An upper level trough over southern Canada combined with numerous surface boundaries to trigger evening severe thunderstorms across western North Dakota and eventually into south central North Dakota.  Numerous reports of large hail were received across the west where initially isolated splitting storms developed. As the convection moved east into south central North Dakota, a quasi-linear storm structure developed and intensified as it moved across Oliver County and eventually into the Bismarck area. The storms weakened east of Bismarck shortly before midnight.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-JUL-12 21:33:00 to 11-JUL-12 21:43:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Estimated peak gusts.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-JUL-12 21:36:00 to 11-JUL-12 21:42:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Estimated winds south of Lincoln.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-JUL-12 21:35:00 to 11-JUL-12 21:45:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-JUL-12 21:40:00 to 11-JUL-12 21:45:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Estimated peak winds rural north Bismarck.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 12-JUL-12 22:10:00 to 12-JUL-12 22:20:00 (CST-6)
Location: DRISCOLL
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in DUNN, NORTH DAKOTA
From 11-JUL-12 17:20:00 to 11-JUL-12 17:30:00 (MST-7)
Location: KILLDEER
Magnitude: 2.50 
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The very large hail damaged a patrol car.

Thunderstorm Wind in KIDDER, NORTH DAKOTA
From 12-JUL-12 22:25:00 to 12-JUL-12 22:33:00 (CST-6)
Location: DAWSON
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

The strong winds knocked down numerous small tree branches around Lake Isabel south of Dawson. Two pontoons were also flipped over.

Hail in MCKENZIE, NORTH DAKOTA
From 11-JUL-12 15:15:00 to 11-JUL-12 15:20:00 (MST-7)
Location: EAST FAIRVIEW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 11-JUL-12 16:46:00 to 11-JUL-12 16:52:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 11-JUL-12 17:05:00 to 11-JUL-12 17:20:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCKENZIE, NORTH DAKOTA
From 11-JUL-12 16:25:00 to 11-JUL-12 16:35:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DUNN, NORTH DAKOTA
From 11-JUL-12 17:39:00 to 11-JUL-12 17:45:00 (MST-7)
Location: KILLDEER
Magnitude: 1.50 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The large hail dented cars and damaged shingles on a home.

Hail in DUNN, NORTH DAKOTA
From 11-JUL-12 17:40:00 to 11-JUL-12 17:50:00 (MST-7)
Location: MANNING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HETTINGER, NORTH DAKOTA
From 11-JUL-12 17:35:00 to 11-JUL-12 17:45:00 (MST-7)
Location: NEW ENGLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in HETTINGER, NORTH DAKOTA
From 11-JUL-12 17:46:00 to 11-JUL-12 17:52:00 (MST-7)
Location: NEW ENGLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HETTINGER, NORTH DAKOTA
From 11-JUL-12 18:21:00 to 11-JUL-12 18:31:00 (MST-7)
Location: REGENT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, NORTH DAKOTA
From 11-JUL-12 18:06:00 to 11-JUL-12 18:15:00 (MST-7)
Location: NEW HRADEC
Magnitude: 1.75 
Property damage: 30.00K
Crop damage: 45.00K
Reported by: Public

The large hail damaged crops, homes, and vehicles.

Thunderstorm Wind in HETTINGER, NORTH DAKOTA
From 11-JUL-12 18:21:00 to 11-JUL-12 18:31:00 (MST-7)
Location: REGENT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail accompanied the strong winds.

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:08:00 to 11-JUL-12 18:18:00 (MST-7)
Location: DICKINSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:28:00 to 11-JUL-12 18:33:00 (MST-7)
Location: DICKINSON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:30:00 to 11-JUL-12 18:35:00 (MST-7)
Location: DICKINSON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:25:00 to 11-JUL-12 18:45:00 (MST-7)
Location: TAYLOR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:30:00 to 11-JUL-12 18:42:00 (MST-7)
Location: DICKINSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in STARK, NORTH DAKOTA
From 11-JUL-12 18:56:00 to 11-JUL-12 19:11:00 (MST-7)
Location: TAYLOR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 11-JUL-12 21:40:00 to 11-JUL-12 21:50:00 (CST-6)
Location: FT LINCOLN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail up to one half inch in diameter accompanied the strong winds.