A strong low-pressure system combined with a moderately-unstable atmosphere to form a series of squall lines and severe thunderstorms which moved over far eastern Montana.

Hail in DANIELS, MONTANA
From 03-SEP-14 16:48:00 to 03-SEP-14 16:48:00 (MST-7)
Location: SCOBEY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported half dollar-sized hail.

Hail in DANIELS, MONTANA
From 03-SEP-14 17:04:00 to 03-SEP-14 17:04:00 (MST-7)
Location: SCOBEY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter- to half dollar-sized hail covering the ground.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 03-SEP-14 16:55:00 to 03-SEP-14 16:55:00 (MST-7)
Location: MCDONALDS DOT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The McDonalds DOT site measured a 67 mph wind gust.

Hail in DANIELS, MONTANA
From 03-SEP-14 17:06:00 to 03-SEP-14 17:06:00 (MST-7)
Location: SCOBEY
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 03-SEP-14 17:30:00 to 03-SEP-14 17:30:00 (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.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 03-SEP-14 17:30:00 to 03-SEP-14 17:30:00 (MST-7)
Location: BREDETTE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 60 mph wind gusts.

Hail in ROOSEVELT, MONTANA
From 03-SEP-14 17:05:00 to 03-SEP-14 17:05:00 (MST-7)
Location: BREDETTE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel-sized hail.

Hail in RICHLAND, MONTANA
From 03-SEP-14 19:00:00 to 03-SEP-14 19:00:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported nickel-sized hail.

Hail in SHERIDAN, MONTANA
From 03-SEP-14 17:45:00 to 03-SEP-14 17:45:00 (MST-7)
Location: MEDICINE LAKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Hail in SHERIDAN, MONTANA
From 03-SEP-14 17:40:00 to 03-SEP-14 17:40:00 (MST-7)
Location: RESERVE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported nickel-sized hail.

Thunderstorm Wind in SHERIDAN, MONTANA
From 03-SEP-14 17:45:00 to 03-SEP-14 17:45:00 (MST-7)
Location: MEDICINE LAKE
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

A semi-truck was blown over due to the strong microbust winds within the squall line of thunderstorms that moved through.  Other minor damage was reported in the area as well to homes and farm outbuildings.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 03-SEP-14 17:45:00 to 03-SEP-14 18:05:00 (MST-7)
Location: FROID
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Damage was found at a new home site with a modular home and a large metal pole barn located 2.4 miles east of the intersection of Highway 16 and County Road 496.  There were two other home sites west of this home, with no obvious damage.  The newer home had a few missing shingles, but the new pole barn had the south door blown in with the south wall blown out to the southeast. There were a few trees that were snapped or cracked and dropped about 2-3 feet off the ground, including older Russian olive trees.  The damage to the pole barn was estimated to have been caused by 70-75 mph winds.  The homeowners were home and said the wind came from the west-northwest and there was a lot of dirt and gravel kicked up and thrown at them prior to their seeking shelter in a safe room in the pole barn.  The garage door was blown in and the south wall was blown out.  The garage door blew through the side wall and landed on a trailer near a tree row.   All the insulation and debris from the side wall collapse were blown eastward.
Another third of a mile east is the town site of McCabe, where there are a few homes, sheds and outbuildings.  This area had a large older Russian olive tree uprooted as well as a two healthy spruce trees uprooted that were at least 25 feet tall.  There was a shed damaged as well, but the two garage doors on it were open directly to the microburst winds, and the wood at the concrete footing was over 30 years old.  All the debris was blown eastward.
There was a lot of minor damage as well through the townsite.