkway and 271st Street.

As a response to 3 to 5 inches of rainfall across the southern portions of Sioux Falls, the Big Sioux at Western Avenue (gage site WAVS2) climbed into flood stage at 2130CST, with a crest 0.94 feet above flood stage at 2230CST. The Sioux Falls Marathon, which was scheduled to begin at 0530CST, was cancelled due to the overnight flash flooding.