The Northern Rockies were under southwest flow ahead of a large low pressure system off the West Coast. A shortwave trough and associated jet streak were moving through the southwest flow providing upper level forcing for thunderstorms. Precipitable water values ranged from 0.75 to 1.00 inches, with deep shear of 50 kts, and CAPE values of 500 to 1000 J/kg. Short range models highlighted long-lived storm modes over the area. A convective watch was issued around 3 pm MDT highlighting an atmosphere favorable for strong thunderstorm development.

Hail in MINERAL, MONTANA
From 08-JUN-16 16:04:00 to 08-JUN-16 16:19:00 (MST-7)
Location: SALTESE
Magnitude: 1.00 
Property damage: 20.00K
Reported by: Public

A business in Saltese, MT reported quarter or larger size hail. Winds blew down some tree limbs, and the hail dented cars. The worst part of the storm lasted about 15 minutes.

Hail in FLATHEAD, MONTANA
From 08-JUN-16 17:07:00 to 08-JUN-16 17:12:00 (MST-7)
Location: EVERGREEN
Magnitude: 1.25 
Property damage: 10.00K
Reported by: Public

Larger than quarter sized hail was reported at residence north of MT-35 bridge over Flathead River. The hail punched larger than golf ball-sized holes in plastic chicken coop roofing, destroyed residence���s surveillance camera, and dented their metal barn roof.

Hail in FLATHEAD, MONTANA
From 08-JUN-16 16:02:00 to 08-JUN-16 16:07:00 (MST-7)
Location: KALISPELL
Magnitude: 1.00 
Reported by: Public

The public reported quarter-sized hail from a thunderstorm west of Kalispell, MT.

Hail in FLATHEAD, MONTANA
From 08-JUN-16 16:56:00 to 08-JUN-16 17:01:00 (MST-7)
Location: KALISPELL
Magnitude: 1.00 
Reported by: Public

The public sent a photo showing multiple hailstones as large as quarters in Kalispell, MT.

Hail in FLATHEAD, MONTANA
From 08-JUN-16 17:14:00 to 08-JUN-16 17:19:00 (MST-7)
Location: LASALLE
Magnitude: 1.00 
Reported by: Public

The public reported 1-inch hail via social media 3 miles south of Columbia Falls, MT.

Heavy Rain in LAKE, MONTANA
From 08-JUN-16 17:35:00 to 08-JUN-16 17:45:00 (MST-7)
Location: CHARLO
Property damage: 1.00K
Reported by: Public

A resident in Charlo, MT reported 0.80 inches of rain in 10 min with minor street flooding.

Thunderstorm Wind in POWELL, MONTANA
From 08-JUN-16 20:38:00 to 08-JUN-16 20:48:00 (MST-7)
Location: AVON
Magnitude: 52.00 MG
Reported by: AWSS

The Montana DOT weather sensor north of Avon, MT reported a gust of 60 mph between 9:38pm MDT and 9:45pm MDT. Sustained winds at this time were 49 mph.

Thunderstorm Wind in LAKE, MONTANA
From 08-JUN-16 17:30:00 to 08-JUN-16 17:35:00 (MST-7)
Location: CHARLO
Magnitude: 52.00 EG
Property damage: 2.00K
Reported by: Public

A 25 foot power pole was snapped by the wind in Charlo, MT. The wind was strong enough to make it difficult for resident to open his front door.

Strong Wind in BUTTE / BLACKFOOT REGION, MONTANA
From 08-JUN-16 19:45:00 to 08-JUN-16 19:55:00 (MST-7)
Magnitude: 46.00 MG
Property damage: 0.25K
Reported by: AWSS

The weather station at the Anaconda, MT airfield reported a wind gust to 53 mph between 8pm and 9pm MDT, likely as the line of storms arrived around 8:45pm. County officials reported small branches down and one tree knocked over as well, but there was no known damage to property.