A series of supercell thunderstorms developed across northern Harding County and tracked northeastward into northwestern Perkins County and North Dakota. The storms produced large hail and gusty winds across much of the area. Two to three inches of rain fell over northern and central Harding County and produced flash flooding.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 21:10:00 to 22-JUL-11 21:10:00 (MST-7)
Location: LADNER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 21:50:00 to 22-JUL-11 21:50:00 (MST-7)
Location: BUFFALO
Magnitude: 2.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 22:17:00 to 22-JUL-11 22:17:00 (MST-7)
Location: (2WX)BUFFALO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in PERKINS, SOUTH DAKOTA
From 22-JUL-11 22:25:00 to 22-JUL-11 22:25:00 (MST-7)
Location: LODGEPOLE
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PERKINS, SOUTH DAKOTA
From 22-JUL-11 23:15:00 to 22-JUL-11 23:15:00 (MST-7)
Location: LODGEPOLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in HARDING, SOUTH DAKOTA
From 22-JUL-11 22:45:00 to 23-JUL-11 03:30:00 (MST-7)
Location: LADNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain flooded rural roads along Highway 85 north of Buffalo. Several roads, culverts, and driveways were damaged by the flash flood. Street flooding was also reported in Buffalo.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:25:00 to 22-JUL-11 20:35:00 (MST-7)
Location: BUFFALO
Magnitude: 2.50 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

Large hail damaged home, automobiles, and roof of an outbuilding.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:00:00 to 22-JUL-11 20:00:00 (MST-7)
Location: LUDLOW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 19:55:00 to 22-JUL-11 19:55:00 (MST-7)
Location: BUFFALO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:00:00 to 22-JUL-11 20:00:00 (MST-7)
Location: LUDLOW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:10:00 to 22-JUL-11 20:25:00 (MST-7)
Location: LUDLOW
Magnitude: 1.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:20:00 to 22-JUL-11 20:20:00 (MST-7)
Location: LUDLOW
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:25:00 to 22-JUL-11 20:25:00 (MST-7)
Location: LUDLOW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:02:00 to 22-JUL-11 20:02:00 (MST-7)
Location: RALPH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 20:50:00 to 22-JUL-11 20:50:00 (MST-7)
Location: LADNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 22-JUL-11 18:50:00 to 22-JUL-11 18:50:00 (MST-7)
Location: LADNER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 70 mph.

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 22-JUL-11 19:00:00 to 22-JUL-11 19:00:00 (MST-7)
Location: LADNER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts were estimated at 70 mph.

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 19:17:00 to 22-JUL-11 19:17:00 (MST-7)
Location: CAMP CROOK
Magnitude: 2.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Hail in HARDING, SOUTH DAKOTA
From 22-JUL-11 19:15:00 to 22-JUL-11 19:15:00 (MST-7)
Location: CAMP CROOK
Magnitude: 4.25 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Softball sized hail fell.