Among some benign surface features, a modearately moist and warm atmosphere was able to set off a number of severe thunderstorms.

Hail in ROOSEVELT, MONTANA
From 20-JUL-13 17:15:00 to 20-JUL-13 17:15:00 (MST-7)
Location: WOLF PT INTL AIRPORT(KOLF)
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of golf balls.

Hail in MCCONE, MONTANA
From 20-JUL-13 17:37:00 to 20-JUL-13 17:37:00 (MST-7)
Location: VIDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of quarters, winds up to 30 mph, and moderate rain reducing visibility to one-half mile.

Hail in MCCONE, MONTANA
From 20-JUL-13 17:54:00 to 20-JUL-13 17:54:00 (MST-7)
Location: COW CREEK DOT
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of baseballs and heavy rain.

Thunderstorm Wind in MCCONE, MONTANA
From 20-JUL-13 17:46:00 to 20-JUL-13 17:46:00 (MST-7)
Location: COW CREEK DOT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A wind gust of 67 mph was recorded at the Cow Creek DOT site.

Thunderstorm Wind in MCCONE, MONTANA
From 20-JUL-13 17:50:00 to 20-JUL-13 17:50:00 (MST-7)
Location: CIRCLE
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a 78 mph wind gust.

Hail in DAWSON, MONTANA
From 20-JUL-13 18:45:00 to 20-JUL-13 18:45:00 (MST-7)
Location: LINDSAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Cooperative observer reported hail up to the size of golf balls and heavy rain.

Hail in DAWSON, MONTANA
From 20-JUL-13 19:15:00 to 20-JUL-13 19:15:00 (MST-7)
Location: HOYT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of golf balls.

Hail in PRAIRIE, MONTANA
From 20-JUL-13 19:30:00 to 20-JUL-13 19:30:00 (MST-7)
Location: FALLON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter-sized hail.

Hail in PRAIRIE, MONTANA
From 20-JUL-13 19:44:00 to 20-JUL-13 19:44:00 (MST-7)
Location: FALLON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of half dollars.

Hail in VALLEY, MONTANA
From 20-JUL-13 16:45:00 to 20-JUL-13 16:45:00 (MST-7)
Location: OSWEGO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter-sized hail.

Hail in PRAIRIE, MONTANA
From 20-JUL-13 19:45:00 to 20-JUL-13 19:45:00 (MST-7)
Location: FALLON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of golf balls.

Hail in PRAIRIE, MONTANA
From 20-JUL-13 19:55:00 to 20-JUL-13 19:55:00 (MST-7)
Location: MILDRED
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Cooperative observer reported hail up to the size of golf balls.

Hail in VALLEY, MONTANA
From 20-JUL-13 16:35:00 to 20-JUL-13 16:35:00 (MST-7)
Location: OSWEGO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of nickels.  Location on the edge of the storm.

Thunderstorm Wind in MCCONE, MONTANA
From 20-JUL-13 17:50:00 to 20-JUL-13 17:50:00 (MST-7)
Location: CIRCLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported that some metal fencing was damaged.