A tornado watch was issued during the afternoon and evening hours of the 11th and 12th across portions of southeast Montana as conditions were favorable for rotating thunderstorms. Large hail and a tornado were reported during this time period.

Hail in CARTER, MONTANA
From 12-JUN-11 15:30:00 to 12-JUN-11 15:30:00 (MST-7)
Location: HAMMOND
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARTER, MONTANA
From 12-JUN-11 16:10:00 to 12-JUN-11 16:10:00 (MST-7)
Location: HAMMOND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported golf ball size hail on Highway 212 west of Alzada.

Hail in CUSTER, MONTANA
From 12-JUN-11 16:15:00 to 12-JUN-11 16:15:00 (MST-7)
Location: MIZPAH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in CARTER, MONTANA
From 12-JUN-11 16:35:00 to 12-JUN-11 16:50:00 (MST-7)
Location: ALBION
Tornado F-scale: EF1
Reported by: Storm Chaser

At 535 pm, a tornado touched down 5 miles west of Albion, MT in far southeast Montana. The tornado was estimated to have remained on the ground for 15 minutes, traveling approximately 5 miles to the east northeast. The tornado produced periodic damage along a 100 yard wide path. The worst of the damage was located one mile north of Albion. A National Weather Service Cooperative Weather Observer located just north of Albion reported 50-60 trees that were snapped off, some as large as 2 feet in diameter. Two calves were also killed in this vicinity. Before the tornado lifted, 1.5 miles northeast of Albion, the tornado destroyed several grain bins, snapped off 4 power poles, flipped a semi-trailer on its side and produced minor damage to a nearby home. The tornado was classified as an EF-1, with estimated winds of 86-109 mph at its strongest point, one mile north of Albion.

Thunderstorm Wind in CARTER, MONTANA
From 12-JUN-11 16:45:00 to 12-JUN-11 16:45:00 (MST-7)
Location: ALBION
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

An estimated wind gust of 65 mph was reported 2 miles southwest of Albion.

Hail in POWDER RIVER, MONTANA
From 12-JUN-11 14:53:00 to 12-JUN-11 14:53:00 (MST-7)
Location: BOWERS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pea to ping pong ball sized hailed fell for 10 minutes.

Hail in POWDER RIVER, MONTANA
From 12-JUN-11 15:06:00 to 12-JUN-11 15:06:00 (MST-7)
Location: BOWERS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter to golf ball size hail fell.

Hail in CARTER, MONTANA
From 11-JUN-11 17:56:00 to 11-JUN-11 17:56:00 (MST-7)
Location: RIDGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARTER, MONTANA
From 11-JUN-11 17:52:00 to 11-JUN-11 17:52:00 (MST-7)
Location: RIDGE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ping pong ball size hail was reported near Ridge.

Funnel Cloud in POWDER RIVER, MONTANA
From 11-JUN-11 17:20:00 to 11-JUN-11 17:20:00 (MST-7)
Location: EPSIE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Storm spotter reported a brief funnel cloud about 9 miles west of Broadus.

Hail in POWDER RIVER, MONTANA
From 12-JUN-11 14:43:00 to 12-JUN-11 14:43:00 (MST-7)
Location: BIDDLE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 12-JUN-11 14:40:00 to 12-JUN-11 14:40:00 (MST-7)
Location: BIDDLE
Magnitude: 4.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter