Severe Thunderstorm Watch number 458 was in effect during this event.
Strong to severe thunderstorms over northeast Montana moved into northwest North Dakota during the evening as surface low pressure advanced into the Dakotas. Thunderstorms continued to develop along an occluded front north of the low across northwest North Dakota. Several reports of large hail and severe thunderstorm winds were received.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 18:50:00 to 03-JUL-12 18:55:00 (CST-6)
Location: BONETRAILL
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The strong winds blew down a tree onto a power line.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 19:02:00 to 03-JUL-12 19:07:00 (CST-6)
Location: GRENORA
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A twenty foot tall elm tree was knocked down.

Hail in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 20:40:00 to 03-JUL-12 20:45:00 (CST-6)
Location: (ISN)SLOULIN FLD WIL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DIVIDE, NORTH DAKOTA
From 03-JUL-12 20:20:00 to 03-JUL-12 20:25:00 (CST-6)
Location: WESTBY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An estimated peak wind report was received in rural western Divide County.

Hail in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 21:10:00 to 03-JUL-12 21:15:00 (CST-6)
Location: ALAMO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DIVIDE, NORTH DAKOTA
From 03-JUL-12 21:53:00 to 03-JUL-12 21:58:00 (CST-6)
Location: ALKABO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 21:53:00 to 03-JUL-12 21:59:00 (CST-6)
Location: GRENORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts to 50 miles per hour accompanied the large hail.

Hail in DIVIDE, NORTH DAKOTA
From 03-JUL-12 23:00:00 to 03-JUL-12 23:05:00 (CST-6)
Location: CROSBY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DIVIDE, NORTH DAKOTA
From 03-JUL-12 23:15:00 to 03-JUL-12 23:20:00 (CST-6)
Location: CROSBY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DIVIDE, NORTH DAKOTA
From 03-JUL-12 23:22:00 to 03-JUL-12 23:27:00 (CST-6)
Location: CROSBY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BURKE, NORTH DAKOTA
From 03-JUL-12 23:31:00 to 03-JUL-12 23:38:00 (CST-6)
Location: COLUMBUS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This report came from a campground just south of the Canadian border.

Hail in DIVIDE, NORTH DAKOTA
From 04-JUL-12 00:35:00 to 04-JUL-12 00:41:00 (CST-6)
Location: CROSBY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 20:25:00 to 03-JUL-12 20:28:00 (CST-6)
Location: GRENORA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 03-JUL-12 19:02:00 to 03-JUL-12 19:07:00 (CST-6)
Location: GRENORA
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A cattle wind break eight feet high was flattened and a wooden calf shelter was destroyed.