A surface low pressure area combined with a warm front brought many severe thunderstorms to central and northeast South Dakota through the late evening and early morning hours. Large hail and especially damaging winds affected parts of the area.

Hail in DEWEY, SOUTH DAKOTA
From 01-AUG-11 16:15:00 to 01-AUG-11 16:15:00 (MST-7)
Location: BEAR CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 01-AUG-11 01:45:00 to 01-AUG-11 01:45:00 (CST-6)
Location: MOBRIDGE
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees along with many tree branches were downed in Mobridge by seventy mph winds. Some power lines were also downed.

Thunderstorm Wind in HYDE, SOUTH DAKOTA
From 02-AUG-11 00:50:00 to 02-AUG-11 00:50:00 (CST-6)
Location: STEPHAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds downed several large tree branches.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 02-AUG-11 04:00:00 to 02-AUG-11 04:00:00 (CST-6)
Location: CASTLEWOOD
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Sixty mph winds downed several branches along with a tree in Castlewood.

Thunderstorm Wind in WALWORTH, SOUTH DAKOTA
From 01-AUG-11 01:32:00 to 01-AUG-11 01:32:00 (CST-6)
Location: MOBRIDGE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 01-AUG-11 22:35:00 to 01-AUG-11 22:35:00 (CST-6)
Location: MURDO MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated southwest of Murdo.

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 01-AUG-11 23:15:00 to 01-AUG-11 23:15:00 (CST-6)
Location: WESTOVER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty-five mph winds were estimated south of Draper.

Thunderstorm Wind in JONES, SOUTH DAKOTA
From 01-AUG-11 23:15:00 to 01-AUG-11 23:15:00 (CST-6)
Location: MURDO MUNI ARPT
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Seventy mph winds took some shingles off of several buildings.

Thunderstorm Wind in STANLEY, SOUTH DAKOTA
From 01-AUG-11 22:40:00 to 01-AUG-11 22:40:00 (MST-7)
Location: FT PIERRE
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 02-AUG-11 00:00:00 to 02-AUG-11 00:00:00 (CST-6)
Location: PRESHO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 02-AUG-11 00:00:00 to 02-AUG-11 00:00:00 (CST-6)
Location: PRESHO MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in LYMAN, SOUTH DAKOTA
From 02-AUG-11 00:00:00 to 02-AUG-11 00:00:00 (CST-6)
Location: MC CLURE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in HAND, SOUTH DAKOTA
From 02-AUG-11 01:35:00 to 02-AUG-11 01:35:00 (CST-6)
Location: MILLER
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 02-AUG-11 01:55:00 to 02-AUG-11 01:55:00 (CST-6)
Location: TULARE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds were estimated.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 02-AUG-11 02:20:00 to 02-AUG-11 02:20:00 (CST-6)
Location: TULARE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in GRANT, SOUTH DAKOTA
From 02-AUG-11 04:30:00 to 02-AUG-11 04:30:00 (CST-6)
Location: STOCKHOLM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Sixty mph winds downed several large tree branches.