A severe thunderstorm outbreak materialized over west and south central North Dakota in the late afternoon and evening hours of July 22nd, lasting into the early morning hours of the 23rd. Tornado watch numbers 673, 674, and 675 were in effect for this event. A tornadic storm developed over south central North Dakota along a surface warm front. Much of the severe weather for this event originated over eastern Montana associated with a strong upper level jet streak. This activity pushed into western North Dakota, and tracked eastward throughout the evening. The severe weather event resulted in large hail, high winds, tornadoes, and flash floods.

Flash Flood in BILLINGS, NORTH DAKOTA
From 22-JUL-11 19:05:00 to 22-JUL-11 22:30:00 (MST-7)
Location: MEDORA
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to four inches of very heavy rainfall resulted in the camp grounds at Medora being flash flooded.

Tornado in MORTON, NORTH DAKOTA
From 22-JUL-11 21:10:00 to 22-JUL-11 21:12:00 (CST-6)
Location: GLEN ULLIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This tornado touched down in the open country. There were no reports of damage associated with this tornado.

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 22-JUL-11 18:31:00 to 22-JUL-11 18:36:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A report of 60 mile per hour winds was received.

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 22-JUL-11 18:39:00 to 22-JUL-11 18:45:00 (MST-7)
Location: KILLDEER
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Funnel Cloud in SLOPE, NORTH DAKOTA
From 22-JUL-11 19:28:00 to 22-JUL-11 19:28:00 (MST-7)
Location: MARMARTH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Hail in BOWMAN, NORTH DAKOTA
From 22-JUL-11 19:12:00 to 22-JUL-11 19:12:00 (MST-7)
Location: RHAME
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 22-JUL-11 21:54:00 to 22-JUL-11 21:59:00 (CST-6)
Location: PICK CITY
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

The strong winds flipped over campers.

Thunderstorm Wind in MCINTOSH, NORTH DAKOTA
From 22-JUL-11 23:30:00 to 22-JUL-11 23:45:00 (CST-6)
Location: ZEELAND
Magnitude: 70.00 EG
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong thunderstorm winds occurred north of Zeeland. A quonset and pole barn were destroyed, shingle and siding damage was sustained to a home, and two trees were blown down.

Hail in DUNN, NORTH DAKOTA
From 22-JUL-11 19:14:00 to 22-JUL-11 19:17:00 (MST-7)
Location: MARSHALL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in HETTINGER, NORTH DAKOTA
From 22-JUL-11 20:01:00 to 22-JUL-11 20:06:00 (MST-7)
Location: REGENT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MERCER, NORTH DAKOTA
From 22-JUL-11 20:30:00 to 22-JUL-11 20:35:00 (CST-6)
Location: ZAP
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MERCER, NORTH DAKOTA
From 22-JUL-11 20:40:00 to 22-JUL-11 20:46:00 (CST-6)
Location: ZAP
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCINTOSH, NORTH DAKOTA
From 22-JUL-11 23:50:00 to 23-JUL-11 00:10:00 (CST-6)
Location: ASHLEY
Magnitude: 70.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Newspaper

Strong thunderstorm winds resulted in damage to buildings on a farmstead, and damage to hay bales.

Hail in MORTON, NORTH DAKOTA
From 22-JUL-11 22:06:00 to 22-JUL-11 22:13:00 (CST-6)
Location: MANDAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MORTON, NORTH DAKOTA
From 22-JUL-11 21:45:00 to 22-JUL-11 21:48:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 22-JUL-11 22:10:00 to 22-JUL-11 22:14:00 (CST-6)
Location: MANDAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HETTINGER, NORTH DAKOTA
From 22-JUL-11 23:00:00 to 22-JUL-11 23:05:00 (MST-7)
Location: REGENT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Thunderstorm Wind in HETTINGER, NORTH DAKOTA
From 22-JUL-11 19:56:00 to 22-JUL-11 20:00:00 (MST-7)
Location: NEW ENGLAND
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: COOP Observer

The strong winds uprooted some trees in New England.

Thunderstorm Wind in BOWMAN, NORTH DAKOTA
From 22-JUL-11 19:05:00 to 22-JUL-11 19:10:00 (MST-7)
Location: RHAME
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong thunderstorm winds occurred over southwest Bowman County.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 22-JUL-11 20:40:00 to 22-JUL-11 20:45:00 (CST-6)
Location: ZAP
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain accompanied the strong winds.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 22-JUL-11 21:45:00 to 22-JUL-11 21:50:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A report of strong thunderstorm winds was received.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 22-JUL-11 21:54:00 to 22-JUL-11 21:56:00 (CST-6)
Location: MANDAN
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 22-JUL-11 22:01:00 to 22-JUL-11 22:06:00 (CST-6)
Location: BISMARCK
Magnitude: 56.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree branches were blown down.

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 22-JUL-11 22:13:00 to 22-JUL-11 22:15:00 (CST-6)
Location: MANDAN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Heavy Rain in MCKENZIE, NORTH DAKOTA
From 22-JUL-11 18:00:00 to 22-JUL-11 18:30:00 (MST-7)
Location: GRASSY BUTTE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A heavy rainfall report of 1.13 inches in one half hour was received.

Flash Flood in STUTSMAN, NORTH DAKOTA
From 23-JUL-11 00:15:00 to 23-JUL-11 04:00:00 (CST-6)
Location: WOODWORTH
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: COOP Observer

Some roads under water from the very heavy rainfall.

Flash Flood in MOUNTRAIL, NORTH DAKOTA
From 22-JUL-11 22:03:00 to 23-JUL-11 01:15:00 (CST-6)
Location: NEW TOWN
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Very heavy rain resulted in an estimated one foot of water on Main Street in New Town. Water was in yards of homes and in some cases where there was no curbing the water was up against the homes.

Heavy Rain in MCKENZIE, NORTH DAKOTA
From 22-JUL-11 18:00:00 to 22-JUL-11 18:30:00 (MST-7)
Location: GRASSY BUTTE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A heavy rainfall report of 1.3 inches in one half hour was received.

Heavy Rain in DUNN, NORTH DAKOTA
From 22-JUL-11 18:53:00 to 22-JUL-11 19:53:00 (MST-7)
Location: WERNER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A heavy rainfall report of 2.45 inches in one hour was received.

Heavy Rain in MERCER, NORTH DAKOTA
From 22-JUL-11 20:10:00 to 22-JUL-11 20:40:00 (CST-6)
Location: ZAP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A heavy rainfall report of 1.8 inches in one half hour was received.

Thunderstorm Wind in EMMONS, NORTH DAKOTA
From 22-JUL-11 22:50:00 to 22-JUL-11 22:57:00 (CST-6)
Location: LINTON
Magnitude: 61.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Newspaper

The strong thunderstorm winds destroyed a cabin at Beaver Bay.

Flash Flood in DUNN, NORTH DAKOTA
From 22-JUL-11 19:15:00 to 22-JUL-11 23:00:00 (MST-7)
Location: WERNER
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were two reports of very heavy rain from northern Dunn County. One was 1.24 inches in 25 minutes about 10 miles northeast of Dunn Center and the other was 1.50 inches in 45 minutes from about 6 miles north-northeast of Killdeer. Reports of flash flooding of low lying and poor drainage areas were received. Damage was not significant.

Tornado in MORTON, NORTH DAKOTA
From 22-JUL-11 17:40:00 to 22-JUL-11 17:41:00 (CST-6)
Location: ALMONT
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This tornado touched down in the open country. There were no reports of damage associated with this tornado.

Hail in MORTON, NORTH DAKOTA
From 22-JUL-11 17:37:00 to 22-JUL-11 17:45:00 (CST-6)
Location: ALMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in MCKENZIE, NORTH DAKOTA
From 22-JUL-11 18:23:00 to 22-JUL-11 18:24:00 (MST-7)
Location: GRASSY BUTTE
Tornado F-scale: EF0
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A brief tornado occurred and resulted in a traffic accident with injuries (indirect). A local newpaper article stated that a semi truck hit a downed power line which cut into the cab of the truck. The line then snapped, sending it into a parked vehicle. The semi truck then collided with a third vehicle. Two people were injured (indirect) during this accident. This chain of events occurred after the tornado had passed, leaving the downed line in its wake. The tornado damage to the power line corresponded to EF0 on the Enhanced Fujita Scale.

Thunderstorm Wind in GOLDEN VALLEY, NORTH DAKOTA
From 22-JUL-11 17:40:00 to 22-JUL-11 17:46:00 (MST-7)
Location: BEACH
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in SLOPE, NORTH DAKOTA
From 22-JUL-11 18:30:00 to 22-JUL-11 18:35:00 (MST-7)
Location: AMIDON
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Several tree branches were blown off from the strong winds.

Tornado in STARK, NORTH DAKOTA
From 22-JUL-11 18:35:00 to 22-JUL-11 18:36:00 (MST-7)
Location: BELFIELD
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This tornado touched down just to the south of Belfield. There were no reports of damage associated with this short lived tornado.

Tornado in STARK, NORTH DAKOTA
From 22-JUL-11 19:05:00 to 22-JUL-11 19:10:00 (MST-7)
Location: SOUTH HEART
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

This tornado touched down in the open country. There were no reports of damage associated with this tornado.