Several supercell thunderstorms developed along a surface frontal boundary during the evening bringing large hail, damaging winds, along with a couple tornadoes.

Hail in STANLEY, SOUTH DAKOTA
From 10-AUG-07 18:00:00 to 10-AUG-07 18:00:00 (MST-7)
Location: ORTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CORSON, SOUTH DAKOTA
From 10-AUG-07 18:15:00 to 10-AUG-07 18:15:00 (MST-7)
Location: WAKPALA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 19:23:00 to 10-AUG-07 19:23:00 (CST-6)
Location: MOBRIDGE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 19:55:00 to 10-AUG-07 19:55:00 (CST-6)
Location: SELBY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in POTTER, SOUTH DAKOTA
From 10-AUG-07 20:00:00 to 10-AUG-07 20:00:00 (CST-6)
Location: LEBANON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 20:07:00 to 10-AUG-07 20:07:00 (CST-6)
Location: SELBY ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in POTTER, SOUTH DAKOTA
From 10-AUG-07 20:10:00 to 10-AUG-07 20:10:00 (CST-6)
Location: TOLSTOY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCPHERSON, SOUTH DAKOTA
From 10-AUG-07 20:14:00 to 10-AUG-07 20:14:00 (CST-6)
Location: EUREKA MUNI ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in EDMUNDS, SOUTH DAKOTA
From 10-AUG-07 20:40:00 to 10-AUG-07 20:40:00 (CST-6)
Location: BOWDLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in EDMUNDS, SOUTH DAKOTA
From 10-AUG-07 21:18:00 to 10-AUG-07 21:18:00 (CST-6)
Location: LOYALTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCPHERSON, SOUTH DAKOTA
From 10-AUG-07 23:48:00 to 10-AUG-07 23:48:00 (CST-6)
Location: LONG LAKE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in CORSON, SOUTH DAKOTA
From 10-AUG-07 17:06:00 to 10-AUG-07 17:09:00 (MST-7)
Location: TRAIL CITY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tornado touched down north of Timber Lake with no damage reported.

Tornado in CORSON, SOUTH DAKOTA
From 10-AUG-07 17:10:00 to 10-AUG-07 17:13:00 (MST-7)
Location: TRAIL CITY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A tornado touched down briefly north of Trail City with no damage occurring.

Tornado in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 20:25:00 to 10-AUG-07 20:27:00 (CST-6)
Location: LOWRY
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A tornado touched down west of Hoven with no damage occurring.

Thunderstorm Wind in DEWEY, SOUTH DAKOTA
From 10-AUG-07 18:00:00 to 10-AUG-07 18:00:00 (MST-7)
Location: CHEYENNE AGENCY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 10-AUG-07 21:34:00 to 10-AUG-07 21:34:00 (CST-6)
Location: ABERDEEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 10-AUG-07 21:25:00 to 10-AUG-07 21:25:00 (CST-6)
Location: BARNARD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BROWN, SOUTH DAKOTA
From 10-AUG-07 21:25:00 to 10-AUG-07 21:25:00 (CST-6)
Location: BARNARD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Funnel Cloud in CORSON, SOUTH DAKOTA
From 10-AUG-07 17:02:00 to 10-AUG-07 17:02:00 (MST-7)
Location: LITTLE EAGLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The fire department spotted a funnel cloud north of Timber Lake.

Hail in CORSON, SOUTH DAKOTA
From 10-AUG-07 16:00:00 to 10-AUG-07 16:00:00 (MST-7)
Location: BLACK HORSE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CORSON, SOUTH DAKOTA
From 10-AUG-07 17:41:00 to 10-AUG-07 17:41:00 (MST-7)
Location: TRAIL CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 18:57:00 to 10-AUG-07 18:57:00 (CST-6)
Location: MOBRIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 18:57:00 to 10-AUG-07 18:57:00 (CST-6)
Location: (Y26)MOBRIDGE ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in WALWORTH, SOUTH DAKOTA
From 10-AUG-07 18:50:00 to 10-AUG-07 19:05:00 (CST-6)
Location: MOBRIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Golf ball size hail fell in Mobridge breaking some windows and damaging the siding on several houses.

Hail in DEUEL, SOUTH DAKOTA
From 10-AUG-07 23:00:00 to 10-AUG-07 23:00:00 (CST-6)
Location: MORITZ
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public