An isolated supercell developed across south central South Dakota late evening along an advancing cold frontal boundary.  With appreciable DCAPE and deep-layer effective shear, upscale growth occurred rapidly with the development of widespread damaging winds.

Thunderstorm Wind in BON HOMME, SOUTH DAKOTA
From 16-SEP-21 22:43:00 to 16-SEP-21 22:44:00 (CST-6)
Location: TYNDALL
Magnitude: 61.00 EG
Reported by: Trained Spotter

Numerous branches were downed by thunderstorm winds, including an 8-inch diameter branch on the east side of Tyndall.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 23:19:00 to 16-SEP-21 23:21:00 (CST-6)
Location: COLTON
Magnitude: 61.00 EG
Reported by: Public

Numerous 3 inch tree limbs removed by thunderstorm winds.

Thunderstorm Wind in MOODY, SOUTH DAKOTA
From 16-SEP-21 23:04:00 to 16-SEP-21 23:06:00 (CST-6)
Location: SIOUX FALLS JCT
Magnitude: 54.00 MG
Reported by: Mesonet

Thunderstorm wind gust measured by South Dakota RWIS site located 15 miles west of Ward.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 23:15:00 to 16-SEP-21 23:17:00 (CST-6)
Location: BALTIC
Magnitude: 63.00 MG
Reported by: Mesonet

Thunderstorm wind gusts were measured by South Dakota State University mesonet site 3 miles southeast of Baltic (BTCS2).

Thunderstorm Wind in YANKTON, SOUTH DAKOTA
From 16-SEP-21 23:15:00 to 16-SEP-21 23:17:00 (CST-6)
Location: (YKN)CHAN GURNEY ARP
Magnitude: 55.00 MG
Reported by: AWOS

Thunderstorm winds measured by AWOS station KYKN 2 miles north northeast of Yankton.

Thunderstorm Wind in CHARLES MIX, SOUTH DAKOTA
From 16-SEP-21 22:20:00 to 16-SEP-21 22:22:00 (CST-6)
Location: GEDDES
Magnitude: 55.00 MG
Reported by: RAWS

Thunderstorm wind gusts measured by RAWS site RLAS2 3 miles west northwest of Geddes.

Thunderstorm Wind in HANSON, SOUTH DAKOTA
From 16-SEP-21 22:29:00 to 16-SEP-21 22:31:00 (CST-6)
Location: ALEXANDRIA
Magnitude: 56.00 MG
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD502 4 miles east northeast of Alexandria.

Thunderstorm Wind in CLAY, SOUTH DAKOTA
From 16-SEP-21 23:38:00 to 16-SEP-21 23:40:00 (CST-6)
Location: BURBANK
Magnitude: 62.00 MG
Crop damage: 2.00K
Reported by: Public

Wind gusts were measured by a personal weather station 2 miles north northeast of Burbank. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Hail in GREGORY, SOUTH DAKOTA
From 16-SEP-21 21:27:00 to 16-SEP-21 21:29:00 (CST-6)
Location: HERRICK
Magnitude: 1.25 
Crop damage: 7.00K
Reported by: Public

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

Thunderstorm Wind in UNION, SOUTH DAKOTA
From 16-SEP-21 23:37:00 to 16-SEP-21 23:39:00 (CST-6)
Location: ALSEN
Magnitude: 55.00 MG
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD508 3 miles south southwest of Beresford.

Thunderstorm Wind in GREGORY, SOUTH DAKOTA
From 16-SEP-21 22:16:00 to 16-SEP-21 22:18:00 (CST-6)
Location: FT RANDALL
Magnitude: 70.00 MG
Reported by: Mesonet

Thunderstorm wind gusts were measured by South Dakota RWIS site SD588 3 miles southwest of Pickstown.

Thunderstorm Wind in MINER, SOUTH DAKOTA
From 16-SEP-21 22:26:00 to 16-SEP-21 22:28:00 (CST-6)
Location: HOWARD
Magnitude: 51.00 MG
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD597 1 mile west of Howard.

Thunderstorm Wind in HUTCHINSON, SOUTH DAKOTA
From 16-SEP-21 22:31:00 to 16-SEP-21 22:33:00 (CST-6)
Location: TRIPP
Magnitude: 63.00 MG
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD570 1 mile northwest of Tripp.

Thunderstorm Wind in MOODY, SOUTH DAKOTA
From 16-SEP-21 23:17:00 to 16-SEP-21 23:19:00 (CST-6)
Location: SIOUX FALLS JCT
Magnitude: 56.00 MG
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD577 15 miles west of Ward.

Thunderstorm Wind in BROOKINGS, SOUTH DAKOTA
From 16-SEP-21 23:08:00 to 16-SEP-21 23:10:00 (CST-6)
Location: BROOKINGS
Magnitude: 51.00 MG
Crop damage: 33.00K
Reported by: Mesonet

Thunderstorm wind gust was measured by the South Dakota State Mesonet site 2 miles northeast of Brookings (BKMS2). Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in MCCOOK, SOUTH DAKOTA
From 16-SEP-21 22:56:00 to 16-SEP-21 22:58:00 (CST-6)
Location: MONTROSE
Magnitude: 67.00 MG
Crop damage: 2.00K
Reported by: Mesonet

Thunderstorm wind gusts were measured by South Dakota RWIS site SD547 3 miles southeast of Montrose. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Thunderstorm Wind in LINCOLN, SOUTH DAKOTA
From 16-SEP-21 23:34:00 to 16-SEP-21 23:36:00 (CST-6)
Location: LENNOX SKIE ARPT
Magnitude: 50.00 MG
Crop damage: 11.00K
Reported by: Mesonet

Thunderstorm wind gusts measured by South Dakota RWIS site SD519 9 miles east of Davis. Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

Hail in GREGORY, SOUTH DAKOTA
From 16-SEP-21 21:27:00 to 16-SEP-21 21:29:00 (CST-6)
Location: BURKE
Magnitude: 0.75 
Reported by: Trained Spotter

Hail was accompanied by strong wind, but there was no damage.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 22:58:00 to 16-SEP-21 23:00:00 (CST-6)
Location: HUMBOLDT
Magnitude: 65.00 EG
Reported by: Public

Multiple trees were damaged by thunderstorm winds, along with several utility trailers.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 22:58:00 to 16-SEP-21 23:00:00 (CST-6)
Location: HUMBOLDT
Magnitude: 70.00 EG
Property damage: 500.00K
Reported by: Public

Thunderstorm winds damaged grain elevator bins. Property damage costs are a rough estimate.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 23:05:00 to 16-SEP-21 23:07:00 (CST-6)
Location: HARTFORD
Magnitude: 65.00 EG
Property damage: 2.00K
Reported by: Social Media

Large tree limbs downed by thunderstorm winds. Property damage costs are a rough estimate.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 16-SEP-21 23:12:00 to 16-SEP-21 23:14:00 (CST-6)
Location: CROOKS
Magnitude: 65.00 EG
Property damage: 8.00K
Reported by: Public

Several rows of shingles were blown off a house and garage by thunderstorm winds.
A large tree in the adjoining yard was also blown down. Property damage costs are a rough estimate.