Thunderstorms produced damaging winds and flash flooding over a stretch of southeast South Dakota near and north of Interstate 90, on the night of July 26th and 27th. the damaging wind reports came on the evening of July 26th. The flash flooding affected the Sioux Falls area after midnight on July 27th.

Thunderstorm Wind in BEADLE, SOUTH DAKOTA
From 26-JUL-11 19:15:00 to 26-JUL-11 19:15:00 (CST-6)
Location: BONILLA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage.

Thunderstorm Wind in BEADLE, SOUTH DAKOTA
From 26-JUL-11 19:43:00 to 26-JUL-11 19:43:00 (CST-6)
Location: WOLSEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several branches blown down.

Thunderstorm Wind in BEADLE, SOUTH DAKOTA
From 26-JUL-11 19:45:00 to 26-JUL-11 19:45:00 (CST-6)
Location: WOLSEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several branches blown down.

Thunderstorm Wind in BEADLE, SOUTH DAKOTA
From 26-JUL-11 19:52:00 to 26-JUL-11 19:52:00 (CST-6)
Location: HURON
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm winds blew branches off several trees.

Thunderstorm Wind in BEADLE, SOUTH DAKOTA
From 26-JUL-11 20:12:00 to 26-JUL-11 20:12:00 (CST-6)
Location: YALE
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused considerable tree damage in Yale.

Thunderstorm Wind in JERAULD, SOUTH DAKOTA
From 26-JUL-11 21:10:00 to 26-JUL-11 21:10:00 (CST-6)
Location: CROW LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including several branches blown down.

Thunderstorm Wind in JERAULD, SOUTH DAKOTA
From 26-JUL-11 21:25:00 to 26-JUL-11 21:25:00 (CST-6)
Location: LANE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including numerous branches blown down.

Thunderstorm Wind in MINER, SOUTH DAKOTA
From 26-JUL-11 22:05:00 to 26-JUL-11 22:05:00 (CST-6)
Location: CARTHAGE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage. The winds were accompanied by heavy rain.

Thunderstorm Wind in MCCOOK, SOUTH DAKOTA
From 26-JUL-11 23:05:00 to 26-JUL-11 23:05:00 (CST-6)
Location: SALEM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several branches.

Thunderstorm Wind in MINNEHAHA, SOUTH DAKOTA
From 26-JUL-11 23:35:00 to 26-JUL-11 23:35:00 (CST-6)
Location: BUFFALO TRADING POST
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds caused tree damage, including up to 3 inch diameter branches blown down. The winds were accompanied by heavy rain.

Flash Flood in MINNEHAHA, SOUTH DAKOTA
From 27-JUL-11 03:10:00 to 27-JUL-11 05:30:00 (CST-6)
Location: SIOUX FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Heavy rainfall, measured at up to 5.75 inches, caused flash flooding of many streets and yards in Sioux Falls, with several vehicles becoming stranded. The water was deep enough on some roads to make it difficult for police and rescue units to reach some stranded motorists, and a few roads became impassable. Water was also reported in basements.