Strong surface heating and very moist air combined with significant vertical wind shear to set up an extremely unstable atmosphere. Multiple severe thunderstorms were supported across eastern Montana through the afternoon and evening hours.

Hail in GARFIELD, MONTANA
From 28-JUN-18 15:15:00 to 28-JUN-18 15:15:00 (MST-7)
Location: SAND SPGS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter size hail.

Hail in PETROLEUM, MONTANA
From 28-JUN-18 15:29:00 to 28-JUN-18 15:29:00 (MST-7)
Location: WINNETT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Petroleum County Emergency Manager reported quarter size hail and wind gusts up to 45 mph.

Hail in MCCONE, MONTANA
From 28-JUN-18 17:08:00 to 28-JUN-18 17:08:00 (MST-7)
Location: WELDON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported mainly quarter size hail with a few others up to the size of golf balls.

Thunderstorm Wind in MCCONE, MONTANA
From 28-JUN-18 17:54:00 to 28-JUN-18 17:54:00 (MST-7)
Location: VIDA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

McCone Electric Co-Op, Inc. reported, via social media, multiple main power transmission lines blown down.  McCone County dispatch reported powers lines and multiple transmission boxes blown down near the intersection of Nickwall Road and Highway 13.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 28-JUN-18 17:54:00 to 28-JUN-18 17:54:00 (MST-7)
Location: WOLF PT INTL AIRPORT(KOLF)
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Wolf Point ASOS site measured a 61 mph wind gust.

Thunderstorm Wind in MCCONE, MONTANA
From 28-JUN-18 17:47:00 to 28-JUN-18 17:47:00 (MST-7)
Location: CIRCLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement relayed a report through McCone County dispatch that five main transmission lines were blown down in the area around the town of Circle.

Thunderstorm Wind in MCCONE, MONTANA
From 28-JUN-18 17:50:00 to 28-JUN-18 17:50:00 (MST-7)
Location: CIRCLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a newly-constructed barn destroyed and siding and roof damage to a house in the town of Circle.  Time estimated by radar.

Thunderstorm Wind in RICHLAND, MONTANA
From 28-JUN-18 18:43:00 to 28-JUN-18 18:43:00 (MST-7)
Location: LAMBERT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a downed power pole and a few large tree branches, about 6 inches in diameter, snapped.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 28-JUN-18 18:25:00 to 28-JUN-18 18:25:00 (MST-7)
Location: POPLAR ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet site at the Poplar airport measured a 64 mph wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 28-JUN-18 18:35:00 to 28-JUN-18 18:35:00 (MST-7)
Location: ENID
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a pole barn and corral shelter damaged with debris spread out over a distance of more than half of a mile. Shingles were torn off a roof and metal roofing was peeled off a barn. A large grain cart was moved several feet and a fertilizer spreader was moved about 40 feet.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 28-JUN-18 18:58:00 to 28-JUN-18 18:58:00 (MST-7)
Location: CULBERTSON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported several pine trees snapped.

Thunderstorm Wind in DAWSON, MONTANA
From 28-JUN-18 19:15:00 to 28-JUN-18 19:15:00 (MST-7)
Location: GLENDIVE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated 60 mph wind gusts and reported heavy rain.

Thunderstorm Wind in RICHLAND, MONTANA
From 28-JUN-18 19:05:00 to 28-JUN-18 19:05:00 (MST-7)
Location: FAIRVIEW
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a large cottonwood tree was uprooted and two evergreen trees wer snapped.

Thunderstorm Wind in RICHLAND, MONTANA
From 28-JUN-18 19:18:00 to 28-JUN-18 19:18:00 (MST-7)
Location: SIDNEY
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS site at the Sidney airport measured a 63 mph wind gust.

Flash Flood in RICHLAND, MONTANA
From 28-JUN-18 19:30:00 to 28-JUN-18 19:30:00 (MST-7)
Location: FAIRVIEW
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported water over the roads in the town of Fairview high enough to cover the wheels on vehicles.

Thunderstorm Wind in VALLEY, MONTANA
From 28-JUN-18 16:44:00 to 28-JUN-18 16:44:00 (MST-7)
Location: KING COULEE RAWS
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

King Coulee RAWS site (KIGM8) measured a 58 mph wind gust.

Thunderstorm Wind in RICHLAND, MONTANA
From 28-JUN-18 17:54:00 to 28-JUN-18 17:54:00 (MST-7)
Location: ENID
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter estimated wind gusts in excess of 60 mph.