Severe Thunderstorm Watch number 506 was in effect during this event.
A prefrontal surface trough stretched from north to south across western North Dakota and was the focus for convective initialization in the mid to late afternoon hours as subtle mid level impulses in zonal flow aloft moved into the Northern Plains.
Storms initially developed near the Canadian border over extreme southeast Saskatchewan, where the prefrontal trough intersected a surface cold front. This complex of storms remained just north of the International Border before becoming supercellular and turning southeast into far north central North Dakota. Another complex of storms developed across eastern Stark County.  Eventually the entire trough axis filled in with convection, with both right and left moving supercells spreading eastward throughout the evening. The numerous severe thunderstorms brought widespread large hail and severe thunderstorm wind gusts to many locations.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:35:00 to 30-AUG-13 19:42:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in OLIVER, NORTH DAKOTA
From 30-AUG-13 19:40:00 to 30-AUG-13 19:50:00 (CST-6)
Location: PRICE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:40:00 to 30-AUG-13 19:50:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 19:40:00 to 30-AUG-13 19:45:00 (CST-6)
Location: VELVA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:50:00 to 30-AUG-13 19:56:00 (CST-6)
Location: MANDAN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 20:00:00 to 30-AUG-13 20:10:00 (CST-6)
Location: MANDAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 20:07:00 to 30-AUG-13 20:13:00 (CST-6)
Location: MANDAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 20:09:00 to 30-AUG-13 20:15:00 (CST-6)
Location: MANDAN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 30-AUG-13 20:09:00 to 30-AUG-13 20:15:00 (CST-6)
Location: MANDAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail accompanied the strong winds.

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 20:15:00 to 30-AUG-13 20:22:00 (CST-6)
Location: KARLSRUHE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:10:00 to 30-AUG-13 20:20:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:10:00 to 30-AUG-13 20:20:00 (CST-6)
Location: BISMARCK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail accompanied the strong winds.

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:18:00 to 30-AUG-13 20:25:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:20:00 to 30-AUG-13 20:27:00 (CST-6)
Location: BISMARCK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:25:00 to 30-AUG-13 20:30:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 18:10:00 to 30-AUG-13 18:15:00 (CST-6)
Location: NEW SALEM
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in MERCER, NORTH DAKOTA
From 30-AUG-13 18:20:00 to 30-AUG-13 18:30:00 (CST-6)
Location: ZAP
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MERCER, NORTH DAKOTA
From 30-AUG-13 18:40:00 to 30-AUG-13 18:50:00 (CST-6)
Location: PICK CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:27:00 to 30-AUG-13 20:33:00 (CST-6)
Location: FT LINCOLN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:35:00 to 30-AUG-13 20:40:00 (CST-6)
Location: BISMARCK
Magnitude: 0.80 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in MORTON, NORTH DAKOTA
From 30-AUG-13 18:10:00 to 30-AUG-13 18:15:00 (CST-6)
Location: NEW SALEM
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tornado was spotted on the ground north of Interstate 94 in rural Morton County.  There was no damage reported and so the tornado was rated EF0.

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 21:10:00 to 30-AUG-13 21:20:00 (CST-6)
Location: MILROY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 21:14:00 to 30-AUG-13 21:20:00 (CST-6)
Location: TOWNER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 21:16:00 to 30-AUG-13 21:22:00 (CST-6)
Location: TOWNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 18:10:00 to 30-AUG-13 18:20:00 (CST-6)
Location: BOTTINEAU
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 18:10:00 to 30-AUG-13 18:20:00 (CST-6)
Location: BOTTINEAU ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 18:10:00 to 30-AUG-13 18:20:00 (CST-6)
Location: BOTTINEAU
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail accompanied the strong winds.

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 21:20:00 to 30-AUG-13 21:25:00 (CST-6)
Location: TOWNER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROLETTE, NORTH DAKOTA
From 30-AUG-13 18:40:00 to 30-AUG-13 18:50:00 (CST-6)
Location: SAN HAVEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to dime size hail accompanied the strong winds.

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 18:45:00 to 30-AUG-13 18:55:00 (CST-6)
Location: DOUGLAS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 18:46:00 to 30-AUG-13 18:53:00 (CST-6)
Location: DOUGLAS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 19:15:00 to 30-AUG-13 19:25:00 (CST-6)
Location: SOUTH PRAIRIE
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 19:15:00 to 30-AUG-13 19:25:00 (CST-6)
Location: SOUTH PRAIRIE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 18:52:00 to 30-AUG-13 19:00:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 19:25:00 to 30-AUG-13 19:30:00 (CST-6)
Location: SAWYER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:01:00 to 30-AUG-13 19:07:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:07:00 to 30-AUG-13 19:14:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:19:00 to 30-AUG-13 19:26:00 (CST-6)
Location: MANDAN MUNI ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 19:25:00 to 30-AUG-13 19:30:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 19:30:00 to 30-AUG-13 19:35:00 (CST-6)
Location: VELVA
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in MORTON, NORTH DAKOTA
From 30-AUG-13 17:36:00 to 30-AUG-13 17:38:00 (CST-6)
Location: GLEN ULLIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A brief funnel cloud formed near Interstate 94.

Hail in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 17:40:00 to 30-AUG-13 17:50:00 (CST-6)
Location: BOTTINEAU
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 17:40:00 to 30-AUG-13 17:50:00 (CST-6)
Location: BOTTINEAU
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail accompanied the strong winds.

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 23:15:00 to 30-AUG-13 23:20:00 (CST-6)
Location: REGAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 17:55:00 to 30-AUG-13 18:05:00 (CST-6)
Location: BOTTINEAU ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in BOTTINEAU, NORTH DAKOTA
From 30-AUG-13 17:55:00 to 30-AUG-13 18:00:00 (CST-6)
Location: BOTTINEAU ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain and small hail accompanied the strong winds.

Hail in STARK, NORTH DAKOTA
From 30-AUG-13 15:43:00 to 30-AUG-13 15:48:00 (MST-7)
Location: ANTELOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 17:00:00 to 30-AUG-13 17:07:00 (CST-6)
Location: HEBRON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 17:30:00 to 30-AUG-13 17:40:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BURLEIGH, NORTH DAKOTA
From 30-AUG-13 20:20:00 to 30-AUG-13 20:27:00 (CST-6)
Location: BISMARCK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MERCER, NORTH DAKOTA
From 30-AUG-13 16:45:00 to 30-AUG-13 16:50:00 (CST-6)
Location: ZAP
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in MCHENRY, NORTH DAKOTA
From 30-AUG-13 21:26:00 to 30-AUG-13 21:31:00 (CST-6)
Location: TOWNER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PIERCE, NORTH DAKOTA
From 30-AUG-13 21:55:00 to 30-AUG-13 22:05:00 (CST-6)
Location: SILVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PIERCE, NORTH DAKOTA
From 30-AUG-13 22:00:00 to 30-AUG-13 22:10:00 (CST-6)
Location: BALTA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-13 18:12:00 to 30-AUG-13 18:17:00 (CST-6)
Location: NEW SALEM
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 19:30:00 to 30-AUG-13 19:35:00 (CST-6)
Location: SAWYER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WARD, NORTH DAKOTA
From 30-AUG-13 18:55:00 to 30-AUG-13 19:05:00 (CST-6)
Location: DOUGLAS
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

The large hail damaged a shed, tractor, and pickup truck.