Strong supercells formed over the region, producing large hail, damaging winds, funnel clouds and at least one tornado.

Hail in WIBAUX, MONTANA
From 30-JUN-09 16:59:00 to 30-JUN-09 17:09:00 (MST-7)
Location: WIBAUX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two reports of one inch hail occurred with this storm.

Hail in WIBAUX, MONTANA
From 30-JUN-09 17:30:00 to 30-JUN-09 17:30:00 (MST-7)
Location: CARLYLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Funnel Cloud in WIBAUX, MONTANA
From 30-JUN-09 16:38:00 to 30-JUN-09 16:38:00 (MST-7)
Location: WIBAUX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported several short lived funnel clouds.

Hail in WIBAUX, MONTANA
From 30-JUN-09 16:38:00 to 30-JUN-09 16:40:00 (MST-7)
Location: WIBAUX
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Report of Quarter-size hail at 1638 (reported by spotter) and at at 1640 (reported by County Official). Golfball size hail occurred at 1640 (reported by spotter).

Hail in WIBAUX, MONTANA
From 30-JUN-09 16:45:00 to 30-JUN-09 17:30:00 (MST-7)
Location: CARLYLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail ranged from pea to golfball-size.  There were several supercellular storms that moved over the area back to back and there were no real breaks between the hailstorms during the entire time period.

Hail in WIBAUX, MONTANA
From 30-JUN-09 17:04:00 to 30-JUN-09 17:04:00 (MST-7)
Location: CARLYLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in WIBAUX, MONTANA
From 30-JUN-09 16:45:00 to 30-JUN-09 16:45:00 (MST-7)
Location: WIBAUX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blew over BBQ grill.

Thunderstorm Wind in WIBAUX, MONTANA
From 30-JUN-09 17:20:00 to 30-JUN-09 17:20:00 (MST-7)
Location: CARLYLE
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in WIBAUX, MONTANA
From 30-JUN-09 16:54:00 to 30-JUN-09 17:04:00 (MST-7)
Location: WIBAUX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported 1.0 to 1.5 inches.

Heavy Rain in DAWSON, MONTANA
From 30-JUN-09 16:43:00 to 30-JUN-09 16:58:00 (MST-7)
Location: INTAKE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported two inches of rainfall.

Hail in WIBAUX, MONTANA
From 30-JUN-09 17:00:00 to 30-JUN-09 17:04:00 (MST-7)
Location: CARLYLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hailstorm moved southeast, dropping up to golfball-size hail.

Hail in RICHLAND, MONTANA
From 30-JUN-09 14:45:00 to 30-JUN-09 14:45:00 (MST-7)
Location: ENID
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in RICHLAND, MONTANA
From 30-JUN-09 15:55:00 to 30-JUN-09 16:15:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 58.00 MG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Initial wind gust was from the west-northwest. Straight line wind damage, or a macroburst was the cause of the damage in Sidney. Power was out for several hours in the Sidney area as power lines were broken by fallen trees and branches. The majority of the damage appears to be with uprooted and snapped evergreen trees, although some cottonwoods and poplars were also damaged. A storage building was destroyed just north of Sidney. A window was ripped out of its frame at 405 pm on the east side of town.

Thunderstorm Wind in RICHLAND, MONTANA
From 30-JUN-09 16:15:00 to 30-JUN-09 16:15:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind gust from the east.

Tornado in WIBAUX, MONTANA
From 30-JUN-09 17:08:00 to 30-JUN-09 17:11:00 (MST-7)
Location: CARLYLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

A storm chasing tour group witnessed a tornado for 3 minutes before it dissipated. It was in open country and eventually became rain-wrapped.  Tornado times are based on video of the event.

Funnel Cloud in DAWSON, MONTANA
From 30-JUN-09 15:46:00 to 30-JUN-09 15:46:00 (MST-7)
Location: GLENDIVE DAWSON ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported several funnel clouds to his east.

Hail in DAWSON, MONTANA
From 30-JUN-09 16:01:00 to 30-JUN-09 16:11:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DAWSON, MONTANA
From 30-JUN-09 15:58:00 to 30-JUN-09 15:58:00 (MST-7)
Location: INTAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in RICHLAND, MONTANA
From 30-JUN-09 14:47:00 to 30-JUN-09 14:47:00 (MST-7)
Location: ENID
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy Rain in RICHLAND, MONTANA
From 30-JUN-09 16:00:00 to 30-JUN-09 16:30:00 (MST-7)
Location: SIDNEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Very high winds led to under reported rainfall in gages.  Several observers in the area reported two to four inches of rain.  Minor street flooding occurred in town as leaves and branches clogged drains.  The airport AWOS reported 1.84 inches.

Heavy Rain in WIBAUX, MONTANA
From 30-JUN-09 17:05:00 to 30-JUN-09 17:20:00 (MST-7)
Location: CARLYLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter received 1.1 inches of rain.

Hail in RICHLAND, MONTANA
From 30-JUN-09 15:50:00 to 30-JUN-09 15:50:00 (MST-7)
Location: SAVAGE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pea to penny-sized hail was reported. Winds were estimated at around 30 mph.