A Surface trough and associated frontal boundary extended across southeast Montana into southwest North Dakota. The initial thunderstorms formed over eastern Montana and moved into west central North Dakota. The majority of damage was done by four distinct storms.

Tornado in MCKENZIE, NORTH DAKOTA
From 30-JUN-15 16:10:00 to 30-JUN-15 16:25:00 (MST-7)
Location: FAIRVIEW
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado crossed the state line from Richland County, Montana, in the National Weather Service Glasgow, Montana, County Warning Area, into McKenzie County, North Dakota. It then crossed into Golden Valley County, North Dakota.
The total path length of the tornado was nearly 17 miles. Nearly five of those miles in Richland County, six in McKenzie County, and just over six in Golden Valley County.
No structures were impacted in North Dakota and for those segments it was rated  EF0, however, there was EF1 damage in Montana and so the overall tornado is rated EF1. A 79 year old male was injured in Montana as the mobile home he was in, and another mobile home, was damaged. From the EF1 rating, winds were determined to be around 100 mph with the tornado while it was in Montana, with lower speeds in North Dakota.
See StormData entries for this tornado from Richland County and Golden Valley County.

Tornado in GOLDEN VALLEY, NORTH DAKOTA
From 30-JUN-15 16:25:00 to 30-JUN-15 16:43:00 (MST-7)
Location: TROTTERS
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This tornado crossed the state line from Richland County, Montana, in the National Weather Service Glasgow, Montana, County Warning Area, into McKenzie County, North Dakota. It then crossed into Golden Valley County, North Dakota.
The total path length of the tornado was nearly 17 miles. Nearly five of those miles in Richland County, six in McKenzie County, and just over six in Golden Valley County.
No structures were impacted in North Dakota and for those segments it was rated EF0, however, there was EF1 damage in Montana and so the overall tornado is rated EF1. A 79 year old male was injured in Montana as the mobile home he was in, and another mobile home, was damaged. From the EF1 rating, winds were determined to be around 100 mph with the tornado while it was in Montana, with lower speeds in North Dakota.
See StormData entries for this tornado from Richland County and McKenzie County.

Hail in MCKENZIE, NORTH DAKOTA
From 30-JUN-15 16:25:00 to 30-JUN-15 16:27:00 (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 30-JUN-15 16:38:00 to 30-JUN-15 16:40:00 (MST-7)
Location: FAIRVIEW
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCKENZIE, NORTH DAKOTA
From 30-JUN-15 16:20:00 to 30-JUN-15 16:25:00 (MST-7)
Location: FAIRVIEW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GOLDEN VALLEY, NORTH DAKOTA
From 30-JUN-15 17:00:00 to 30-JUN-15 17:03:00 (MST-7)
Location: BEACH MUNI ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm wind gusts up to 60 mph were reported by the public.

Hail in SLOPE, NORTH DAKOTA
From 30-JUN-15 17:08:00 to 30-JUN-15 17:10:00 (MST-7)
Location: AMIDON
Magnitude: 3.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in SLOPE, NORTH DAKOTA
From 30-JUN-15 17:38:00 to 30-JUN-15 17:41:00 (MST-7)
Location: AMIDON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Funnel Cloud in BOWMAN, NORTH DAKOTA
From 30-JUN-15 17:45:00 to 30-JUN-15 17:47:00 (MST-7)
Location: GRIFFIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOWMAN, NORTH DAKOTA
From 30-JUN-15 17:54:00 to 30-JUN-15 17:55:00 (MST-7)
Location: BOWMAN ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOWMAN, NORTH DAKOTA
From 30-JUN-15 17:58:00 to 30-JUN-15 18:00:00 (MST-7)
Location: BOWMAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in BOWMAN, NORTH DAKOTA
From 30-JUN-15 18:30:00 to 30-JUN-15 18:35:00 (MST-7)
Location: HALEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SLOPE, NORTH DAKOTA
From 30-JUN-15 18:34:00 to 30-JUN-15 18:37:00 (MST-7)
Location: AMIDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in SLOPE, NORTH DAKOTA
From 30-JUN-15 18:51:00 to 30-JUN-15 18:53:00 (MST-7)
Location: AMIDON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GRANT, NORTH DAKOTA
From 30-JUN-15 21:00:00 to 30-JUN-15 21:04:00 (MST-7)
Location: LEITH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GRANT, NORTH DAKOTA
From 30-JUN-15 21:07:00 to 30-JUN-15 21:09:00 (MST-7)
Location: HEIL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement estimated strong thunderstorm wind gusts near Carson.

Thunderstorm Wind in MCKENZIE, NORTH DAKOTA
From 30-JUN-15 17:55:00 to 30-JUN-15 18:00:00 (MST-7)
Location: WATFORD CITY
Magnitude: 70.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two trailers of around 50 feet in length were turned over one mile north of Watford City. One trailer was moved 150 feet. In the Watford City area, a pole barn was destroyed.  The debris from the barn was lifted and thrown a thousand feet.

Thunderstorm Wind in DUNN, NORTH DAKOTA
From 30-JUN-15 18:30:00 to 30-JUN-15 18:33:00 (MST-7)
Location: KILLDEER
Magnitude: 65.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Several large trees were downed.

Tornado in BOWMAN, NORTH DAKOTA
From 30-JUN-15 18:24:00 to 30-JUN-15 18:30:00 (MST-7)
Location: BOWMAN ARPT
Tornado F-scale: EF1
Property damage: 165.00K
Crop damage: 75.00K
Reported by: Storm Chaser

This tornado crossed the state line from Bowman County, North Dakota, into Harding County, South Dakota, in the National Weather Service Rapid City County Warning Area.
The total path length of the tornado was nearly four miles. In Bowman County it was on the ground for a little more than two and a half miles and in Harding County for about a mile and a quarter.
In North Dakota the tornado did damage on a farm near 45.96 north latitude and 103.41 west longitude, about one mile north of the county and state line. On that farm outbuildings and fences were damaged and trees were uprooted. The farm house had shingles torn from the roof. Also, 21 wooden power poles were damaged to varying degree. The tornado damage corresponded to higher end EF1 and from that wind speeds were estimated to be around 105 mph. In South Dakota the tornado impacted no structures and for that segment it was rated EF0, with lower wind speeds. The overall tornado is rated EF1.
See StormData entries for this tornado from Harding County.