A strong upper level disturbance within an unstable northwest flow aloft moved across eastern Montana during the afternoon and evening hours of the 27th. Aided by a strong jet streak, this disturbance resulted in a few long-lived super cell thunderstorms across the central and eastern portions of the Billings Forecast Area. These thunderstorms produced very large hail with the largest size being tennis ball size southeast of Colstrip, Montana in Rosebud County.

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 15:26:00 to 27-JUL-16 15:26:00 (MST-7)
Location: LAUREL MUNI ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 14:45:00 to 27-JUL-16 14:45:00 (MST-7)
Location: POMPEYS PILLAR
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 14:36:00 to 27-JUL-16 14:36:00 (MST-7)
Location: POMPEYS PILLAR
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MUSSELSHELL, MONTANA
From 27-JUL-16 13:20:00 to 27-JUL-16 13:20:00 (MST-7)
Location: ROUNDUP
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MUSSELSHELL, MONTANA
From 27-JUL-16 13:20:00 to 27-JUL-16 13:20:00 (MST-7)
Location: KLEIN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in MUSSELSHELL, MONTANA
From 27-JUL-16 13:15:00 to 27-JUL-16 13:15:00 (MST-7)
Location: ROUNDUP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in MUSSELSHELL, MONTANA
From 27-JUL-16 13:14:00 to 27-JUL-16 13:14:00 (MST-7)
Location: ROUNDUP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MUSSELSHELL, MONTANA
From 27-JUL-16 13:07:00 to 27-JUL-16 13:07:00 (MST-7)
Location: ROUNDUP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ROSEBUD, MONTANA
From 27-JUL-16 19:01:00 to 27-JUL-16 19:01:00 (MST-7)
Location: BRANDENBERG
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in POWDER RIVER, MONTANA
From 27-JUL-16 19:32:00 to 27-JUL-16 19:32:00 (MST-7)
Location: COALWOOD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in TREASURE, MONTANA
From 27-JUL-16 18:39:00 to 27-JUL-16 18:39:00 (MST-7)
Location: HYSHAM
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 17:18:00 to 27-JUL-16 17:18:00 (MST-7)
Location: LOCKWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 17:11:00 to 27-JUL-16 17:11:00 (MST-7)
Location: BILLINGS HGTS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 17:09:00 to 27-JUL-16 17:09:00 (MST-7)
Location: BILLINGS HGTS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CUSTER, MONTANA
From 27-JUL-16 20:05:00 to 27-JUL-16 20:05:00 (MST-7)
Location: VOLBORG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 17:03:00 to 27-JUL-16 17:03:00 (MST-7)
Location: BILLINGS HGTS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in YELLOWSTONE, MONTANA
From 27-JUL-16 17:03:00 to 27-JUL-16 17:03:00 (MST-7)
Location: BILLINGS HGTS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POWDER RIVER, MONTANA
From 27-JUL-16 20:30:00 to 27-JUL-16 20:30:00 (MST-7)
Location: (4BQ)BROADUS ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in ROSEBUD, MONTANA
From 27-JUL-16 19:53:00 to 27-JUL-16 19:53:00 (MST-7)
Location: COLSTRIP
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ROSEBUD, MONTANA
From 27-JUL-16 19:35:00 to 27-JUL-16 19:35:00 (MST-7)
Location: COLSTRIP
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter