A strong surface cold front, coinciding with cooling air aloft as an upper level trough approached the northern plains, triggered thunderstorms throughout the evening hours of the 21st and the early morning hours of the 22nd. Multiple severe thunderstorm warnings and several tornado warnings were issued. Reports of large hail and severe thunderstorm wind gusts were received.

Thunderstorm Wind in WARD, NORTH DAKOTA
From 21-AUG-08 17:30:00 to 21-AUG-08 17:40:00 (CST-6)
Location: MAKOTI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in STARK, NORTH DAKOTA
From 21-AUG-08 19:04:00 to 21-AUG-08 19:11:00 (MST-7)
Location: DICKINSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in STARK, NORTH DAKOTA
From 21-AUG-08 19:05:00 to 21-AUG-08 19:11:00 (MST-7)
Location: DICKINSON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in STARK, NORTH DAKOTA
From 21-AUG-08 19:24:00 to 21-AUG-08 19:29:00 (MST-7)
Location: BOYLE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROLETTE, NORTH DAKOTA
From 21-AUG-08 19:25:00 to 21-AUG-08 19:55:00 (CST-6)
Location: ROLETTE ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail up to the size of nickels fell for thirty minutes.

Hail in MCHENRY, NORTH DAKOTA
From 21-AUG-08 19:29:00 to 21-AUG-08 19:35:00 (CST-6)
Location: ANAMOOSE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in STARK, NORTH DAKOTA
From 21-AUG-08 20:00:00 to 21-AUG-08 20:09:00 (MST-7)
Location: ANTELOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BILLINGS, NORTH DAKOTA
From 21-AUG-08 20:20:00 to 21-AUG-08 20:26:00 (MST-7)
Location: MEDORA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in STARK, NORTH DAKOTA
From 21-AUG-08 21:12:00 to 21-AUG-08 21:22:00 (MST-7)
Location: LEHIGH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in OLIVER, NORTH DAKOTA
From 21-AUG-08 21:30:00 to 21-AUG-08 21:36:00 (CST-6)
Location: CENTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in MCLEAN, NORTH DAKOTA
From 21-AUG-08 21:55:00 to 21-AUG-08 22:03:00 (CST-6)
Location: WASHBURN ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in STARK, NORTH DAKOTA
From 21-AUG-08 23:40:00 to 21-AUG-08 23:46:00 (MST-7)
Location: RICHARDTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in BILLINGS, NORTH DAKOTA
From 21-AUG-08 18:50:00 to 21-AUG-08 19:01:00 (MST-7)
Location: GORHAM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail was accompanied by estimated 60 mph winds.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 22-AUG-08 01:35:00 to 22-AUG-08 01:43:00 (CST-6)
Location: WASHBURN
Magnitude: 65.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Severe thunderstorm winds blew down three large cotton wood trees at Fort Mandan.