Moderate surface moisture combined with a short-wave disturbance and a very favorable vertical wind field to produce a number of severe thunderstorms across portions of northeast Montana, including a rare gustnado.

Hail in PHILLIPS, MONTANA
From 21-JUN-16 15:00:00 to 21-JUN-16 15:00:00 (MST-7)
Location: DODSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in PHILLIPS, MONTANA
From 21-JUN-16 15:25:00 to 21-JUN-16 15:25:00 (MST-7)
Location: MALTA ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported penny sized hail.

Hail in PHILLIPS, MONTANA
From 21-JUN-16 15:25:00 to 21-JUN-16 15:25:00 (MST-7)
Location: MALTA ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported penny sized hail.

Thunderstorm Wind in VALLEY, MONTANA
From 21-JUN-16 16:20:00 to 21-JUN-16 16:20:00 (MST-7)
Location: KING COULEE RAWS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

A 59 mph wind gust was recorded at the King Coulee RAWS site.

Hail in VALLEY, MONTANA
From 21-JUN-16 17:00:00 to 21-JUN-16 17:00:00 (MST-7)
Location: SAINT MARIE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported golf ball sized hail.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 21-JUN-16 17:58:00 to 21-JUN-16 17:58:00 (MST-7)
Location: WOLF PT INTL AIRPORT(KOLF)
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 ROOSEVELT, MONTANA
From 21-JUN-16 17:58:00 to 21-JUN-16 17:58:00 (MST-7)
Location: WOLF PT INTL AIRPORT(KOLF)
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of quarters.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 21-JUN-16 18:20:00 to 21-JUN-16 18:20:00 (MST-7)
Location: POPLAR RAWS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

A 59 mph wind gust was recorded at the Poplar RAWS site.

Hail in RICHLAND, MONTANA
From 21-JUN-16 18:34:00 to 21-JUN-16 18:34:00 (MST-7)
Location: ENID
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in RICHLAND, MONTANA
From 21-JUN-16 18:55:00 to 21-JUN-16 18:55:00 (MST-7)
Location: SIOUX PASS DOT
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 RICHLAND, MONTANA
From 21-JUN-16 19:08:00 to 21-JUN-16 19:08:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A 64 mph wind gust was recorded at the Sioux Pass MT-16 DOT site.

Hail in RICHLAND, MONTANA
From 21-JUN-16 19:10:00 to 21-JUN-16 19:10:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Richland County DES Coordinator reported golf ball sized hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 21-JUN-16 18:27:00 to 21-JUN-16 18:27:00 (MST-7)
Location: ENID
Magnitude: 83.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A medium sized tree was snapped and part of a metal roof was torn back from a large metal storage building.

Thunderstorm Wind in RICHLAND, MONTANA
From 21-JUN-16 18:30:00 to 21-JUN-16 18:30:00 (MST-7)
Location: ENID
Magnitude: 87.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A gustnado caused damage to a farmstead. A roof was peeled back on a metal building. Hay bales were blown off a stack. Numerous trees were damaged, uprooted or snapped off with many large limbs lost.  Some large tree limbs landed on a farm house.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 21-JUN-16 18:12:00 to 21-JUN-16 18:17:00 (MST-7)
Location: SPROLE
Magnitude: 78.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Many cottonwood trees blown over. Three sections of a pivot irrigator were blown over.  A barn roof was damaged.  Event time estimated by radar.

Hail in RICHLAND, MONTANA
From 21-JUN-16 19:01:00 to 21-JUN-16 19:01:00 (MST-7)
Location: SIOUX PASS DOT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via social media, golf ball sized hail.

Hail in RICHLAND, MONTANA
From 21-JUN-16 17:45:00 to 21-JUN-16 17:45:00 (MST-7)
Location: FAIRVIEW
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported nickel sized hail.

Thunderstorm Wind in RICHLAND, MONTANA
From 21-JUN-16 18:45:00 to 21-JUN-16 18:45:00 (MST-7)
Location: ENID
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported large tree branches downed by high winds, along with possible damage to structures.  Time estimated form radar.