A tornadic thunderstorm developed over central Ziebach County and slowly moved northeastward toward Red Elm and Dupree. The storm lingered and regenerated over the Dupree area for more than three hours; producing large hail, wind gusts near 100 mph, sixteen tornadoes, and torrential rainfall that caused widespread flooding. Significant damage occurred in Dupree, where several mobile homes were blown over, roofs were damaged, and trees were downed. Two people were injured in Dupree.

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:45:00 to 16-JUN-10 18:45:00 (MST-7)
Location: DUPREE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:51:00 to 16-JUN-10 18:51:00 (MST-7)
Location: DUPREE
Magnitude: 71.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser measured an 82 mph wind gust.

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:51:00 to 16-JUN-10 18:51:00 (MST-7)
Location: DUPREE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 16:15:00 to 16-JUN-10 16:25:00 (MST-7)
Location: RED ELM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 16:32:00 to 16-JUN-10 16:32:00 (MST-7)
Location: RED ELM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:45:00 to 16-JUN-10 18:45:00 (MST-7)
Location: THUNDER BUTTE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.  2.25 inches of rain fell in an hour and a half ending at 7 p.m. MST.

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:08:00 to 16-JUN-10 18:08:00 (MST-7)
Location: DUPREE
Magnitude: 72.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Ziebach County Sheriff measured a wind gust of 83 mph from the east-northeast with his traffic radar.

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 16:40:00 to 16-JUN-10 16:40:00 (MST-7)
Location: RED ELM
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser observed half dollar sized hail, with some stones the size of tennis balls.

Hail in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 18:25:00 to 16-JUN-10 18:25:00 (MST-7)
Location: DUPREE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 16:04:00 to 16-JUN-10 16:05:00 (MST-7)
Location: RED ELM
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A small tornado briefly touched down south of Red Elm.

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 17:22:00 to 16-JUN-10 17:45:00 (MST-7)
Location: RED ELM
Tornado F-scale: EF1
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Another tornado touched down southwest of Dupree and crossed U.S. Highway 212. It blew down several power poles. A small satellite tornado was observed at 1730 MST.

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 17:40:00 to 16-JUN-10 17:42:00 (MST-7)
Location: DUPREE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two small tornadoes touched down north of Dupree.

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 16:30:00 to 16-JUN-10 16:32:00 (MST-7)
Location: RED ELM
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A small tornado briefly touched down southwest of Dupree. Two small needle-shaped satellite tornadoes were observed in the same area at 1640 MST and 1641 MST.

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 17:53:00 to 16-JUN-10 17:58:00 (MST-7)
Location: DUPREE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Three small tornadoes touched down northeast of Dupree at 1753 MST. At 1754 MST, another tornado formed and a fifth tornado occurred at 1756 MST. Two smaller tornadoes were also observed at 1758 MST.

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 17:51:00 to 16-JUN-10 17:51:00 (MST-7)
Location: DUPREE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser estimated wind gusts at 70 to 80 mph.

Tornado in ZIEBACH, SOUTH DAKOTA
From 16-JUN-10 17:33:00 to 16-JUN-10 17:49:00 (MST-7)
Location: DUPREE
Tornado F-scale: EF2
Property damage: 750.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Another tornado touched down just south of Dupree and moved along the west side of town. It tore the roof off the community center, damaged a house and garage, crumpled large grain bins, and tossed several mobile homes. One person was injured when a mobile home was blown into the car in which he had taken cover and another person received minor injuries.