Severe weather continued into the third week of June across the Billings Forecast Area.
Plenty of low-level moisture continued to be in place across Southeast Montana. Strong winds aloft along, an upper level disturbance and low-level moisture all combined to help produce numerous thunderstorms across Southeast Montana. A tornado watch was issued for the afternoon and evening hours. Numerous severe thunderstorms developed by mid afternoon and continued well into the evening hours. A couple thunderstorms produced tornadoes, one of which was the Cache Creek Tornado.

Hail in ROSEBUD, MONTANA
From 21-JUN-10 17:30:00 to 21-JUN-10 17:30:00 (MST-7)
Location: BIRNEY
Magnitude: 2.75 
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 17:32:00 to 21-JUN-10 17:32:00 (MST-7)
Location: EPSIE
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 21-JUN-10 17:00:00 to 21-JUN-10 17:00:00 (MST-7)
Location: ASHLAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 21-JUN-10 17:27:00 to 21-JUN-10 17:27:00 (MST-7)
Location: BIRNEY
Magnitude: 1.75 
Reported by: Trained Spotter

Funnel Cloud in ROSEBUD, MONTANA
From 21-JUN-10 17:30:00 to 21-JUN-10 17:30:00 (MST-7)
Location: BIRNEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 19:10:00 to 21-JUN-10 19:10:00 (MST-7)
Location: BROADUS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Some tree branches were broken.

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 19:15:00 to 21-JUN-10 19:15:00 (MST-7)
Location: BROADUS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 19:15:00 to 21-JUN-10 19:15:00 (MST-7)
Location: BIDDLE
Magnitude: 1.75 
Reported by: COOP Observer

Thunderstorm Wind in CARTER, MONTANA
From 21-JUN-10 19:15:00 to 21-JUN-10 19:15:00 (MST-7)
Location: HAMMOND
Magnitude: 78.00 EG
Reported by: Public

An estimated wind gust of 90 mph was reported in Hammond.

Funnel Cloud in POWDER RIVER, MONTANA
From 21-JUN-10 17:00:00 to 21-JUN-10 17:00:00 (MST-7)
Location: OTTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was visible just to the south.

Tornado in POWDER RIVER, MONTANA
From 21-JUN-10 18:00:00 to 21-JUN-10 18:10:00 (MST-7)
Location: OTTER
Tornado F-scale: EF1
Property damage: 107.00K
Crop damage: 0.00K
Reported by: Public

The Otter Tornado was on the ground for approximately one mile with a 200 yard wide path of damage. Numerous trees were snapped off and uprooted. The Otter Post Office and an adjacent home received partial roof damage.

Thunderstorm Wind in POWDER RIVER, MONTANA
From 21-JUN-10 19:10:00 to 21-JUN-10 19:15:00 (MST-7)
Location: (4BQ)BROADUS ARPT
Magnitude: 78.00 EG
Property damage: 55.50K
Reported by: Public

The Boyes microburst winds were estimated to be 80 to 100 mph. Five grain bins were blown several hundred yards and three power poles were blown down. In addition, portions of rooftops were peeled back on two metal structures. There was some other minor damage as well.

Hail in ROSEBUD, MONTANA
From 21-JUN-10 17:20:00 to 21-JUN-10 17:20:00 (MST-7)
Location: BIRNEY
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in CARTER, MONTANA
From 21-JUN-10 20:15:00 to 21-JUN-10 20:15:00 (MST-7)
Location: ALZADA
Magnitude: 1.75 
Reported by: Trained Spotter

Wind gusts up to 50 mph with hail from pea to golf ball size were reported.

Thunderstorm Wind in CARTER, MONTANA
From 21-JUN-10 19:55:00 to 21-JUN-10 19:55:00 (MST-7)
Location: EKALAKA
Magnitude: 58.00 MG
Reported by: AWOS

Flash Flood in POWDER RIVER, MONTANA
From 21-JUN-10 19:00:00 to 22-JUN-10 01:30:00 (MST-7)
Location: BROADUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported three roads closed in the Broadus area due to high running water. The water depth was estimated at over two feet. The Sheriff also reported area rivers and streams were running very high.

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 17:00:00 to 21-JUN-10 17:00:00 (MST-7)
Location: OTTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was visible just to the south.

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 18:00:00 to 21-JUN-10 18:00:00 (MST-7)
Location: OTTER
Magnitude: 1.75 
Reported by: Public

Hail in ROSEBUD, MONTANA
From 21-JUN-10 18:30:00 to 21-JUN-10 18:30:00 (MST-7)
Location: ROSEBUD
Magnitude: 1.25 
Reported by: COOP Observer

Thunderstorm Wind in ROSEBUD, MONTANA
From 21-JUN-10 18:35:00 to 21-JUN-10 18:35:00 (MST-7)
Location: THURLOW
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 18:37:00 to 21-JUN-10 18:37:00 (MST-7)
Location: BROADUS
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 21-JUN-10 18:45:00 to 21-JUN-10 18:45:00 (MST-7)
Location: (4BQ)BROADUS ARPT
Magnitude: 1.75 
Reported by: Law Enforcement

Hail in ROSEBUD, MONTANA
From 21-JUN-10 18:54:00 to 21-JUN-10 18:54:00 (MST-7)
Location: ROSEBUD
Magnitude: 1.75 
Reported by: Trained Spotter

Funnel Cloud in CUSTER, MONTANA
From 21-JUN-10 19:04:00 to 21-JUN-10 19:04:00 (MST-7)
Location: (MLS)WILEY FLD MILES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The funnel cloud was spotted on the north side of the Yellowstone River.

Tornado in POWDER RIVER, MONTANA
From 21-JUN-10 18:10:00 to 21-JUN-10 18:20:00 (MST-7)
Location: (4BQ)BROADUS ARPT
Tornado F-scale: EF2
Property damage: 150.00K
Reported by: Public

The Cache Creek Tornado was 100 yards wide and on the ground for approximately a half mile. The tornado lasted just over ten minutes. Damage consisted of a house roof and front porch blown off, broken windows, as well as the house being shifted off of its foundation. Winds were estimated at 111-135 mph.