An approaching upper trough and jet max brought a strong line of thunderstorms across the Billings Forecast Area. Sufficient deep layer shear and instability resulted in supercells with large hail and damaging winds.

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 15:55:00 to 14-JUL-11 15:55:00 (MST-7)
Location: LOCKWOOD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 16:11:00 to 14-JUL-11 16:11:00 (MST-7)
Location: LOCKWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 16:11:00 to 14-JUL-11 16:11:00 (MST-7)
Location: (BIL)LOGAN ARPT BILL
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 14-JUL-11 16:15:00 to 14-JUL-11 16:15:00 (MST-7)
Location: SHEPHERD
Magnitude: 78.00 EG
Reported by: NWS Storm Survey

A wet microburst caused crop and tree damage over a 3 square mile area. In addition, several dozen trees were uprooted.

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 16:17:00 to 14-JUL-11 16:17:00 (MST-7)
Location: POMPEYS PILLAR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BIG HORN, MONTANA
From 14-JUL-11 17:05:00 to 14-JUL-11 17:05:00 (MST-7)
Location: HARDIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 14-JUL-11 17:15:00 to 14-JUL-11 17:15:00 (MST-7)
Location: SUMATRA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TREASURE, MONTANA
From 14-JUL-11 17:30:00 to 14-JUL-11 17:30:00 (MST-7)
Location: HYSHAM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A estimated wind gust of 60 mph was reported in Hysham.

Hail in TREASURE, MONTANA
From 14-JUL-11 17:43:00 to 14-JUL-11 17:43:00 (MST-7)
Location: HYSHAM
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 14-JUL-11 18:50:00 to 14-JUL-11 18:50:00 (MST-7)
Location: COLSTRIP
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CUSTER, MONTANA
From 14-JUL-11 20:04:00 to 14-JUL-11 20:04:00 (MST-7)
Location: MIZPAH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in ROSEBUD, MONTANA
From 14-JUL-11 20:10:00 to 14-JUL-11 20:10:00 (MST-7)
Location: DOWLIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in FALLON, MONTANA
From 14-JUL-11 21:25:00 to 14-JUL-11 21:25:00 (MST-7)
Location: PLEVNA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated wind gust of 60 mph was reported 11 miles northwest of Baker.

Thunderstorm Wind in YELLOWSTONE, MONTANA
From 14-JUL-11 16:00:00 to 14-JUL-11 16:00:00 (MST-7)
Location: SHEPHERD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Winds were estimated at 70 mph 20 miles north of Shepherd. A shop door was ripped off, a tree was uprooted and a power line was downed in a yard.

Hail in GOLDEN VALLEY, MONTANA
From 14-JUL-11 13:30:00 to 14-JUL-11 13:30:00 (MST-7)
Location: BARBER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 15:20:00 to 14-JUL-11 15:20:00 (MST-7)
Location: LAUREL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Funnel Cloud in YELLOWSTONE, MONTANA
From 14-JUL-11 15:53:00 to 14-JUL-11 15:53:00 (MST-7)
Location: SHEPHERD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 14-JUL-11 16:00:00 to 14-JUL-11 16:00:00 (MST-7)
Location: (BIL)LOGAN ARPT BILL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter