A strong low pressure system combined with favorable winds and an unstable atmosphere to support multiple severe thunderstorms across portions of northeast Montana. With relatively dry conditions at the surface in the west, damaging winds were the main result; but with more surface moisture in the east, large hail was more prevalent.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 19:30:00 to 03-JUL-18 19:30:00 (MST-7)
Location: DUCK CREEK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A National Weather Service employee reported multiple boat docks damaged and inaccessible at the Duck Creek Recreation Area.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 19:30:00 to 03-JUL-18 19:30:00 (MST-7)
Location: DUCK CREEK
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a 65 mph wind gust near the Duck Creek Recreation Area.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 19:35:00 to 03-JUL-18 19:35:00 (MST-7)
Location: FT PECK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Handar site on the east side of Fort Peck Dam measured a 60 mph wind gust.

Thunderstorm Wind in GARFIELD, MONTANA
From 03-JUL-18 19:41:00 to 03-JUL-18 19:41:00 (MST-7)
Location: HAXBY POINT
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public measured a 68 mph wind gust at the Rock Creek Recreation Area.

Thunderstorm Wind in DAWSON, MONTANA
From 03-JUL-18 19:25:00 to 03-JUL-18 19:25:00 (MST-7)
Location: GLENDIVE DAWSON ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported several large tree branches broken off and patio furniture blown 200 feet away.

Thunderstorm Wind in DAWSON, MONTANA
From 03-JUL-18 20:00:00 to 03-JUL-18 20:00:00 (MST-7)
Location: INTAKE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public estimated wind gusts up to 60 mph and pea size hail.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 19:02:00 to 03-JUL-18 19:02:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

A National Weather Service employee reported a 60 mph wind gust.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 20:50:00 to 03-JUL-18 20:50:00 (MST-7)
Location: FT PECK
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Handar site on the east side of Fort Peck Dam measured a 60 mph wind gust.

Thunderstorm Wind in DAWSON, MONTANA
From 03-JUL-18 20:30:00 to 03-JUL-18 20:48:00 (MST-7)
Location: LINDSAY DIVIDE DOT
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Lindsay Divide MT-200 site recorded severe wind gusts for at least 18 minutes. The peak wind gust of 67 mph was recorded at 20:48 MST.

Thunderstorm Wind in GARFIELD, MONTANA
From 03-JUL-18 18:40:00 to 03-JUL-18 18:40:00 (MST-7)
Location: JORDAN AIRPORT (KJDN)
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Garfield County Emergency Manager reported squall line wind damage to multiple aircraft at the Jordan airport, including a plane blown into a fence and a bent tail wing.

Thunderstorm Wind in GARFIELD, MONTANA
From 03-JUL-18 18:35:00 to 03-JUL-18 18:41:00 (MST-7)
Location: JORDAN
Magnitude: 82.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Jordan airport ASOS site recorded the passage of a squall line. Sustained wind speeds in excess of 40 mph lasted for at least 6 minutes. The peak wind gust of 94 mph was recorded at 18:41 MST.

Thunderstorm Wind in VALLEY, MONTANA
From 03-JUL-18 19:20:00 to 03-JUL-18 19:45:00 (MST-7)
Location: NASHUA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported damage to a tin roof and some playground equipment. Tin and wood debris was scattered across the property. The damaging winds lasted at least 25 minutes.

Thunderstorm Wind in MCCONE, MONTANA
From 03-JUL-18 20:15:00 to 03-JUL-18 20:15:00 (MST-7)
Location: BROCKWAY
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire crew from Badger Creek Wildfire measured sustained winds of 40 mph and a gust of 62 mph while providing standby support for a fireworks show in the town of Brockway.