A complex and lengthy severe weather event occurred over west and central North Dakota starting in the morning of Friday, August 10th, and lasting into the early morning hours of Saturday, August 11th.
Scattered severe thunderstorms continuously redeveloped over the area along a surface trough that was oriented from southwest to northeast, from around Dickinson, to near Grand Forks. Convection was also supported by a favorable overrunning situation when the southerly low level jet intensified and persisted. Numerous warnings were issued, and numerous severe weather reports were received.
Severe Thunderstorm Watch 582 was issued due to ongoing convection and in anticipation of future development/intensification across south central North Dakota.
Late in the afternoon on Friday, Severe Thunderstorm Watch 584 was issued for all of western and much of central North Dakota. Storms were expected to reintensify during the evening and spread east as large scale upper level support and a cold front approached.

Hail in WILLIAMS, NORTH DAKOTA
From 10-AUG-07 21:10:00 to 10-AUG-07 21:30:00 (CST-6)
Location: RAY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

This was a prolonged period of hail with the largest stones 1.75 inch diameter.

Hail in MCLEAN, NORTH DAKOTA
From 10-AUG-07 10:04:00 to 10-AUG-07 10:12:00 (CST-6)
Location: RIVERDALE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Funnel Cloud in EMMONS, NORTH DAKOTA
From 10-AUG-07 17:53:00 to 10-AUG-07 18:28:00 (CST-6)
Location: LINTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chasers and law enforcement report multiple funnels over southwest Emmons County.

Hail in SIOUX, NORTH DAKOTA
From 10-AUG-07 16:51:00 to 10-AUG-07 17:03:00 (MST-7)
Location: FT YATES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in SIOUX, NORTH DAKOTA
From 10-AUG-07 17:03:00 to 10-AUG-07 17:10:00 (MST-7)
Location: SELFRIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 11-AUG-07 01:01:00 to 11-AUG-07 01:05:00 (CST-6)
Location: BISMARCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in MORTON, NORTH DAKOTA
From 10-AUG-07 23:58:00 to 11-AUG-07 00:35:00 (CST-6)
Location: HEBRON
Magnitude: 2.75 
Property damage: 40.00K
Crop damage: 40.00K
Reported by: Newspaper

Newspaper and trained spotters reported golf ball to baseball sized hail from 1 mile south of Hebron to 3 miles south of Glen Ullin from the same storm as it tracked east. Damage sustained to vehicles, other  property, and crops.

Hail in ROLETTE, NORTH DAKOTA
From 10-AUG-07 07:46:00 to 10-AUG-07 07:52:00 (CST-6)
Location: ROLETTE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 11-AUG-07 01:54:00 to 11-AUG-07 02:04:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Hail in MCLEAN, NORTH DAKOTA
From 10-AUG-07 11:24:00 to 10-AUG-07 11:30:00 (CST-6)
Location: BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PIERCE, NORTH DAKOTA
From 10-AUG-07 11:30:00 to 10-AUG-07 11:50:00 (CST-6)
Location: RUGBY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to nickel size lasted 20 minutes.

Hail in MCHENRY, NORTH DAKOTA
From 10-AUG-07 11:45:00 to 10-AUG-07 11:57:00 (CST-6)
Location: DRAKE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, NORTH DAKOTA
From 10-AUG-07 10:30:00 to 10-AUG-07 10:45:00 (CST-6)
Location: RIVERDALE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in MCHENRY, NORTH DAKOTA
From 10-AUG-07 11:00:00 to 10-AUG-07 11:09:00 (CST-6)
Location: BALFOUR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, NORTH DAKOTA
From 10-AUG-07 11:17:00 to 10-AUG-07 11:22:00 (CST-6)
Location: RIVERDALE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in SHERIDAN, NORTH DAKOTA
From 10-AUG-07 09:42:00 to 10-AUG-07 09:50:00 (CST-6)
Location: GOODRICH
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WELLS, NORTH DAKOTA
From 10-AUG-07 10:24:00 to 10-AUG-07 10:39:00 (CST-6)
Location: HARVEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm Wind in DIVIDE, NORTH DAKOTA
From 10-AUG-07 22:30:00 to 10-AUG-07 22:35:00 (CST-6)
Location: NOONAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 11-AUG-07 00:48:00 to 11-AUG-07 00:53:00 (CST-6)
Location: NEW SALEM
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 10-AUG-07 22:40:00 to 10-AUG-07 22:50:00 (CST-6)
Location: TIOGA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in BURLEIGH, NORTH DAKOTA
From 11-AUG-07 01:35:00 to 11-AUG-07 01:40:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Wind gusts of 51 mph were also measured at Bismarck Municipal Airport.

Thunderstorm Wind in DIVIDE, NORTH DAKOTA
From 10-AUG-07 21:45:00 to 10-AUG-07 21:55:00 (CST-6)
Location: CROSBY
Magnitude: 78.00 EG
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Public

Tree limbs 10 to 12 inches in diameter were snapped. Part of a pool hall roof was blown off. Several buildings doors were torn off.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 10-AUG-07 22:30:00 to 10-AUG-07 22:42:00 (CST-6)
Location: MC GREGOR
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The wind snapped a 10 inch diameter tree half way up.

Hail in LOGAN, NORTH DAKOTA
From 10-AUG-07 15:45:00 to 10-AUG-07 15:55:00 (CST-6)
Location: NAPOLEON
Magnitude: 2.50 
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Newspaper

Windows were broken on cars and there was other property damage.

Hail in MORTON, NORTH DAKOTA
From 11-AUG-07 01:00:00 to 11-AUG-07 01:15:00 (CST-6)
Location: HEBRON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 10.00K
Reported by: Trained Spotter

The hail was accompanied by 50 to 55 mph winds.

Hail in KIDDER, NORTH DAKOTA
From 11-AUG-07 02:38:00 to 11-AUG-07 02:49:00 (CST-6)
Location: STEELE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Penny sized hail covered the ground. The storm also produced heavy rain and estimated 50 mph winds.

Tornado in WILLIAMS, NORTH DAKOTA
From 10-AUG-07 22:04:00 to 10-AUG-07 22:15:00 (CST-6)
Location: ALAMO
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Airplane Pilot

This tornado was sighted by a weather modification pilot. The tornado hit no structures.

Hail in SIOUX, NORTH DAKOTA
From 10-AUG-07 16:30:00 to 10-AUG-07 16:48:00 (MST-7)
Location: FT YATES
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

This was a prolonged period of hail with the largest stones 0.88 inch diameter.

Hail in MCLEAN, NORTH DAKOTA
From 10-AUG-07 10:04:00 to 10-AUG-07 10:19:00 (CST-6)
Location: BUTTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 50.00K
Reported by: Newspaper

Crop damage from the hail was reported.