A mid level trough ejecting northeast through the Northern Rockies, combined with a stalled frontal boundary, resulted in strong to severe thunderstorm development across central Montana in the late afternoon. These storms continued to move and develop eastward into western and portions of central North Dakota during the evening hours of Wednesday, August 11th and into the early morning of Thursday, August 12th.
Multiple severe thunderstorm warnings were issued. Several reports of large hail and multiple reports of severe thunderstorm wind gusts were received during this episode.

Hail in MCKENZIE, NORTH DAKOTA
From 11-AUG-10 19:03:00 to 11-AUG-10 19:10:00 (MST-7)
Location: FAIRVIEW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 11-AUG-10 20:01:00 to 11-AUG-10 20:16:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ADAMS, NORTH DAKOTA
From 11-AUG-10 20:03:00 to 11-AUG-10 20:10:00 (MST-7)
Location: HAYNES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported an estimated wind speed of 60 mph.

Hail in DUNN, NORTH DAKOTA
From 11-AUG-10 20:54:00 to 11-AUG-10 21:08:00 (MST-7)
Location: KILLDEER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 11-AUG-10 22:12:00 to 11-AUG-10 22:19:00 (CST-6)
Location: PARSHALL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated winds of 60 mph were reported.

Thunderstorm Wind in DIVIDE, NORTH DAKOTA
From 11-AUG-10 22:18:00 to 11-AUG-10 22:25:00 (CST-6)
Location: CROSBY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Estimated winds of 60 mph were reported along with small hail and very heavy rain.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 12-AUG-10 01:23:00 to 12-AUG-10 01:28:00 (CST-6)
Location: JAMESTOWN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 11-AUG-10 23:51:00 to 12-AUG-10 00:01:00 (CST-6)
Location: EMMET
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Thunderstorm Wind in WARD, NORTH DAKOTA
From 11-AUG-10 23:10:00 to 11-AUG-10 23:17:00 (CST-6)
Location: MINOT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Estimated winds of 65 mph were reported.

Thunderstorm Wind in WARD, NORTH DAKOTA
From 11-AUG-10 23:03:00 to 11-AUG-10 23:09:00 (CST-6)
Location: DES LACS
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WARD, NORTH DAKOTA
From 11-AUG-10 23:16:00 to 11-AUG-10 23:21:00 (CST-6)
Location: MINOT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

This was the second of two rounds of wind to strike the city of Minot. The first round was associated with a gust front, and this second gust was associated with heavy precipitation.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-AUG-10 23:47:00 to 11-AUG-10 23:52:00 (CST-6)
Location: MOFFIT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS