Warm, moist air and converging surface winds allowed thunderstorms to easily form along a subtle boundary, then suddenly grow severe as they moved toward the east and southeast into an even more favorable environment.

Flash Flood in PRAIRIE, MONTANA
From 30-JUL-19 19:00:00 to 30-JUL-19 19:00:00 (MST-7)
Location: TERRY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Prairie County DES Coordinator reported water over I-94 near Terry.

Thunderstorm Wind in PRAIRIE, MONTANA
From 30-JUL-19 17:35:00 to 30-JUL-19 17:35:00 (MST-7)
Location: TERRY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Prairie County DES Coordinator reported a large tree limb blow down.  Wind gust speed estimated.

Thunderstorm Wind in PRAIRIE, MONTANA
From 30-JUL-19 17:45:00 to 30-JUL-19 17:45:00 (MST-7)
Location: TERRY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported gas station awning torn off and blown 100 to 200 feet away into a nearby field, a billboard blown in and hanging from its posts, and another small structure with roof damage. Wind gust speed estimated.

Thunderstorm Wind in PRAIRIE, MONTANA
From 30-JUL-19 17:45:00 to 30-JUL-19 17:45:00 (MST-7)
Location: TERRY
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via social media, a tree blown down on a house in Terry.

Hail in VALLEY, MONTANA
From 30-JUL-19 16:55:00 to 30-JUL-19 16:55:00 (MST-7)
Location: DUCK CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter size hail.

Hail in VALLEY, MONTANA
From 30-JUL-19 16:56:00 to 30-JUL-19 16:56:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail.

Hail in VALLEY, MONTANA
From 30-JUL-19 16:55:00 to 30-JUL-19 17:00:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter size hail.

Hail in VALLEY, MONTANA
From 30-JUL-19 17:00:00 to 30-JUL-19 17:00:00 (MST-7)
Location: GLASGOW INTL AIRPORT (KGGW)
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported golf ball size hail.

Hail in PRAIRIE, MONTANA
From 30-JUL-19 17:45:00 to 30-JUL-19 17:45:00 (MST-7)
Location: TERRY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported hail up to the size of half dollars.

Thunderstorm Wind in PRAIRIE, MONTANA
From 30-JUL-19 17:45:00 to 30-JUL-19 17:45:00 (MST-7)
Location: TERRY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Storm chaser reported extensive damage in Terry and within 2 miles of Terry.

Hail in MCCONE, MONTANA
From 30-JUL-19 18:05:00 to 30-JUL-19 18:05:00 (MST-7)
Location: CIRCLE MCCONE CO ARP
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported, via social media, half dollar size hail.

Hail in DANIELS, MONTANA
From 30-JUL-19 18:26:00 to 30-JUL-19 18:26:00 (MST-7)
Location: RICHLAND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of golf balls.

Hail in DAWSON, MONTANA
From 30-JUL-19 18:32:00 to 30-JUL-19 18:32:00 (MST-7)
Location: LINDSAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter size hail.

Hail in MCCONE, MONTANA
From 30-JUL-19 18:45:00 to 30-JUL-19 18:45:00 (MST-7)
Location: WELDON
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball size hail.

Hail in DANIELS, MONTANA
From 30-JUL-19 19:10:00 to 30-JUL-19 19:10:00 (MST-7)
Location: PEERLESS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported hail up to the size of hen eggs.

Hail in DANIELS, MONTANA
From 30-JUL-19 19:19:00 to 30-JUL-19 19:19:00 (MST-7)
Location: FOUR BUTTES
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.

Hail in MCCONE, MONTANA
From 30-JUL-19 15:45:00 to 30-JUL-19 15:45:00 (MST-7)
Location: WELDON
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.

Hail in VALLEY, MONTANA
From 30-JUL-19 04:35:00 to 30-JUL-19 04:45:00 (MST-7)
Location: DUCK CREEK
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported hail up to the size of ping pong balls.