Thunderstorms developed in the vicinity of a warm front over southwest North Dakota where strong instability and deep layer shear had developed, then spread northeast. Initial storms produced a combination of large hail and strong wind gusts, while later storms produced primarily strong wind gusts resulting in many reports of property damage, particularly near New Town in Mountrail and McKenzie counties. The largest hail was the size of golf balls, and occurred in Dunn and McKenzie counties. The strongest wind gust was 84 mph, which occurred near Grassy Butte in McKenzie County.

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 17:16:00 to 29-JUN-20 17:19:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 73.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in BILLINGS, NORTH DAKOTA
From 29-JUN-20 17:20:00 to 29-JUN-20 17:23:00 (MST-7)
Location: FAIRFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 17:22:00 to 29-JUN-20 17:24:00 (MST-7)
Location: WATFORD CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Airplane Pilot

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 29-JUN-20 17:32:00 to 29-JUN-20 17:35:00 (MST-7)
Location: KILLDEER
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in HETTINGER, NORTH DAKOTA
From 29-JUN-20 18:17:00 to 29-JUN-20 18:20:00 (MST-7)
Location: NEW ENGLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 18:46:00 to 29-JUN-20 18:49:00 (MST-7)
Location: CHARLSON
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 16:22:00 to 29-JUN-20 16:25:00 (MST-7)
Location: FAIRVIEW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 17:03:00 to 29-JUN-20 17:06:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, NORTH DAKOTA
From 29-JUN-20 17:05:00 to 29-JUN-20 17:09:00 (MST-7)
Location: KILLDEER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 17:14:00 to 29-JUN-20 17:17:00 (MST-7)
Location: GRASSY BUTTE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUN-20 19:24:00 to 29-JUN-20 19:27:00 (CST-6)
Location: NEW TOWN
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chaser estimated 80 mph wind gusts.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUN-20 19:40:00 to 29-JUN-20 19:45:00 (CST-6)
Location: SANISH
Magnitude: 74.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Twenty five power poles were either damaged, broken, or leaning. At one point 1,300 electrical meters were without power.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUN-20 19:40:00 to 29-JUN-20 19:43:00 (CST-6)
Location: NEW TOWN
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUN-20 20:22:00 to 29-JUN-20 20:25:00 (CST-6)
Location: SANISH
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous tree branches larger than six inches in diameter were broken.

Thunderstorm Wind in MOUNTRAIL, NORTH DAKOTA
From 29-JUN-20 20:25:00 to 29-JUN-20 20:29:00 (CST-6)
Location: SANISH
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: NWS Employee

A large machine shed had its metal doors pushed in and damaged by the strong winds.

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 29-JUN-20 18:40:00 to 29-JUN-20 18:45:00 (MST-7)
Location: CHARLSON
Magnitude: 74.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A boat was blown off a trailer onto the parking lot at Four Bears Casino.