An extremely unstable atmosphere combined with very strong deep layer wind shear set the stage for intense thunderstorm development. Initially, thunderstorms were supercells, and formed along a warm front that lifted through North Dakota in the afternoon and evening hours. One of the supercell thunderstorms produced flash flooding in Dunn and Mercer counties, while another produced 3.50 inch diameter hail over Wells County. During the evening and overnight hours a line of intense thunderstorms developed along a cold front that swept into western North Dakota, and tracked eastward across the state. Widespread wind damage occurred throughout much of western and central North Dakota, but the strongest winds centralized generally along and about 20 miles north and south of Highway 200, where episodes of microburst enhanced winds occurred. Within this corridor, many grain bins were lost, farm buildings and campers damaged or destroyed, and trees uprooted or snapped. The greatest wind damage occurred near Stanton, Mercer County, where a microburst with estimated 130 mph winds destroyed a farm. One fatality occurred at Heckers Lake in McLean County as an individual was outside a camper, and the camper tipped over onto him. There were also four injuries in that area around New Johns and Heckers lakes where many campers were damaged or destroyed, some being blown into the lakes.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 28-JUN-18 23:40:00 to 28-JUN-18 23:47:00 (CST-6)
Location: STANTON
Magnitude: 70.00 EG
Property damage: 300.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Numerous large tree branches were broken, and several large tree trunks snapped in the city of Stanton. A few garages had a wall blown out or parts of their roofs torn off.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 28-JUN-18 23:30:00 to 28-JUN-18 23:35:00 (CST-6)
Location: STANTON
Magnitude: 113.00 EG
Property damage: 400.00K
Crop damage: 75.00K
Reported by: NWS Storm Survey

An intense microburst occurred at this location with estimated 130 mph winds. Every building on the property was severely damaged or destroyed. The home suffered severe damage with the roof being torn off and the back wall blown out. Four people were inside the home and sought shelter in the basement, uninjured. Large diameter trees were snapped. Crops were also damaged.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:45:00 to 28-JUN-18 23:50:00 (CST-6)
Location: MERCER
Magnitude: 74.00 EG
Property damage: 350.00K
Crop damage: 0.00K
Reported by: NWS Employee

Extensive wind damage occurred in the Brush Lake and Mercer areas. Multiple metal sheds were blown over and boating docks were damaged. Large trees at Brush Lake were snapped and uprooted. Multiple campers were heavily damaged.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUN-18 01:45:00 to 29-JUN-18 01:50:00 (CST-6)
Location: STREETER
Magnitude: 70.00 EG
Property damage: 90.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees were uprooted and other snapped in Streeter. Damage also occurred to buildings.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUN-18 01:45:00 to 29-JUN-18 01:50:00 (CST-6)
Location: CLEVELAND
Magnitude: 65.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Public

Two grain bins were blown over.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:50:00 to 28-JUN-18 23:58:00 (CST-6)
Location: FALKIRK
Magnitude: 83.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Half of a metal outbuilding on a farm was torn off. About ten wooden power poles in the vicinity were broken.

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUN-18 01:34:00 to 29-JUN-18 01:38:00 (CST-6)
Location: STREETER
Magnitude: 70.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Public

Multiple large evergreen trees were blown over and power lines were down. A house was damaged from a fallen tree. A wall was blown in on a storage building used as a greenhouse at the grocery store.

Hail in WELLS, NORTH DAKOTA
From 28-JUN-18 19:47:00 to 28-JUN-18 19:52:00 (CST-6)
Location: HARVEY
Magnitude: 3.50 
Property damage: 40.00K
Crop damage: 10.00K
Reported by: Trained Spotter

There was damage to the gutters, siding, and roof of the home and other farm buildings. Crop damage was minimal as there was no wind with the hail.

Hail in WELLS, NORTH DAKOTA
From 28-JUN-18 19:55:00 to 28-JUN-18 20:15:00 (CST-6)
Location: HARVEY
Magnitude: 3.00 
Property damage: 850.00K
Crop damage: 100.00K
Reported by: Broadcast Media

A slow moving supercell thunderstorm dropped very large hail on the Harvey area. House roofs and gutters were damaged throughout the city. Many vehicles were damaged with windshields and back windows shattered. Crops were damaged, though most were expected to rebound as the plants were young enough to do so.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 28-JUN-18 23:25:00 to 28-JUN-18 23:29:00 (CST-6)
Location: PICK CITY
Magnitude: 74.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A medium sized wooden outbuilding on a farm was shifted off its foundation, while its front door was torn off and back wall was blown out.

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 28-JUN-18 23:35:00 to 28-JUN-18 23:40:00 (CST-6)
Location: STANTON
Magnitude: 74.00 EG
Property damage: 150.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A large wooden barn  was completely destroyed.

Hail in MCKENZIE, NORTH DAKOTA
From 28-JUN-18 14:32:00 to 28-JUN-18 14:35:00 (MST-7)
Location: ARNEGARD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in DUNN, NORTH DAKOTA
From 28-JUN-18 18:59:00 to 28-JUN-18 19:01:00 (MST-7)
Location: HALLIDAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 28-JUN-18 19:40:00 to 28-JUN-18 19:43:00 (MST-7)
Location: ALEXANDER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law Enforcement estimated thunderstorm wind gusts of 65 mph.

Hail in DUNN, NORTH DAKOTA
From 28-JUN-18 19:45:00 to 28-JUN-18 19:48:00 (MST-7)
Location: HALLIDAY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WELLS, NORTH DAKOTA
From 28-JUN-18 19:48:00 to 28-JUN-18 19:51:00 (CST-6)
Location: HARVEY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:15:00 to 29-JUN-18 00:19:00 (CST-6)
Location: BISMARCK
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:27:00 to 29-JUN-18 00:31:00 (CST-6)
Location: BISMARCK
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The Broadcast Media estimated thunderstorm wind gusts of 75 mph.

Hail in DUNN, NORTH DAKOTA
From 28-JUN-18 19:48:00 to 28-JUN-18 19:52:00 (MST-7)
Location: HALLIDAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Funnel Cloud in WELLS, NORTH DAKOTA
From 28-JUN-18 19:50:00 to 28-JUN-18 19:52:00 (CST-6)
Location: HARVEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:30:00 to 29-JUN-18 00:35:00 (CST-6)
Location: BISMARCK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A fence was damaged and parts of an eight inch diameter tree broke off.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:35:00 to 29-JUN-18 00:39:00 (CST-6)
Location: (BIS)BISMARCK MUNI A
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 28-JUN-18 19:57:00 to 28-JUN-18 20:00:00 (MST-7)
Location: WATFORD CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement estimated thunderstorm wind gusts of 70 mph.

Hail in DUNN, NORTH DAKOTA
From 28-JUN-18 20:06:00 to 28-JUN-18 20:09:00 (MST-7)
Location: HALLIDAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:47:00 to 29-JUN-18 00:51:00 (CST-6)
Location: MOFFIT
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 01:03:00 to 29-JUN-18 01:08:00 (CST-6)
Location: STERLING
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 20:11:00 to 28-JUN-18 20:14:00 (CST-6)
Location: WHEELOCK
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 28-JUN-18 20:15:00 to 28-JUN-18 20:18:00 (MST-7)
Location: WATFORD CITY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in WELLS, NORTH DAKOTA
From 29-JUN-18 01:06:00 to 29-JUN-18 01:11:00 (CST-6)
Location: HARVEY
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUN-18 01:45:00 to 29-JUN-18 01:49:00 (CST-6)
Location: PINGREE
Magnitude: 65.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

A horse trailer was totaled.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 20:25:00 to 28-JUN-18 20:28:00 (CST-6)
Location: TRENTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Williams County Emergency Manager estimated thunderstorm wind gusts of 65 mph.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 20:29:00 to 28-JUN-18 20:32:00 (CST-6)
Location: TRENTON
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in STUTSMAN, NORTH DAKOTA
From 29-JUN-18 01:50:00 to 29-JUN-18 01:55:00 (CST-6)
Location: MEDINA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire Department Officials estimated thunderstorm wind gusts of 65 mph.

Thunderstorm Wind in WELLS, NORTH DAKOTA
From 29-JUN-18 01:02:00 to 29-JUN-18 01:09:00 (CST-6)
Location: HARVEY
Magnitude: 65.00 EG
Property damage: 20.00K
Crop damage: 10.00K
Reported by: NWS Employee

A grain bin was dislodged and blown into the surrounding bins. Canola crop was pushed down by the strong winds.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 20:38:00 to 28-JUN-18 20:41:00 (CST-6)
Location: (ISN)SLOULIN FLD WIL
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in BILLINGS, NORTH DAKOTA
From 28-JUN-18 20:48:00 to 28-JUN-18 20:52:00 (MST-7)
Location: FRYBURG
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in WELLS, NORTH DAKOTA
From 29-JUN-18 01:02:00 to 29-JUN-18 01:09:00 (CST-6)
Location: HARVEY
Magnitude: 70.00 EG
Property damage: 80.00K
Crop damage: 0.00K
Reported by: Public

Three grain bins became dislodged and blew around the farm yard.  One became wedged against the house.

Funnel Cloud in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 20:51:00 to 28-JUN-18 20:54:00 (CST-6)
Location: ZAHL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 21:09:00 to 28-JUN-18 21:12:00 (CST-6)
Location: RAY
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Flash Flood in DUNN, NORTH DAKOTA
From 28-JUN-18 20:25:00 to 28-JUN-18 23:25:00 (MST-7)
Location: HALLIDAY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 25.00K
Reported by: Trained Spotter

A slow moving thunderstorm produced torrential rain over eastern Dunn County and  western Mercer County. Over five inches of rain fell over some locations causing creeks to come out of their banks and overland flooding to develop. Deep water was running across North Dakota Highway 8. The water damaged crops.

Flash Flood in MERCER, NORTH DAKOTA
From 28-JUN-18 21:25:00 to 29-JUN-18 00:25:00 (CST-6)
Location: GOLDEN VLY
Flood cause: Heavy Rain
Property damage: 8.00K
Crop damage: 15.00K
Reported by: Trained Spotter

A slow moving thunderstorm produced heavy rain over eastern Dunn County and  western Mercer County. Over five inches of rain fell over some locations causing creeks to come out of their banks and overland flooding to develop. Water was running across North Dakota Highway 1806 in Mercer County. Crops were damaged by the water.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 21:11:00 to 28-JUN-18 21:15:00 (CST-6)
Location: WHEELOCK
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 28-JUN-18 21:12:00 to 28-JUN-18 21:17:00 (MST-7)
Location: DUNN CENTER
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Flash Flood in MCLEAN, NORTH DAKOTA
From 28-JUN-18 22:53:00 to 29-JUN-18 02:53:00 (CST-6)
Location: ROSEGLEN
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Public

Over seven inches of rain fell in the Roseglen and White Shield areas. This led to water flowing through the lower areas of these communities. Damage was described as minor and confined to a few basements. The terrain, very hilly, allowed water to flow into lower areas where there were few if any structures, and away from buildings.

Thunderstorm Wind in STARK, NORTH DAKOTA
From 28-JUN-18 21:33:00 to 28-JUN-18 21:36:00 (MST-7)
Location: DICKINSON
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

A tall tree blew over onto a truck.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 21:15:00 to 28-JUN-18 21:19:00 (CST-6)
Location: RAY
Magnitude: 65.00 EG
Property damage: 70.00K
Crop damage: 0.00K
Reported by: Public

Siding was torn off homes in Ray.

Hail in BOWMAN, NORTH DAKOTA
From 28-JUN-18 21:15:00 to 28-JUN-18 21:19:00 (MST-7)
Location: RHAME
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 28-JUN-18 23:20:00 to 28-JUN-18 23:25:00 (CST-6)
Location: HEBRON
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Branches were down in Hebron.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:30:00 to 28-JUN-18 23:35:00 (CST-6)
Location: UNDERWOOD
Magnitude: 75.00 EG
Property damage: 110.00K
Crop damage: 0.00K
Reported by: Public

A large swath of power poles along Highway 85 were snapped.

Thunderstorm Wind in WILLIAMS, NORTH DAKOTA
From 28-JUN-18 21:30:00 to 28-JUN-18 21:34:00 (CST-6)
Location: TIOGA
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public estimated thunderstorm wind gusts of 75 mph.

Thunderstorm Wind in GRANT, NORTH DAKOTA
From 28-JUN-18 22:41:00 to 28-JUN-18 22:44:00 (MST-7)
Location: ELGIN MUNI ARPT
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 28-JUN-18 23:02:00 to 28-JUN-18 23:06:00 (CST-6)
Location: GLEN ULLIN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public estimated thunderstorm wind gusts of 60 mph.

Thunderstorm Wind in MCHENRY, NORTH DAKOTA
From 28-JUN-18 23:12:00 to 28-JUN-18 23:16:00 (CST-6)
Location: SIMCOE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MERCER, NORTH DAKOTA
From 28-JUN-18 23:15:00 to 28-JUN-18 23:20:00 (CST-6)
Location: STANTON
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MORTON, NORTH DAKOTA
From 28-JUN-18 23:33:00 to 28-JUN-18 23:37:00 (CST-6)
Location: NEW SALEM
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in OLIVER, NORTH DAKOTA
From 28-JUN-18 23:30:00 to 28-JUN-18 23:35:00 (CST-6)
Location: CENTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:48:00 to 28-JUN-18 23:55:00 (CST-6)
Location: WASHBURN
Magnitude: 71.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:50:00 to 28-JUN-18 23:59:00 (CST-6)
Location: WASHBURN
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees and power lines were down.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 28-JUN-18 23:53:00 to 28-JUN-18 23:57:00 (CST-6)
Location: TURTLE LAKE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 29-JUN-18 00:00:00 to 29-JUN-18 00:08:00 (CST-6)
Location: MERCER
Magnitude: 70.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

About 30 camping trailers at Heckers Lake and New Johns Lake were damaged and destroyed, with many overturned. Some of the campers came to rest in the water. One fatality occurred at Heckers Lake as an individual was outside his camper, and the camper blew over onto him. Four injuries were also reported in the camping areas
around New Johns and Heckers Lakes.

Thunderstorm Wind in MCLEAN, NORTH DAKOTA
From 29-JUN-18 00:00:00 to 29-JUN-18 00:05:00 (CST-6)
Location: WASHBURN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law Enforcement estimated thunderstorm wind gusts of 60 mph.

Thunderstorm Wind in BURLEIGH, NORTH DAKOTA
From 29-JUN-18 00:09:00 to 29-JUN-18 00:13:00 (CST-6)
Location: BALDWIN
Magnitude: 65.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Extensive tree damage was reported to the south of Double Ditch Indian Village State Historic Site.