A few thunderstorms developed during the late morning hours over central North Dakota where southerly low level flow increased instability, and deep layer shear was elevated. Initially, a nearly stationary supercell developed over Oliver County. The storm produced large hail and damaging wind gusts, along with torrential rain that led to flash flooding and damaging gravel roads. The storm eventually started moving to the south-southeast, continuing to produce severe weather in its path. Substantial damage occurred in Morton County north and east of the city of Flasher where hail up to the size of baseballs and wind gusts estimated to 80 mph severely damaged homes and vehicles, and overturned a semi-truck. Additional storms developed in the area. One intense supercell thunderstorm moved through Hettinger and Adams counties producing three inch diameter hail that destroyed crops and greatly damaged buildings and vehicles.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 16:34:00 to 30-AUG-21 16:37:00 (CST-6)
Location: FLASHER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ADAMS, NORTH DAKOTA
From 30-AUG-21 16:50:00 to 30-AUG-21 17:20:00 (MST-7)
Location: HAYNES
Magnitude: 3.00 
Property damage: 350.00K
Crop damage: 400.00K
Reported by: Public

A long lived supercell thunderstorm produced a path of destruction near Haynes. At one farm, large hail punched many holes through the metal roofs on pole barns and also into a hot-tub cover. Five vehicles were substantially damaged. Windows were broken on pole barns, and an exhaust vent for a pole barn furnace was busted off. To the south-southeast the destruction continued, with very large hail continuing to fall. In addition, strong thunderstorm winds accompanied the hail, shredding a field of lush eight foot tall corn, which was considered some of the nicest in the county, down to knee high.

Hail in MCLEAN, NORTH DAKOTA
From 30-AUG-21 16:55:00 to 30-AUG-21 16:58:00 (CST-6)
Location: EMMET
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 30-AUG-21 16:50:00 to 30-AUG-21 16:58:00 (CST-6)
Location: FLASHER
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A semi-truck and trailer were blown over by thunderstorm winds. The very strong winds continued for a few minutes after the truck blew over.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 17:05:00 to 30-AUG-21 17:15:00 (CST-6)
Location: FLASHER
Magnitude: 2.75 
Property damage: 400.00K
Crop damage: 750.00K
Reported by: Trained Spotter

Very large hail combined with wind gusts to cause extensive damage. At one farmstead, all windows were broken out of the north side of two homes. Steel siding was dented on one home, and vinyl siding was destroyed on the other. Five vehicles had their windows broken. Crops were flattened and trees were stripped of leaves. Other farmsteads in the area also had broken windows in their homes, and destroyed crops.

Flash Flood in OLIVER, NORTH DAKOTA
From 30-AUG-21 11:15:00 to 30-AUG-21 13:15:00 (CST-6)
Location: HANNOVER
Flood cause: Heavy Rain
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Over four inches of rain falling from a slow moving thunderstorm led to flash flooding. Rural roads had water flowing over them, washing gravel away and making them impassable.

Hail in OLIVER, NORTH DAKOTA
From 30-AUG-21 11:14:00 to 30-AUG-21 11:17:00 (CST-6)
Location: HANNOVER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, NORTH DAKOTA
From 30-AUG-21 12:30:00 to 30-AUG-21 12:33:00 (CST-6)
Location: HAZEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 12:40:00 to 30-AUG-21 12:43:00 (CST-6)
Location: NEW SALEM
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MERCER, NORTH DAKOTA
From 30-AUG-21 12:45:00 to 30-AUG-21 12:48:00 (CST-6)
Location: BEULAH
Magnitude: 1.75 
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Public

A pickup truck was damaged.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 13:11:00 to 30-AUG-21 13:14:00 (CST-6)
Location: NEW SALEM
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 13:24:00 to 30-AUG-21 13:26:00 (CST-6)
Location: JUDSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 13:25:00 to 30-AUG-21 13:29:00 (CST-6)
Location: JUDSON
Magnitude: 2.75 
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Multiple homes in the area were heavily damaged, which included broken windows and destroyed siding. In addition, a few campers were also damaged.

Hail in GRANT, NORTH DAKOTA
From 30-AUG-21 14:51:00 to 30-AUG-21 14:55:00 (MST-7)
Location: LARK
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MCLEAN, NORTH DAKOTA
From 30-AUG-21 15:00:00 to 30-AUG-21 15:04:00 (CST-6)
Location: EMMET
Magnitude: 1.25 
Property damage: 20.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Multiple vehicles were damaged. A canola crop was severely damaged.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 15:05:00 to 30-AUG-21 15:10:00 (CST-6)
Location: SWEET BRIAR
Magnitude: 2.25 
Property damage: 0.00K
Crop damage: 50.00K
Reported by: Public

A soybean crop was destroyed.

Hail in HETTINGER, NORTH DAKOTA
From 30-AUG-21 15:11:00 to 30-AUG-21 15:14:00 (MST-7)
Location: REGENT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 15:18:00 to 30-AUG-21 15:22:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 15:50:00 to 30-AUG-21 15:54:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HETTINGER, NORTH DAKOTA
From 30-AUG-21 15:53:00 to 30-AUG-21 16:00:00 (MST-7)
Location: REGENT
Magnitude: 3.00 
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Public

Vehicles were severely damaged, which included broken windshields.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 15:55:00 to 30-AUG-21 15:58:00 (CST-6)
Location: ALMONT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in OLIVER, NORTH DAKOTA
From 30-AUG-21 10:00:00 to 30-AUG-21 10:03:00 (CST-6)
Location: HANNOVER
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

An unattached porch was tipped over.

Hail in MORTON, NORTH DAKOTA
From 30-AUG-21 16:30:00 to 30-AUG-21 16:33:00 (CST-6)
Location: JUDSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter