Severe thunderstorms producing large hail and damaging winds moved across portions of South Central and Southeast Montana during the late afternoon hours of the 22nd and continued into the early morning hours of the 23rd.

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 22-JUL-08 19:50:00 to 22-JUL-08 19:50:00 (MST-7)
Location: (BIL)LOGAN ARPT BILL
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

Microburst winds were estimated at 60 to 70 mph on the south side of Billings. A mobile home roof was blown off and numerous six to eight inch tree limbs were blown down, along with a couple of eight to twelve inch limbs down with some minor damage.

Hail in POWDER RIVER, MONTANA
From 22-JUL-08 16:10:00 to 22-JUL-08 16:10:00 (MST-7)
Location: BIDDLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 22-JUL-08 17:15:00 to 22-JUL-08 17:15:00 (MST-7)
Location: BIDDLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PARK, MONTANA
From 22-JUL-08 17:45:00 to 22-JUL-08 17:45:00 (MST-7)
Location: WILSALL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts were estimated at 70 mph 1 mile north of Wilsall.

Thunderstorm Wind in PARK, MONTANA
From 22-JUL-08 17:45:00 to 22-JUL-08 17:45:00 (MST-7)
Location: WILSALL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts were estimated at 70 mph 8 miles east/northeast of Wilsall. This resulted in a wooden shed and a tree to be blown into a county road.

Thunderstorm Wind in PARK, MONTANA
From 22-JUL-08 17:50:00 to 22-JUL-08 17:50:00 (MST-7)
Location: CLYDE PARK
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm wind gust of 64 mph was measured 5 miles south of Clyde Park.

Hail in YELLOWSTONE, MONTANA
From 22-JUL-08 19:50:00 to 22-JUL-08 19:50:00 (MST-7)
Location: (BIL)LOGAN ARPT BILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BIG HORN, MONTANA
From 22-JUL-08 20:32:00 to 22-JUL-08 20:32:00 (MST-7)
Location: HARDIN
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Several power line poles were down along Highway 47 from mile markers 4 through 9. This was a result of an estimated thunderstorm wind gust of 80 mph 5 miles north of Hardin.

Thunderstorm Wind in BIG HORN, MONTANA
From 22-JUL-08 20:46:00 to 22-JUL-08 20:46:00 (MST-7)
Location: HARDIN
Magnitude: 65.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were down with fire starts in the area as a result of an estimated thunderstorm wind gust of 75 mph in Hardin.

Thunderstorm Wind in ROSEBUD, MONTANA
From 22-JUL-08 22:00:00 to 22-JUL-08 22:00:00 (MST-7)
Location: FORSYTH
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated thunderstorm wind gust of 60 mph was reported in Forsyth.

Thunderstorm Wind in CUSTER, MONTANA
From 22-JUL-08 23:05:00 to 22-JUL-08 23:05:00 (MST-7)
Location: (MLS)WILEY FLD MILES
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An estimated thunderstorm wind gust of 60 mph was reported 1 mile northwest of Miles City.

Thunderstorm Wind in PARK, MONTANA
From 22-JUL-08 17:55:00 to 22-JUL-08 17:55:00 (MST-7)
Location: CLYDE PARK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm wind gusts estimated at 70 mph were reported in Clyde Park. Some small tree limbs were reported down along with some scattered power outages.

Flash Flood in POWDER RIVER, MONTANA
From 22-JUL-08 20:00:00 to 22-JUL-08 23:00:00 (MST-7)
Location: BIDDLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flooding was reported at Wild Bill and Blacktail Creeks along Powder River. In addition, two roads were washed out south of Biddle near the Montana/Wyoming border.