As surface dewpoints from the southwest reached 70 degrees and daytime temperatures soared above 90 degrees, a lee-side surface trough of low pressure focused the development of thunderstorms with very strong updrafts.  One particular super-cell thunderstorm displayed textbook features and characteristics which spawned a Tornado which moved eastward across northern Roosevelt county.  Tornado damage survey conducted the following morning resulted in an EF-2 rating.

Hail in ROOSEVELT, MONTANA
From 15-JUL-13 15:55:00 to 15-JUL-13 15:55:00 (MST-7)
Location: BREDETTE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Hail in ROOSEVELT, MONTANA
From 15-JUL-13 19:15:00 to 15-JUL-13 19:15:00 (MST-7)
Location: ND STATELINE HWY 2 DOT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter-sized hail.

Thunderstorm Wind in SHERIDAN, MONTANA
From 15-JUL-13 16:58:00 to 15-JUL-13 16:58:00 (MST-7)
Location: MEDICINE LAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts up to 60 mph.

Hail in DANIELS, MONTANA
From 15-JUL-13 15:00:00 to 15-JUL-13 15:00:00 (MST-7)
Location: SCOBEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Cooperative observer reported quarter-sized hail.

Hail in DANIELS, MONTANA
From 15-JUL-13 15:00:00 to 15-JUL-13 15:00:00 (MST-7)
Location: FOUR BUTTES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported golf ball sized hail.

Tornado in ROOSEVELT, MONTANA
From 15-JUL-13 14:45:00 to 15-JUL-13 15:50:00 (MST-7)
Location: VOLT
Tornado F-scale: EF2
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado was first spotted about 19 miles north of Wolf Point and the NWS Storm Damage Team found downed tree limbs and a de-barked tree trunk.  As it moved eastward, the tornado rolled heavy hay bails, snapped a road-sign post and flipped a loose yard shed.  A few miles west of the Poplar River and just north of County Road 2042, the Beck Farm sustained the most damage involving roofs peeled away and blown off of several farm and storage buildings.  Winds here were estimated at 115 to 120 mph.  After crossing over the Poplar River, the tornado downed a large cottonwood tree, lifted and moved irrigation pipes, and snapped 9 power poles, then dissipated near the intersection of County Roads 2041 and 1041, about 17 miles north of Poplar.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 15-JUL-13 15:45:00 to 15-JUL-13 15:45:00 (MST-7)
Location: BREDETTE
Magnitude: 104.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A well built, newer Morton Building had part of the roof peeled off by rear-flank downdraft winds from a tornadic supercell. The EF-2 tornado was two miles south of this location.

Hail in DANIELS, MONTANA
From 15-JUL-13 15:10:00 to 15-JUL-13 15:10:00 (MST-7)
Location: WHITETAIL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

DHS at the Port of Scobey reported quarter-sized hail.

Hail in ROOSEVELT, MONTANA
From 15-JUL-13 18:30:00 to 15-JUL-13 18:30:00 (MST-7)
Location: CULBERTSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 15-JUL-13 14:55:00 to 15-JUL-13 14:55:00 (MST-7)
Location: VOLT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported crop damage from a severe thunderstorm.

Hail in SHERIDAN, MONTANA
From 15-JUL-13 17:22:00 to 15-JUL-13 17:22:00 (MST-7)
Location: HOMESTEAD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported penny-sized hail and 40 mph winds.