A stationary front and a moist and unstable atmosphere provided the focus for strong thunderstorms to develop and move through far eastern Montana. A supercell thunderstorm caused significant hail damage in the Sidney, MT area.  As the storm moved southeast, a tornado formed in a rural area and traveled into North Dakota.  The tornado injured a 79 year old man.

Hail in DAWSON, MONTANA
From 30-JUN-15 18:42:00 to 30-JUN-15 18:42:00 (MST-7)
Location: RICHEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Thunderstorm Wind in DAWSON, MONTANA
From 30-JUN-15 18:42:00 to 30-JUN-15 18:42:00 (MST-7)
Location: RICHEY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated a wind gust of 55-60 mph.

Tornado in RICHLAND, MONTANA
From 30-JUN-15 15:59:00 to 30-JUN-15 16:10:00 (MST-7)
Location: CRANE
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The National Weather Service in Glasgow, along with Richland County Disaster and Emergency Services conducted a damage survey of a property.  The mobile home and its associated storage building (also a mobile home) were thrown from its foundation. The primary home lost its metal frame and was thrown onto a storage shed to the southwest, about 60 feet to the southwest. The two mobile homes, which did not appear to have been strapped down, were overturned and one had the entire frame bent and twisted. While there were tree branches broken in the region, the most significant damage was on this property site, due to the rural nature of the area.  Power poles on the property were not damaged, although the lines were snapped.
One 79 year old gentleman was in the home with his dog also on the property.  The gentleman was in the mobile home and suffered injuries requiring transport to a local and then regional hospital.   The dog was found trapped under rubble but was ok.
Based off of the damage that was observed, the winds were estimated at 100 mph.     The tornado continued through rural area to the south-southeast where it went into North Dakota about 5 miles south-southeast of the property site with the damage.  No reported damage has been noted in North Dakota and the tornado dissipated south-southwest of Trotters.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:27:00 to 30-JUN-15 15:27:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported mostly dime-sized hail mixed with some golf ball sized hail stones along with heavy rain and winds up to 35 mph.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:55:00 to 30-JUN-15 16:03:00 (MST-7)
Location: SIDNEY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail continued through the town of Sidney and went south-southeast of town.  There was some damage to vehicles and gardens and crops in the area, but the extent was unknown.

Hail in WIBAUX, MONTANA
From 30-JUN-15 17:12:00 to 30-JUN-15 17:12:00 (MST-7)
Location: BEAVER HILL DOT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported nickel-sized hail.

Hail in WIBAUX, MONTANA
From 30-JUN-15 15:32:00 to 30-JUN-15 15:32:00 (MST-7)
Location: BEAVER HILL DOT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported mainly dime-sized hail mixed with some quarter-sized hailstones along with heavy rain.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:44:00 to 30-JUN-15 15:50:00 (MST-7)
Location: SIDNEY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Richland County Emergency Manager reported half dollar sized hail.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:45:00 to 30-JUN-15 15:50:00 (MST-7)
Location: SIDNEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter-sized hail. Duration was at least 5 minutes.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:45:00 to 30-JUN-15 15:50:00 (MST-7)
Location: SIDNEY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hen egg sized hail.  Duration at least 5 minutes.

Hail in RICHLAND, MONTANA
From 30-JUN-15 15:47:00 to 30-JUN-15 15:47:00 (MST-7)
Location: SIDNEY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in DAWSON, MONTANA
From 30-JUN-15 18:30:00 to 30-JUN-15 18:30:00 (MST-7)
Location: RICHEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported mostly penny-sized hail mixed with some quarter-sized hailstones, and measured a wind gust of 52 mph.