A vigorous upper level storm system and strong cold front produced a widespread severe weather outbreak in northeastern Montana.  The majority of the events were high wind, a few reports of large hail, and two tornadoes.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 18:50:00 to 10-AUG-07 18:50:00 (MST-7)
Location: POPLAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in VALLEY, MONTANA
From 10-AUG-07 18:50:00 to 10-AUG-07 18:50:00 (MST-7)
Location: OPHEIM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in VALLEY, MONTANA
From 10-AUG-07 18:54:00 to 10-AUG-07 19:09:00 (MST-7)
Location: GLENTANA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail ranged in size from nickel to quarter.

Hail in PHILLIPS, MONTANA
From 10-AUG-07 17:00:00 to 10-AUG-07 17:00:00 (MST-7)
Location: WHITEWATER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PHILLIPS, MONTANA
From 10-AUG-07 17:10:00 to 10-AUG-07 17:10:00 (MST-7)
Location: MALTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Cottonwood branches up to 4 inches in diameter snapped off.

Thunderstorm Wind in GARFIELD, MONTANA
From 10-AUG-07 17:20:00 to 10-AUG-07 17:20:00 (MST-7)
Location: SAND SPGS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind estimated at 60 to 70 mph.  Pea size hail also fell.

Thunderstorm Wind in VALLEY, MONTANA
From 10-AUG-07 17:30:00 to 10-AUG-07 17:30:00 (MST-7)
Location: GLASGOW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Thunderstorm Wind in GARFIELD, MONTANA
From 10-AUG-07 17:30:00 to 10-AUG-07 17:30:00 (MST-7)
Location: EDWARDS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PHILLIPS, MONTANA
From 10-AUG-07 17:35:00 to 10-AUG-07 17:35:00 (MST-7)
Location: SACO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in GARFIELD, MONTANA
From 10-AUG-07 18:00:00 to 10-AUG-07 18:00:00 (MST-7)
Location: JORDAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind estimated at 60 to 70 mph.

Thunderstorm Wind in VALLEY, MONTANA
From 10-AUG-07 18:14:00 to 10-AUG-07 18:14:00 (MST-7)
Location: NASHUA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind estimated at 60 to 70 mph.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-AUG-07 20:30:00 to 10-AUG-07 20:30:00 (MST-7)
Location: ANTELOPE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Estimated 60 mph wind along with pea size hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 10-AUG-07 16:20:00 to 10-AUG-07 16:20:00 (MST-7)
Location: ZORTMAN
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in DAWSON, MONTANA
From 10-AUG-07 19:40:00 to 10-AUG-07 19:40:00 (MST-7)
Location: LINDSAY
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:50:00 to 10-AUG-07 19:50:00 (MST-7)
Location: BROCKTON
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The wind was accompanied by pea sized hail.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-AUG-07 20:10:00 to 10-AUG-07 20:10:00 (MST-7)
Location: MEDICINE LAKE
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Medicine Lake Raws.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-AUG-07 20:30:00 to 10-AUG-07 20:30:00 (MST-7)
Location: COALRIDGE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The wind was accompanied by pea sized hail.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-AUG-07 20:40:00 to 10-AUG-07 20:40:00 (MST-7)
Location: ANTELOPE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in VALLEY, MONTANA
From 10-AUG-07 18:50:00 to 10-AUG-07 18:50:00 (MST-7)
Location: GLENTANA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCCONE, MONTANA
From 10-AUG-07 19:10:00 to 10-AUG-07 19:10:00 (MST-7)
Location: CIRCLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PRAIRIE, MONTANA
From 10-AUG-07 19:15:00 to 10-AUG-07 19:15:00 (MST-7)
Location: TERRY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:16:00 to 10-AUG-07 19:16:00 (MST-7)
Location: BROCKTON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The wind was accompanied by pea sized hail.

Thunderstorm Wind in DANIELS, MONTANA
From 10-AUG-07 19:16:00 to 10-AUG-07 19:16:00 (MST-7)
Location: WHITETAIL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WIBAUX, MONTANA
From 10-AUG-07 16:35:00 to 10-AUG-07 16:35:00 (MST-7)
Location: WIBAUX
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PRAIRIE, MONTANA
From 10-AUG-07 20:00:00 to 10-AUG-07 20:00:00 (MST-7)
Location: FALLON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WIBAUX, MONTANA
From 10-AUG-07 20:45:00 to 10-AUG-07 20:45:00 (MST-7)
Location: WIBAUX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCCONE, MONTANA
From 10-AUG-07 18:30:00 to 10-AUG-07 18:30:00 (MST-7)
Location: WELDON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MCCONE, MONTANA
From 10-AUG-07 18:30:00 to 10-AUG-07 18:30:00 (MST-7)
Location: WELDON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in VALLEY, MONTANA
From 10-AUG-07 18:40:00 to 10-AUG-07 18:40:00 (MST-7)
Location: OPHEIM
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAWSON, MONTANA
From 10-AUG-07 19:23:00 to 10-AUG-07 19:23:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:25:00 to 10-AUG-07 19:25:00 (MST-7)
Location: POPLAR
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:35:00 to 10-AUG-07 19:35:00 (MST-7)
Location: POPLAR
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rubber roofing on a house was ripped off.

Thunderstorm Wind in MCCONE, MONTANA
From 10-AUG-07 19:10:00 to 10-AUG-07 19:10:00 (MST-7)
Location: CIRCLE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

This report was taken from the Cow Creek DOT site.

Thunderstorm Wind in VALLEY, MONTANA
From 10-AUG-07 17:55:00 to 10-AUG-07 17:55:00 (MST-7)
Location: HINSDALE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 150 gallon tank that was quarter full was raised up on its side from the wind gust.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 18:57:00 to 10-AUG-07 18:57:00 (MST-7)
Location: (OLF)WOLF PT INT ARP
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

This report was taken from the Wolf Point ASOS.

Hail in VALLEY, MONTANA
From 10-AUG-07 18:40:00 to 10-AUG-07 18:40:00 (MST-7)
Location: OPHEIM
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in PHILLIPS, MONTANA
From 10-AUG-07 17:15:00 to 10-AUG-07 17:21:00 (MST-7)
Location: MALTA
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Several outbuildings on the property were leaning to the east, and shingles were found at least 100 yards away.  A refrigerator was flipped off the front porch of a house, and water was sucked up out of a four foot tall pool in the back yard.  A windmill was also twisted and a steer barn collapsed.  Based on the NWS damage survey the damage was estimated as EF1 where the steer barn collapsed, and the remainder of the damage was estimated at EF0.

Tornado in VALLEY, MONTANA
From 10-AUG-07 18:45:00 to 10-AUG-07 18:53:00 (MST-7)
Location: OPHEIM
Tornado F-scale: EF1
Property damage: 10.00K
Reported by: NWS Storm Survey

A fully loaded grain truck weighing 40,000 to 45,000 pounds was in the path of this tornado.  A bolted down upper portion of the truck's grain bin, which weighed 400 pounds, was lifted straight into the air causing minimal damage to the rest of the truck bin.  It then spun overhead and slammed into the ground twice at a distance of about 80 feet from the vehicle.  A witness reported a rotating wall cloud and a rain wrapped tornado.  A damage survey was conducted by the NWS and the tornado was rated in the low EF1 range.

Thunderstorm Wind in PHILLIPS, MONTANA
From 10-AUG-07 17:35:00 to 10-AUG-07 17:35:00 (MST-7)
Location: SACO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind throwing rocks against houses.

Thunderstorm Wind in GARFIELD, MONTANA
From 10-AUG-07 17:37:00 to 10-AUG-07 17:37:00 (MST-7)
Location: (JDN)JORDAN
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wind gust stayed above 58 mph through 548 pm MST.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:35:00 to 10-AUG-07 19:35:00 (MST-7)
Location: BROCKTON
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

The wind caused an air conditioner to be knocked out of a window.  A tree branch broke and caused a window to be broken.

Thunderstorm Wind in SHERIDAN, MONTANA
From 10-AUG-07 19:45:00 to 10-AUG-07 19:55:00 (MST-7)
Location: HOMESTEAD
Magnitude: 61.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind associated with a severe thunderstorm caused considerable roof damage to a home.  The roof damage was severe enough that rain entered the southern part of the house and caused additional damage to sheetrock, furniture and carpeting.

Thunderstorm Wind in MCCONE, MONTANA
From 10-AUG-07 18:20:00 to 10-AUG-07 18:20:00 (MST-7)
Location: WELDON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PETROLEUM, MONTANA
From 10-AUG-07 16:35:00 to 10-AUG-07 16:35:00 (MST-7)
Location: WINNETT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ROOSEVELT, MONTANA
From 10-AUG-07 19:20:00 to 10-AUG-07 19:20:00 (MST-7)
Location: POPLAR
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in RICHLAND, MONTANA
From 10-AUG-07 19:40:00 to 10-AUG-07 19:40:00 (MST-7)
Location: ENID
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter