A broad upper level disturbance helped initiate thunderstorms over portions of southwest and central Montana. Hail the size of baseballs was reported as well as wind gusts in excess of 60 mph.

Hail in BEAVERHEAD, MONTANA
From 06-AUG-09 15:15:00 to 06-AUG-09 15:15:00 (MST-7)
Location: WISE RIVER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped 2.75 inch diameter hail at Wise River 3S.

Hail in MEAGHER, MONTANA
From 06-AUG-09 15:42:00 to 06-AUG-09 15:42:00 (MST-7)
Location: WHITE SULPHUR SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm dropped 1.75 inch diameter hail at White Sulphur Springs 20 WNW.

Hail in BROADWATER, MONTANA
From 06-AUG-09 17:08:00 to 06-AUG-09 17:08:00 (MST-7)
Location: TOSTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm dropped 1.75 inch diameter hail at Toston.

Hail in FERGUS, MONTANA
From 06-AUG-09 17:15:00 to 06-AUG-09 17:15:00 (MST-7)
Location: DENTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A thunderstorm dropped 1.25 inch diameter hail at Denton 17SE (Ware, Montana).

Thunderstorm Wind in FERGUS, MONTANA
From 06-AUG-09 17:25:00 to 06-AUG-09 17:25:00 (MST-7)
Location: LEWISTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced a wind gust to 60 mph at Lewistown 12NW.

Thunderstorm Wind in FERGUS, MONTANA
From 06-AUG-09 17:50:00 to 06-AUG-09 17:50:00 (MST-7)
Location: LEWISTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A thunderstorm produced a wind gust to 60 mph at Lewistown 12NNW.

Thunderstorm Wind in JEFFERSON, MONTANA
From 07-AUG-09 02:15:00 to 07-AUG-09 02:15:00 (MST-7)
Location: BASIN
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A thunderstorm produced a wind gust to 63 mph at Basin 11SW (the Elk Park DOT site).

Thunderstorm Wind in MEAGHER, MONTANA
From 06-AUG-09 17:08:00 to 06-AUG-09 17:08:00 (MST-7)
Location: WHITE SULPHUR SPGS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A thunderstorm downed several large trees across Montana Highway 89 south of Kings Hill. An estimated 80 trees were either uprooted or snapped off by estimated 60 mph downburst winds.

Hail in BEAVERHEAD, MONTANA
From 06-AUG-09 12:40:00 to 06-AUG-09 12:40:00 (MST-7)
Location: WISDOM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped 1 inch diameter hail at Wisdom.

Hail in BEAVERHEAD, MONTANA
From 06-AUG-09 13:15:00 to 06-AUG-09 13:15:00 (MST-7)
Location: WISE RIVER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped 1.75 inch diameter hail at Wise River.

Thunderstorm Wind in BROADWATER, MONTANA
From 06-AUG-09 14:39:00 to 06-AUG-09 14:39:00 (MST-7)
Location: WINSTON
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A thunderstorm produced a wind gust to 68 mph at Winston 1W.

Hail in MEAGHER, MONTANA
From 06-AUG-09 14:42:00 to 06-AUG-09 14:42:00 (MST-7)
Location: WHITE SULPHUR SPGS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped 1.75 inch diameter hail at White Sulphur Springs 20WNW.

Hail in JEFFERSON, MONTANA
From 06-AUG-09 14:42:00 to 06-AUG-09 14:42:00 (MST-7)
Location: CARDWELL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm dropped 1 inch diameter hail at Cardwell 14N.