A strong low pressure trough from the west in an unstable atmosphere with very favorable vertical wind shear combined with moist air at the surface sustained severe thunderstorms through portions of northeast Montana through the mid-day and afternoon hours.

Hail in PRAIRIE, MONTANA
From 01-JUN-18 12:40:00 to 01-JUN-18 12:40:00 (MST-7)
Location: MC CLOUD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail along with 40 mph winds.

Thunderstorm Wind in PRAIRIE, MONTANA
From 01-JUN-18 12:52:00 to 01-JUN-18 12:52:00 (MST-7)
Location: MC CLOUD
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Big Sheep Mountain RAWS site measured a 68 mph wind gust.  Time estimated by radar.

Thunderstorm Wind in PRAIRIE, MONTANA
From 01-JUN-18 13:10:00 to 01-JUN-18 13:10:00 (MST-7)
Location: MC CLOUD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 60 mph wind gusts, along with hail up to the size of nickels.

Hail in DAWSON, MONTANA
From 01-JUN-18 13:35:00 to 01-JUN-18 13:35:00 (MST-7)
Location: LINDSAY DIVIDE DOT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:27:00 to 01-JUN-18 14:27:00 (MST-7)
Location: ENID
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail and wind gusts up to 55 mph.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:35:00 to 01-JUN-18 14:35:00 (MST-7)
Location: LAMBERT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter size hail and heavy rain.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:35:00 to 01-JUN-18 14:35:00 (MST-7)
Location: LAMBERT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via Facebook, golf ball size hail on the south edge of the town of Lambert.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:36:00 to 01-JUN-18 14:36:00 (MST-7)
Location: ENID
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via social media, ping pong ball size hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 01-JUN-18 14:46:00 to 01-JUN-18 14:46:00 (MST-7)
Location: ENID
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

County fire department measured a 72 mph wind gust and reported heavy rain and reduced visibility.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:50:00 to 01-JUN-18 14:50:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail drifting on roadways, some broken windows, and heavy rain.

Hail in RICHLAND, MONTANA
From 01-JUN-18 14:50:00 to 01-JUN-18 14:50:00 (MST-7)
Location: SIDNEY AIRPORT (KSDY)
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 01-JUN-18 15:00:00 to 01-JUN-18 15:00:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a 62 mph wind gust.

Hail in RICHLAND, MONTANA
From 01-JUN-18 15:00:00 to 01-JUN-18 15:00:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball size hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 01-JUN-18 15:07:00 to 01-JUN-18 15:07:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a ranch archway snapped and some barn roof damage.