A strong upper-level disturbance from the pacific northwest combined with an unstable low-level atmosphere to create many severe thunderstorms which progressed eastward across the area.

Flash Flood in DAWSON, MONTANA
From 08-JUL-13 17:00:00 to 08-JUL-13 17:00:00 (MST-7)
Location: GLENDIVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rain and street flooding.

Hail in GARFIELD, MONTANA
From 08-JUL-13 14:30:00 to 08-JUL-13 14:30:00 (MST-7)
Location: VAN NORMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail and estimated wind gusts up to 50 mph.

Hail in GARFIELD, MONTANA
From 08-JUL-13 14:57:00 to 08-JUL-13 14:57:00 (MST-7)
Location: VAN NORMAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported walnut-sized hail.

Hail in GARFIELD, MONTANA
From 08-JUL-13 15:00:00 to 08-JUL-13 15:00:00 (MST-7)
Location: VAN NORMAN
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tea cup sized hail.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:15:00 to 08-JUL-13 16:15:00 (MST-7)
Location: HOYT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts up to 70 mph along with heavy rain and a small amount of pea-sized hail.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:25:00 to 08-JUL-13 16:25:00 (MST-7)
Location: HOYT
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 with branches falling out of their trees.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:30:00 to 08-JUL-13 16:30:00 (MST-7)
Location: GLENDIVE
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Glendive AWOS measured a wind gust of 61 mph.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:33:00 to 08-JUL-13 16:33:00 (MST-7)
Location: GLENDIVE DAWSON ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported wind gusts up to 60 mph.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 16:35:00 to 08-JUL-13 16:35:00 (MST-7)
Location: FALLON
Magnitude: 83.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS storm survey estimated wind gusts up to 95 mph from straight-line winds which damaged up-rooted large trees, removed roofing materials, and destroyed some small outbuildings.

Hail in DAWSON, MONTANA
From 08-JUL-13 16:37:00 to 08-JUL-13 16:37:00 (MST-7)
Location: HOYT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail and heavy rain.

Hail in DAWSON, MONTANA
From 08-JUL-13 16:45:00 to 08-JUL-13 16:45:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter-sized hail with heavy rain flooding the streets and running over the curbs.

Hail in DAWSON, MONTANA
From 08-JUL-13 16:45:00 to 08-JUL-13 16:45:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail causing damage to their garden.

Hail in DAWSON, MONTANA
From 08-JUL-13 16:50:00 to 08-JUL-13 16:50:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of quarters.

Hail in PRAIRIE, MONTANA
From 08-JUL-13 17:00:00 to 08-JUL-13 17:00:00 (MST-7)
Location: BLATCHFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail and wind gusts up to 45 mph.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:45:00 to 08-JUL-13 16:45:00 (MST-7)
Location: GLENDIVE
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.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 16:45:00 to 08-JUL-13 16:45:00 (MST-7)
Location: MILDRED
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured wind gusts up to 69 mph.

Hail in WIBAUX, MONTANA
From 08-JUL-13 17:40:00 to 08-JUL-13 17:40:00 (MST-7)
Location: BEAVER HILL DOT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported half dollar sized hail destroyed their garden.

Thunderstorm Wind in RICHLAND, MONTANA
From 08-JUL-13 16:37:00 to 08-JUL-13 16:37:00 (MST-7)
Location: CRANE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts of at least 60 mph.  Large cottonwood trees bending with the wind.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:15:00 to 08-JUL-13 15:15:00 (MST-7)
Location: BROCKWAY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported walnut-sized hail.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:15:00 to 08-JUL-13 15:15:00 (MST-7)
Location: BROCKWAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:20:00 to 08-JUL-13 15:20:00 (MST-7)
Location: BROCKWAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:20:00 to 08-JUL-13 15:30:00 (MST-7)
Location: BROCKWAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up the size of quarters lasting 10 minutes.

Hail in DAWSON, MONTANA
From 08-JUL-13 15:45:00 to 08-JUL-13 15:45:00 (MST-7)
Location: RICHEY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in PRAIRIE, MONTANA
From 08-JUL-13 15:55:00 to 08-JUL-13 15:55:00 (MST-7)
Location: MC CLOUD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Hail in DAWSON, MONTANA
From 08-JUL-13 16:07:00 to 08-JUL-13 16:07:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail covering the ground with leaves shredded from trees.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:09:00 to 08-JUL-13 16:09:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a wind gust of 72.5 mph.

Thunderstorm Wind in WIBAUX, MONTANA
From 08-JUL-13 17:10:00 to 08-JUL-13 17:10:00 (MST-7)
Location: WIBAUX
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated wind gusts up to 70 mph.

Thunderstorm Wind in WIBAUX, MONTANA
From 08-JUL-13 17:30:00 to 08-JUL-13 17:30:00 (MST-7)
Location: WIBAUX
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.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 18:40:00 to 08-JUL-13 18:40:00 (MST-7)
Location: MILDRED
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated 70 mph winds with heavy rain reducing visibility to less than one-quarter mile.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 16:40:00 to 08-JUL-13 16:40:00 (MST-7)
Location: FALLON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Prairie County Dispatch office reported an over-turned semi truck on I-94 near mile marker 191 at the Fallon exit.

Thunderstorm Wind in WIBAUX, MONTANA
From 08-JUL-13 17:40:00 to 08-JUL-13 17:40:00 (MST-7)
Location: BEAVER HILL DOT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts up to 70 mph with several 3-inch diameter tree branches downed.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 16:20:00 to 08-JUL-13 16:25:00 (MST-7)
Location: TERRY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Trained spotter and Law Enforcement reported that the old drive-in theater screen in Terry was mostly destroyed, tin structures sustained roof damage, and road signs were ripped off their poles.

Thunderstorm Wind in PRAIRIE, MONTANA
From 08-JUL-13 15:55:00 to 08-JUL-13 15:55:00 (MST-7)
Location: MC CLOUD
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a 70 mph wind gust.

Thunderstorm Wind in DAWSON, MONTANA
From 08-JUL-13 16:35:00 to 08-JUL-13 16:35:00 (MST-7)
Location: GLENDIVE DAWSON ARPT
Magnitude: 83.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

NWS storm survey estimated 95 mph wind gusts. Walls blown out of a free-standing metal building near mile marker 208 on I-94 with some sheet metal blown one-half mile down wind. A manufactured home rolled over near the same area.

Hail in GARFIELD, MONTANA
From 08-JUL-13 13:35:00 to 08-JUL-13 13:35:00 (MST-7)
Location: JORDAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter located 7 miles southeast of the Hell Creek Recreation Area reported golf ball sized hail covering Haxby Road.

Hail in GARFIELD, MONTANA
From 08-JUL-13 15:00:00 to 08-JUL-13 15:10:00 (MST-7)
Location: VAN NORMAN
Magnitude: 2.50 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of hen eggs fell for 10 minutes, breaking a skylight and several windows.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:00:00 to 08-JUL-13 15:00:00 (MST-7)
Location: BROCKWAY
Magnitude: 1.75 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of golf balls broke windows, damaged siding, damaged a camper, and destroyed a pea crop.

Hail in MCCONE, MONTANA
From 08-JUL-13 15:15:00 to 08-JUL-13 15:30:00 (MST-7)
Location: BROCKWAY
Magnitude: 2.75 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported that hail up to the size of baseballs fell for over 10 minutes, breaking windows and stripping most of the leaves from a tree.

Hail in PRAIRIE, MONTANA
From 08-JUL-13 16:30:00 to 08-JUL-13 16:30:00 (MST-7)
Location: FALLON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Hail in PRAIRIE, MONTANA
From 08-JUL-13 16:07:00 to 08-JUL-13 16:07:00 (MST-7)
Location: MC CLOUD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a few quarter-sized hail stones among the heavy rainfall.