A surface low pressure system which developed over eastern Montana combined with a strong short wave to produce thunderstorms throughout the region.  Many storms became severe with very strong instability and shear noted.  Large hail was the initial severe threat, with the largest hail over Hettinger County where ping pong ball sized hail was reported. Later in the evening, strong wind gusts became the primary severe threat.  The strongest wind gusts were reported in Foster and McIntosh Counties where substantial damage occurred on farmsteads.

Hail in DIVIDE, NORTH DAKOTA
From 21-JUN-15 14:15:00 to 21-JUN-15 14:17:00 (CST-6)
Location: ALKABO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURKE, NORTH DAKOTA
From 21-JUN-15 15:20:00 to 21-JUN-15 15:23:00 (CST-6)
Location: COTEAU
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOWMAN, NORTH DAKOTA
From 21-JUN-15 16:55:00 to 21-JUN-15 17:00:00 (MST-7)
Location: RHAME
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HETTINGER, NORTH DAKOTA
From 21-JUN-15 18:35:00 to 21-JUN-15 18:37:00 (MST-7)
Location: MOTT MUNI ARPT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 21-JUN-15 19:00:00 to 21-JUN-15 19:02:00 (CST-6)
Location: NEW SALEM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 21-JUN-15 19:05:00 to 21-JUN-15 19:08:00 (CST-6)
Location: NEW SALEM
Magnitude: 74.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Large tree limbs were downed in the New Salem area.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 21-JUN-15 21:25:00 to 21-JUN-15 21:32:00 (CST-6)
Location: KENSAL
Magnitude: 85.00 EG
Property damage: 300.00K
Crop damage: 50.00K
Reported by: Trained Spotter

An insulated pole barn style shop building was destroyed at a farmstead east-northeast of Kensal. Additional damage included a collapsed portion of a steel grain bin roof and a grain auger blown over. Several large tree limbs were snapped.

Thunderstorm Wind in MCINTOSH, NORTH DAKOTA
From 21-JUN-15 21:35:00 to 21-JUN-15 21:50:00 (CST-6)
Location: ZEELAND
Magnitude: 70.00 EG
Property damage: 400.00K
Crop damage: 200.00K
Reported by: Law Enforcement

Strong winds were reported from three miles north of Zeeland to 10 miles north of Zeeland. Law enforcement reported multiple downed power poles. A camper was rolled, and damage occurred at a farmstead approximately six miles north of Zeeland, with a grain auger blown over and a temporary grain enclosure ruined. A house was also shifted off of its foundation. Multiple mature trees were uprooted and others snapped.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 21-JUN-15 19:31:00 to 21-JUN-15 19:34:00 (CST-6)
Location: JUDSON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported strong thunderstorm wind gusts in the Judson area.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 21-JUN-15 20:05:00 to 21-JUN-15 20:07:00 (CST-6)
Location: ST ANTHONY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

An amateur radio operator near St. Anthony reported strong thunderstorm wind gusts.

Thunderstorm Wind in FOSTER, NORTH DAKOTA
From 21-JUN-15 21:00:00 to 21-JUN-15 21:04:00 (CST-6)
Location: CARRINGTON ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hail in EMMONS, NORTH DAKOTA
From 21-JUN-15 21:05:00 to 21-JUN-15 21:08:00 (CST-6)
Location: LINTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in EMMONS, NORTH DAKOTA
From 21-JUN-15 21:05:00 to 21-JUN-15 21:08:00 (CST-6)
Location: LINTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Linton reported strong thunderstorm wind gusts.

Thunderstorm Wind in BOWMAN, NORTH DAKOTA
From 21-JUN-15 21:06:00 to 21-JUN-15 21:08:00 (MST-7)
Location: RHAME
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter west-southwest of Rhame reported strong thunderstorm wind gusts.

Thunderstorm Wind in BOWMAN, NORTH DAKOTA
From 21-JUN-15 21:09:00 to 21-JUN-15 21:11:00 (MST-7)
Location: RHAME
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in EMMONS, NORTH DAKOTA
From 21-JUN-15 21:10:00 to 21-JUN-15 21:12:00 (CST-6)
Location: LINTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in EMMONS, NORTH DAKOTA
From 21-JUN-15 21:10:00 to 21-JUN-15 21:10:00 (CST-6)
Location: LINTON MUNI ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in FOSTER, NORTH DAKOTA
From 21-JUN-15 21:13:00 to 21-JUN-15 21:16:00 (CST-6)
Location: CARRINGTON ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in ADAMS, NORTH DAKOTA
From 21-JUN-15 21:28:00 to 21-JUN-15 21:30:00 (MST-7)
Location: HETTINGER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement in Hettinger reported strong thunderstorm wind gusts.

Thunderstorm Wind in MCINTOSH, NORTH DAKOTA
From 21-JUN-15 21:49:00 to 21-JUN-15 21:52:00 (CST-6)
Location: ASHLEY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the public in Ashley reported strong thunderstorm wind gusts.