As a trough pushed across the Pacific Northwest, an upper ridge flattened allowing southwest flow to develop and bring moisture to Central Montana. Showers and thunderstorms developed and moved across the plains of North-Central Montana during the afternoon and evening. Precipitation was enhanced by continued low level easterly up-slope flow. Over Southwest Montana, increased instability during the afternoon, coupled with the presence of a jet streak, resulted in scattered thunderstorm development with some storms becoming strong to severe.

Hail in JUDITH BASIN, MONTANA
From 03-AUG-13 17:48:00 to 03-AUG-13 17:48:00 (MST-7)
Location: STANFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail measuring 1.00 inches (quarter sized) was reported in Stanford, MT.

Thunderstorm Wind in FERGUS, MONTANA
From 03-AUG-13 21:10:00 to 03-AUG-13 21:10:00 (MST-7)
Location: DANVERS
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds measuring 52KT (60MPH) were reported 8 miles SE of Danvers, MT.

Heavy Rain in HILL, MONTANA
From 03-AUG-13 18:25:00 to 03-AUG-13 18:50:00 (MST-7)
Location: GILDFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Heavy rain measuring .50 inches in 25 minutes reported at Wild Horse Port of Entry. Water was reported to be ponding and running across the roadway.

Thunderstorm Wind in GALLATIN, MONTANA
From 01-AUG-13 17:04:00 to 01-AUG-13 17:04:00 (MST-7)
Location: AMSTERDAM
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong winds measuring 68KT (78MPH) were reported 3 miles NW of Amsterdam, MT.

Thunderstorm Wind in BEAVERHEAD, MONTANA
From 01-AUG-13 15:00:00 to 01-AUG-13 15:00:00 (MST-7)
Location: POLARIS
Magnitude: 90.00 MG
Crop damage: 0.00K
Reported by: Public

Strong winds measuring 90KT (104MPH) were reported 3 miles N of Polaris, MT. Winds caused damage to a home and trees in the area of the report.

Thunderstorm Wind in GALLATIN, MONTANA
From 01-AUG-13 17:07:00 to 01-AUG-13 17:07:00 (MST-7)
Location: MANHATTAN
Magnitude: 77.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong winds measuring 77KT (89MPH) were reported 5 miles E of Manhattan, MT.

Thunderstorm Wind in MADISON, MONTANA
From 01-AUG-13 15:55:00 to 01-AUG-13 15:55:00 (MST-7)
Location: TWIN BRIDGES
Magnitude: 78.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong winds measuring 78KT (90MPH) were reported 2 miles ESE of Twin Bridges, MT. Five large trees were reported down as a result of the wind.

Thunderstorm Wind in GALLATIN, MONTANA
From 01-AUG-13 17:10:00 to 01-AUG-13 17:10:00 (MST-7)
Location: (BZN)GALLATIN FLD BO
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Strong winds measuring 50KT (58MPH) were reported 1 miles NE of Belgrade, MT at the Bozeman-Gallatin Field Airport ASOS.

Heavy Rain in LIBERTY, MONTANA
From 01-AUG-13 18:00:00 to 02-AUG-13 18:00:00 (MST-7)
Location: WHITLASH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy rain of 2.53 inches in 24 hours was reported 7 miles E of Whitlash, MT.

Heavy Rain in FERGUS, MONTANA
From 01-AUG-13 18:00:00 to 02-AUG-13 18:00:00 (MST-7)
Location: GARNEILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Heavy rain measuring 2.30 inches in 24 hours was reported at the Crystal Lake SNOTEL 12 miles ENE of Garneill, MT.

Hail in FERGUS, MONTANA
From 03-AUG-13 22:14:00 to 03-AUG-13 22:14:00 (MST-7)
Location: GRASSRANGE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.25 inches (half dollar sized) was reported in Grass Range, MT.

Thunderstorm Wind in BEAVERHEAD, MONTANA
From 01-AUG-13 15:01:00 to 01-AUG-13 15:01:00 (MST-7)
Location: JACKSON
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Strong winds measuring 58KT (67MPH) were reported 6 miles SE of Jackson, MT at Big Hole Pass.

Thunderstorm Wind in GALLATIN, MONTANA
From 01-AUG-13 17:10:00 to 01-AUG-13 17:10:00 (MST-7)
Location: BOZEMAN
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds measuring 53KT (61MPH) and nickel sized hail were reported 1 mile WSW of Bozeman, MT .

Thunderstorm Wind in GALLATIN, MONTANA
From 01-AUG-13 17:14:00 to 01-AUG-13 17:14:00 (MST-7)
Location: MANHATTAN
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds measuring 52KT (60MPH) were reported 8 miles S of Manhattan, MT. Numerous large tree limbs around 2 feet in diameter reported down.

Hail in BEAVERHEAD, MONTANA
From 01-AUG-13 14:48:00 to 01-AUG-13 14:48:00 (MST-7)
Location: JACKSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.00 inches (quarter sized) was reported in Jackson, MT.

Hail in MADISON, MONTANA
From 01-AUG-13 16:00:00 to 01-AUG-13 16:00:00 (MST-7)
Location: TWIN BRIDGES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.00 inches (quarter sized) was reported in Twin Bridges, MT. Trees reported down as well.

Hail in MADISON, MONTANA
From 01-AUG-13 15:58:00 to 01-AUG-13 15:58:00 (MST-7)
Location: TWIN BRIDGES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.50 inches (ping pong ball sized) was reported in Twin Bridges, MT.

Hail in GALLATIN, MONTANA
From 01-AUG-13 17:14:00 to 01-AUG-13 17:14:00 (MST-7)
Location: MANHATTAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.50 inches (ping pong ball sized) was reported 8 mi S of Manhattan, MT.

Hail in GALLATIN, MONTANA
From 01-AUG-13 17:15:00 to 01-AUG-13 17:15:00 (MST-7)
Location: BELGRADE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.75 inches (golf ball sized) was reported 4 miles ESE of Belgrade, MT.

Hail in GALLATIN, MONTANA
From 01-AUG-13 17:37:00 to 01-AUG-13 17:37:00 (MST-7)
Location: BOZEMAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail measuring 1.50 inches (ping pong ball sized) was reported near the MSU campus in Bozeman, MT.

Heavy Rain in TOOLE, MONTANA
From 01-AUG-13 19:00:00 to 02-AUG-13 19:00:00 (MST-7)
Location: FERDIG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain measuring 1.80 inches in 24 hours was reported 9 miles E of Ferdig, MT.

Thunderstorm Wind in BROADWATER, MONTANA
From 02-AUG-13 02:05:00 to 02-AUG-13 02:05:00 (MST-7)
Location: WINSTON
Magnitude: 74.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong winds measuring 74KT (85MPH) were reported 6 miles SE of Winston, MT. Trees reportedly stripped of all leaves due to wind.

Heavy Rain in FERGUS, MONTANA
From 01-AUG-13 18:00:00 to 02-AUG-13 18:00:00 (MST-7)
Location: FORESTGROVE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Heavy rain measuring 1.63 inches in 24 hours was reported at the Little Snowy RAWS 17 miles S of Forestgrove, MT.

Hail in CASCADE, MONTANA
From 03-AUG-13 19:34:00 to 03-AUG-13 19:34:00 (MST-7)
Location: MONARCH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail measuring 1.00 inches (quarter sized) was reported 1 mile SSE of Monarch, MT.

Thunderstorm Wind in JUDITH BASIN, MONTANA
From 03-AUG-13 19:45:00 to 03-AUG-13 19:45:00 (MST-7)
Location: STANFORD
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Strong winds measuring 56KT (64MPH) were reported 3 miles S of Stanford, MT.