Moderate to strong instability and favorable winds allowed severe thunderstorms to develop and push a severe squall line through portions of northeast Montana.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:00:00 to 18-JUN-16 18:00:00 (MST-7)
Location: DODSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts up to 60 mph.

Hail in PHILLIPS, MONTANA
From 18-JUN-16 18:06:00 to 18-JUN-16 18:06:00 (MST-7)
Location: PHILLIPS
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball sized hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:06:00 to 18-JUN-16 18:06:00 (MST-7)
Location: PHILLIPS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 70 mph wind gusts.

Hail in PHILLIPS, MONTANA
From 18-JUN-16 18:10:00 to 18-JUN-16 18:10:00 (MST-7)
Location: PHILLIPS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hen egg sized hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:09:00 to 18-JUN-16 18:09:00 (MST-7)
Location: PHILLIPS
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported 70 mph wind gusts along with large hail and zero visibility.  Time estimated by radar.

Hail in PHILLIPS, MONTANA
From 18-JUN-16 18:38:00 to 18-JUN-16 18:38:00 (MST-7)
Location: BOWDOIN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hen egg sized hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:40:00 to 18-JUN-16 18:40:00 (MST-7)
Location: SACO
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated 80 mph wind gusts.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:40:00 to 18-JUN-16 18:40:00 (MST-7)
Location: SACO
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large tree braches, up to 10 inches in diameter, broken off from high winds.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:45:00 to 18-JUN-16 18:45:00 (MST-7)
Location: SACO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated 60 mph wind gusts.

Hail in PHILLIPS, MONTANA
From 18-JUN-16 18:45:00 to 18-JUN-16 18:45:00 (MST-7)
Location: SACO
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:45:00 to 18-JUN-16 18:45:00 (MST-7)
Location: SACO
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported some siding was blown off his house from very strong winds.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:00:00 to 18-JUN-16 19:00:00 (MST-7)
Location: HINSDALE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A 70 mph wind gust was measured by the Saco US-2 DOT site.

Hail in ROOSEVELT, MONTANA
From 18-JUN-16 20:15:00 to 18-JUN-16 20:15:00 (MST-7)
Location: WOLF PT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported golf ball sized hail.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:17:00 to 18-JUN-16 19:25:00 (MST-7)
Location: GLASGOW
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Glasgow airport ASOS site measured 61 mph gusts with the passage of a squall line.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:25:00 to 18-JUN-16 19:30:00 (MST-7)
Location: GLASGOW
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Golf ball sized hail was observed at the Glasgow NWS office for up to 5 minutes.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:30:00 to 18-JUN-16 19:30:00 (MST-7)
Location: FT PECK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated 60 mph wind gusts.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:30:00 to 18-JUN-16 19:30:00 (MST-7)
Location: NASHUA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:36:00 to 18-JUN-16 19:36:00 (MST-7)
Location: NASHUA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail and 10 broken windows among various buildings. Time estimated from radar.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:50:00 to 18-JUN-16 19:50:00 (MST-7)
Location: LARSLAN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An off-duty NWS employee estimated 75 mph wind gusts.

Hail in VALLEY, MONTANA
From 18-JUN-16 20:00:00 to 18-JUN-16 20:00:00 (MST-7)
Location: FRAZER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported ping pong ball sized hail.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 18-JUN-16 20:23:00 to 18-JUN-16 20:23:00 (MST-7)
Location: WOLF PT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Wolf Point airport ASOS measured a 68 mph wind gust.

Hail in ROOSEVELT, MONTANA
From 18-JUN-16 20:25:00 to 18-JUN-16 20:25:00 (MST-7)
Location: WOLF PT
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball sized hail.

Hail in ROOSEVELT, MONTANA
From 18-JUN-16 20:25:00 to 18-JUN-16 20:25:00 (MST-7)
Location: WOLF PT INTL AIRPORT(KOLF)
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hen egg sized hail.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 18-JUN-16 20:31:00 to 18-JUN-16 20:31:00 (MST-7)
Location: MCDONALDS DOT
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The McDonalds MT-13 DOT sensor measured a 76 mph wind gust.

Hail in RICHLAND, MONTANA
From 18-JUN-16 21:05:00 to 18-JUN-16 21:05:00 (MST-7)
Location: ENID
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail along with winds up to 50 mph.

Thunderstorm Wind in SHERIDAN, MONTANA
From 18-JUN-16 21:20:00 to 18-JUN-16 21:20:00 (MST-7)
Location: HOMESTEAD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via social media, shingles blown off a roof.  Time estimated by radar.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:15:00 to 18-JUN-16 19:15:00 (MST-7)
Location: VANDALIA
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hen egg sized hail.

Hail in ROOSEVELT, MONTANA
From 18-JUN-16 20:20:00 to 18-JUN-16 20:20:00 (MST-7)
Location: WOLF PT
Magnitude: 3.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported near grapefruit sized hail, measuring 3.5 inches in diameter.

Hail in PHILLIPS, MONTANA
From 18-JUN-16 18:09:00 to 18-JUN-16 18:09:00 (MST-7)
Location: PHILLIPS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported quarter sized hail along with damaging winds and zero visibility. Time estimated by radar.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 17:50:00 to 18-JUN-16 17:50:00 (MST-7)
Location: DODSON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tree limbs up to 6 inches in diameter downed by strong winds.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:20:00 to 18-JUN-16 18:20:00 (MST-7)
Location: MALTA
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a semi-trailer toppled over by strong wind gusts.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:40:00 to 18-JUN-16 19:40:00 (MST-7)
Location: NASHUA
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported half dollar sized hail.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:17:00 to 18-JUN-16 18:17:00 (MST-7)
Location: MALTA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported tree limbs up to 5 inches in diameter downed by strong winds.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:40:00 to 18-JUN-16 19:40:00 (MST-7)
Location: BAYLOR
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported shingles blown off a roof and part of a chimney broken from strong winds.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:40:00 to 18-JUN-16 19:40:00 (MST-7)
Location: BAYLOR
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured 67 mph wind gusts.

Thunderstorm Wind in PHILLIPS, MONTANA
From 18-JUN-16 18:30:00 to 18-JUN-16 18:30:00 (MST-7)
Location: BOWDOIN
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A freight train was derailed by high winds.  Forty rail cars holding mostly empty containers were blown off the tracks.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:17:00 to 18-JUN-16 19:17:00 (MST-7)
Location: GLASGOW
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Off-duty NWS Employee reported half dollar sized hail.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:17:00 to 18-JUN-16 19:17:00 (MST-7)
Location: GLASGOW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Off-duty NWS Employee estimated 60 mph wind gusts based on tree damage in their yard.

Thunderstorm Wind in VALLEY, MONTANA
From 18-JUN-16 19:25:00 to 18-JUN-16 19:25:00 (MST-7)
Location: SAINT MARIE
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Public reported 7 power poles blown down along MT Highway 24.

Hail in VALLEY, MONTANA
From 18-JUN-16 19:25:00 to 18-JUN-16 19:25:00 (MST-7)
Location: GLASGOW
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Off-duty NWS employee reported hen egg sized hail.