A low pressure system moved into the Pacific Northwest coast bringing a more moist, unstable, and southwesterly flow to the region. This helped generate showers and
thunderstorms over the higher terrain of these areas. The frontal boundary associated with this system moved into western Montana later in the day bringing the chance of severe thunderstorms, damaging winds, large hail, and heavy rainfall to the area. Thunderstorm activity decreased overnight.

Hail in GLACIER, MONTANA
From 18-JUN-13 16:05:00 to 18-JUN-13 16:05:00 (MST-7)
Location: BROWNING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Severe hail measuring 1.75 inches (approximately golf ball sized) was reported in Browning, MT.

Hail in GLACIER, MONTANA
From 18-JUN-13 16:12:00 to 18-JUN-13 16:12:00 (MST-7)
Location: BROWNING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe hail measuring 1.75 inches (approximately golf ball sized) was reported 1 mile S of Browning, MT.

Hail in GLACIER, MONTANA
From 18-JUN-13 16:25:00 to 18-JUN-13 16:25:00 (MST-7)
Location: BROWNING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe hail measuring 1.00 inches (approximately quarter sized) was reported 7 miles NNE of Browning, MT.

Hail in GLACIER, MONTANA
From 18-JUN-13 16:57:00 to 18-JUN-13 16:57:00 (MST-7)
Location: ST MARY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Severe hail estimated at 1.00 inches (approximately quarter sized) was reported 4 miles SSE of Saint Mary, MT. A motorist on MT Highway 49 reported vehicle damage.

High Wind in CASCADE, MONTANA
From 18-JUN-13 16:41:00 to 18-JUN-13 16:41:00 (MST-7)
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

High winds estimated at 52KT (60MPH) were reported 2 miles W of Vaughn, MT.

Hail in PONDERA, MONTANA
From 18-JUN-13 19:15:00 to 18-JUN-13 19:15:00 (MST-7)
Location: BRADY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Severe hail measuring 1.50 inches (approximately ping pong ball sized) was reported 5 miles SSE of Brady, MT.

Hail in TOOLE, MONTANA
From 18-JUN-13 19:49:00 to 18-JUN-13 19:49:00 (MST-7)
Location: SHELBY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain, pea sized hail, and a few severe hailstones measuring 1.00 inches (approximately quarter sized) were reported in Shelby, MT.

Flash Flood in PONDERA, MONTANA
From 18-JUN-13 19:31:00 to 18-JUN-13 19:31:00 (MST-7)
Location: BRADY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple public calls about flash flooding due to thunderstorms in the area. Water was reported flowing over portions of Interstate 15 near Brady.

High Wind in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 18-JUN-13 19:00:00 to 18-JUN-13 19:00:00 (MST-7)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High winds measuring 62KT (71MPH) were reported at Logan Pass. Thunderstorm activity was noted in the area on radar.

Hail in LEWIS AND CLARK, MONTANA
From 17-JUN-13 17:50:00 to 17-JUN-13 17:50:00 (MST-7)
Location: AUGUSTA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Severe hail measuring 1.75 inches (approximately golf ball sized) was reported 17 miles WNW of Augusta, MT. Reports of vehicle and metal roof damage were also received.

Hail in CASCADE, MONTANA
From 18-JUN-13 18:36:00 to 18-JUN-13 18:36:00 (MST-7)
Location: VAUGHN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Severe hail measuring 1.00 inches (approximately quarter sized) was reported 2 miles W of Vaughn, MT.

Hail in BROADWATER, MONTANA
From 17-JUN-13 19:15:00 to 17-JUN-13 19:15:00 (MST-7)
Location: WINSTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Severe hail estimated at 1.00 inches (approximately quarter sized) was reported at Goose Bay Marina 8 miles ENE of Winston, MT.