Surface low pressure over southwest North Dakota combined with a lead short wave impulse to trigger thunderstorms across southwest and south central North Dakota through the afternoon hours and into the evening of August 5th. Severe Thunderstorm Watch number 729 and 731 were in effect for this event. One particularly strong bowing storm produced most of the large hail and high wind reports as it tracked from west of Dickinson across Morton and Burleigh counties before weakening.

Hail in BOWMAN, NORTH DAKOTA
From 05-AUG-11 12:36:00 to 05-AUG-11 12:41:00 (MST-7)
Location: RHAME
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOWMAN, NORTH DAKOTA
From 05-AUG-11 12:54:00 to 05-AUG-11 12:59:00 (MST-7)
Location: RHAME
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail accompanied the strong winds.

Hail in STARK, NORTH DAKOTA
From 05-AUG-11 13:54:00 to 05-AUG-11 13:59:00 (MST-7)
Location: BELFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STARK, NORTH DAKOTA
From 05-AUG-11 13:58:00 to 05-AUG-11 14:07:00 (MST-7)
Location: BELFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STARK, NORTH DAKOTA
From 05-AUG-11 14:20:00 to 05-AUG-11 14:28:00 (MST-7)
Location: BELFIELD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in STARK, NORTH DAKOTA
From 05-AUG-11 14:47:00 to 05-AUG-11 14:53:00 (MST-7)
Location: (DIK)DICKINSON MUNI
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in STARK, NORTH DAKOTA
From 05-AUG-11 14:54:00 to 05-AUG-11 14:59:00 (MST-7)
Location: DICKINSON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong winds were reported on Interstate 94 east of Dickinson.

Hail in GRANT, NORTH DAKOTA
From 05-AUG-11 16:20:00 to 05-AUG-11 16:27:00 (MST-7)
Location: ELGIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 05-AUG-11 16:50:00 to 05-AUG-11 16:58:00 (CST-6)
Location: HEBRON
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees were blown over by the strong winds in Hebron.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 05-AUG-11 16:53:00 to 05-AUG-11 16:59:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very heavy rain accompanied the strong winds.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 05-AUG-11 17:15:00 to 05-AUG-11 17:19:00 (CST-6)
Location: NEW SALEM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds were reported at New Salem.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 05-AUG-11 18:32:00 to 05-AUG-11 18:37:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Strong winds were reported at Horizon Middle School in north Bismarck.

Heavy Rain in STARK, NORTH DAKOTA
From 05-AUG-11 13:35:00 to 05-AUG-11 14:20:00 (MST-7)
Location: BELFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A heavy rainfall report of 2.90 inches was reported at Belfield.

Heavy Rain in STARK, NORTH DAKOTA
From 05-AUG-11 13:35:00 to 05-AUG-11 14:20:00 (MST-7)
Location: BELFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A heavy rain report of 2.90 inches was received from Belfield. This led to flash flooding. See the flash flood entry for Stark County.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 05-AUG-11 16:45:00 to 05-AUG-11 16:50:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: COOP Observer

Trees six to eight inches in diameter were snapped in Glen Ullin. Damage also occurred to several buildings and other structures.

Heavy Rain in STARK, NORTH DAKOTA
From 05-AUG-11 16:00:00 to 05-AUG-11 16:00:00 (MST-7)
Location: BELFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A storm total rainfall amount of 4 inches was reported at Belfield. This resulted in flash flooding. See the flash flood entry for Stark County.

Flash Flood in STARK, NORTH DAKOTA
From 05-AUG-11 14:00:00 to 05-AUG-11 17:00:00 (MST-7)
Location: SOUTH HEART
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Four inches of rain in this area flash flooded parts of Highway 10 near South Heart forcing the closure of the road. Deep water was also reported just outside of Belfield.