A frontal boundary along with high air moisture content resulted in severe thunderstorms along with very heavy rains and flash flooding across parts of northeast South Dakota.

Flash Flood in BROWN, SOUTH DAKOTA
From 06-AUG-15 05:30:00 to 06-AUG-15 08:15:00 (CST-6)
Location: COLUMBIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rains from 4 to over 6 inches brought flash flooding in and north of Columbia. Roads and streets were flooded along with the ditches being completely filled up.

Hail in BROWN, SOUTH DAKOTA
From 05-AUG-15 23:47:00 to 05-AUG-15 23:47:00 (CST-6)
Location: COLUMBIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:10:00 to 06-AUG-15 14:10:00 (CST-6)
Location: THOMAS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:10:00 to 06-AUG-15 14:10:00 (CST-6)
Location: HAZEL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CODINGTON, SOUTH DAKOTA
From 06-AUG-15 14:11:00 to 06-AUG-15 14:11:00 (CST-6)
Location: GROVER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:15:00 to 06-AUG-15 14:15:00 (CST-6)
Location: THOMAS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flood in BROWN, SOUTH DAKOTA
From 06-AUG-15 08:15:00 to 07-AUG-15 08:15:00 (CST-6)
Location: FREDERICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rains of 2 to over 6 inches brought areas of flooding across much of northern Brown county.  Several roads, ditches, along with many fields were flooded.

Hail in CLARK, SOUTH DAKOTA
From 06-AUG-15 13:52:00 to 06-AUG-15 13:58:00 (CST-6)
Location: NAPLES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:15:00 to 06-AUG-15 14:20:00 (CST-6)
Location: GROVER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:31:00 to 06-AUG-15 14:36:00 (CST-6)
Location: THOMAS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:50:00 to 06-AUG-15 14:55:00 (CST-6)
Location: CASTLEWOOD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:20:00 to 06-AUG-15 14:25:00 (CST-6)
Location: GROVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:00:00 to 06-AUG-15 14:15:00 (CST-6)
Location: GROVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Hail in HAMLIN, SOUTH DAKOTA
From 06-AUG-15 14:15:00 to 06-AUG-15 14:30:00 (CST-6)
Location: GROVER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SHAVE Project

Thunderstorm Wind in BROWN, SOUTH DAKOTA
From 06-AUG-15 00:30:00 to 06-AUG-15 00:30:00 (CST-6)
Location: COLUMBIA
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Sixty mph winds broke off most of the top of a tree in Columbia.

Hail in BROWN, SOUTH DAKOTA
From 06-AUG-15 00:01:00 to 06-AUG-15 00:01:00 (CST-6)
Location: COLUMBIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager