An upper level disturbance combined with a warm front and very unstable air brought  severe thunderstorms to parts of central and north central South Dakota. Hail up to the size of golfballs, flash flooding, along with several tornadoes occurred with these storms.

Flash Flood in DEWEY, SOUTH DAKOTA
From 15-JUN-09 18:00:00 to 15-JUN-09 18:45:00 (MST-7)
Location: EAGLE BUTTE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain flooded several roads in and around Eagle Butte.

Hail in CORSON, SOUTH DAKOTA
From 14-JUN-09 23:00:00 to 14-JUN-09 23:00:00 (MST-7)
Location: LITTLE EAGLE
Magnitude: 0.88 
Reported by: Trained Spotter

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 17:45:00 to 15-JUN-09 17:45:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 0.88 
Reported by: Law Enforcement

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 17:40:00 to 15-JUN-09 17:40:00 (MST-7)
Location: PARADE
Magnitude: 1.75 
Reported by: Public

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 16:50:00 to 15-JUN-09 16:50:00 (MST-7)
Location: PARADE
Magnitude: 1.00 
Reported by: Public

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 17:15:00 to 15-JUN-09 17:15:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 18:10:00 to 15-JUN-09 18:10:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 0.88 
Reported by: Other Federal Agency

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 18:20:00 to 15-JUN-09 18:20:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 1.25 
Reported by: Trained Spotter

Flash Flood in DEWEY, SOUTH DAKOTA
From 15-JUN-09 16:30:00 to 15-JUN-09 18:30:00 (MST-7)
Location: PARADE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rain caused flash flooding on the Moreau River with the bridge on Route 14 being overtopped. The bridge had to be closed west of Green Grass. A basement was also flooded three miles east of Green Grass along with several roads in the area.

Tornado in STANLEY, SOUTH DAKOTA
From 15-JUN-09 20:30:00 to 15-JUN-09 20:35:00 (MST-7)
Location: HAYES AIRSTRIP
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A third tornado touched down east of Hayes with no resulting damage.

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 18:23:00 to 15-JUN-09 18:23:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 1.50 
Reported by: Other Federal Agency

Hail in STANLEY, SOUTH DAKOTA
From 15-JUN-09 19:00:00 to 15-JUN-09 19:00:00 (MST-7)
Location: HAYES HAMILTON ARPT
Magnitude: 1.75 
Reported by: Public

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 19:05:00 to 15-JUN-09 19:05:00 (MST-7)
Location: THATCHER
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in STANLEY, SOUTH DAKOTA
From 15-JUN-09 19:25:00 to 15-JUN-09 19:25:00 (MST-7)
Location: HAYES HAMILTON ARPT
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in STANLEY, SOUTH DAKOTA
From 15-JUN-09 20:11:00 to 15-JUN-09 20:11:00 (MST-7)
Location: HAYES
Magnitude: 1.75 
Reported by: Emergency Manager

Hail in STANLEY, SOUTH DAKOTA
From 15-JUN-09 20:39:00 to 15-JUN-09 20:39:00 (MST-7)
Location: BUNKER
Magnitude: 1.00 
Reported by: COOP Observer

Tornado in STANLEY, SOUTH DAKOTA
From 15-JUN-09 20:05:00 to 15-JUN-09 20:11:00 (MST-7)
Location: HAYES
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A tornado touched down west of Hayes and traveled almost a mile before lifting. No damage occurred.

Tornado in STANLEY, SOUTH DAKOTA
From 15-JUN-09 20:20:00 to 15-JUN-09 20:23:00 (MST-7)
Location: HAYES AIRSTRIP
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A second tornado touched down east of Hayes with no damage occurring.

Hail in DEWEY, SOUTH DAKOTA
From 15-JUN-09 17:47:00 to 15-JUN-09 17:47:00 (MST-7)
Location: EAGLE BUTTE
Magnitude: 0.88 
Reported by: Other Federal Agency