Severe thunderstorms developed north of a warm front across parts of central South Dakota early in the morning hours. These storms tracked along from west to east bringing large hail from quarter size to the size of tennis balls. As they moved into northeast South Dakota, the storms developed into a line as it moved east and bowed out.  Sixty to ninety mph winds occurred across parts of Clark, Codington, Hamlin and Deuel counties.  Many trees were damaged or blown down in these counties along with some buildings damaged. In Goodwin, beams from a shed went through the roof of a house. Much of the roof on another shed was blown off. A power pole was also snapped in Watertown along with a tree falling onto a house.

Hail in JONES, SOUTH DAKOTA
From 11-JUN-17 00:30:00 to 11-JUN-17 00:30:00 (CST-6)
Location: OKATON
Magnitude: 1.00 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 11-JUN-17 00:30:00 to 11-JUN-17 00:30:00 (CST-6)
Location: MC CLURE
Magnitude: 2.50 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 11-JUN-17 00:42:00 to 11-JUN-17 00:42:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.75 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 11-JUN-17 00:45:00 to 11-JUN-17 00:45:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.00 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 11-JUN-17 01:30:00 to 11-JUN-17 01:30:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.00 
Reported by: Public

Hail in HAND, SOUTH DAKOTA
From 11-JUN-17 01:40:00 to 11-JUN-17 01:40:00 (CST-6)
Location: DANFORTH
Magnitude: 1.25 
Reported by: Public

Hail in LYMAN, SOUTH DAKOTA
From 11-JUN-17 02:00:00 to 11-JUN-17 02:00:00 (CST-6)
Location: LOWER BRULE
Magnitude: 1.00 
Reported by: Public

Hail in HAND, SOUTH DAKOTA
From 11-JUN-17 02:15:00 to 11-JUN-17 02:15:00 (CST-6)
Location: DANFORTH
Magnitude: 1.75 
Reported by: Public

Hail in BUFFALO, SOUTH DAKOTA
From 11-JUN-17 02:35:00 to 11-JUN-17 02:35:00 (CST-6)
Location: GANN VLY
Magnitude: 1.00 
Reported by: Public

Hail in DEUEL, SOUTH DAKOTA
From 11-JUN-17 03:00:00 to 11-JUN-17 03:00:00 (CST-6)
Location: BRANDT
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in CLARK, SOUTH DAKOTA
From 11-JUN-17 03:38:00 to 11-JUN-17 03:38:00 (CST-6)
Location: GARDEN CITY
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in HAMLIN, SOUTH DAKOTA
From 11-JUN-17 04:25:00 to 11-JUN-17 04:25:00 (CST-6)
Location: STONE BRIDGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DEUEL, SOUTH DAKOTA
From 11-JUN-17 04:30:00 to 11-JUN-17 04:30:00 (CST-6)
Location: GOODWIN
Magnitude: 1.00 
Reported by: Public

Hail in GRANT, SOUTH DAKOTA
From 11-JUN-17 04:30:00 to 11-JUN-17 04:30:00 (CST-6)
Location: ALBEE
Magnitude: 1.00 
Reported by: Public

Hail in GRANT, SOUTH DAKOTA
From 11-JUN-17 05:05:00 to 11-JUN-17 05:05:00 (CST-6)
Location: REVILLO
Magnitude: 1.00 
Reported by: Public

Thunderstorm Wind in CODINGTON, SOUTH DAKOTA
From 11-JUN-17 04:40:00 to 11-JUN-17 04:40:00 (CST-6)
Location: (ATY)WATERTOWN ARPT
Magnitude: 61.00 EG
Reported by: Law Enforcement

Seventy mph winds brought some trees down along with causing some power outages in Watertown.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 11-JUN-17 04:50:00 to 11-JUN-17 04:50:00 (CST-6)
Location: ALTAMONT
Magnitude: 70.00 EG
Reported by: Trained Spotter

Eighty mph winds downed several trees along with snapping several evergreens off just off the ground.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 11-JUN-17 04:45:00 to 11-JUN-17 04:45:00 (CST-6)
Location: CLEAR LAKE MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sixty mph winds were estimated.

Thunderstorm Wind in GRANT, SOUTH DAKOTA
From 11-JUN-17 04:30:00 to 11-JUN-17 04:30:00 (CST-6)
Location: ALBEE
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Public

Three large trees were downed by an estimated eighty mph winds.

Thunderstorm Wind in DEUEL, SOUTH DAKOTA
From 11-JUN-17 04:30:00 to 11-JUN-17 04:30:00 (CST-6)
Location: GOODWIN
Magnitude: 78.00 EG
Reported by: Public

Estimated ninety mph winds brought beams from a shed through the roof of a house. Much of the roof on another shed was blown off.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 11-JUN-17 03:40:00 to 11-JUN-17 03:40:00 (CST-6)
Location: CLARK
Magnitude: 61.00 EG
Reported by: Trained Spotter

Seventy mph winds brought some trees down along with many tree branches in Clark.