A strong cold front crossed the area and produced widespread severe weather across northeast Montana.  This was the biggest outbreak of severe weather during the month of May during at least the last 5 years.

Hail in DAWSON, MONTANA
From 13-MAY-07 20:00:00 to 13-MAY-07 20:00:00 (MST-7)
Location: GLENDIVE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in ROOSEVELT, MONTANA
From 13-MAY-07 16:50:00 to 13-MAY-07 16:50:00 (MST-7)
Location: WOLF PT
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

The hail broke a garage window.

Hail in RICHLAND, MONTANA
From 13-MAY-07 20:05:00 to 13-MAY-07 20:25:00 (MST-7)
Location: CRANE
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail covered the ground and lasted for 20 minutes.

Thunderstorm Wind in PRAIRIE, MONTANA
From 13-MAY-07 20:14:00 to 13-MAY-07 20:14:00 (MST-7)
Location: TERRY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Mature pine trees were bending over in the wind.

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 19:50:00 to 13-MAY-07 19:50:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Farm barrels were picked up by the wind and tossed across the property.

Hail in DAWSON, MONTANA
From 13-MAY-07 19:35:00 to 13-MAY-07 19:35:00 (MST-7)
Location: LINDSAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GARFIELD, MONTANA
From 13-MAY-07 19:17:00 to 13-MAY-07 19:17:00 (MST-7)
Location: COHAGEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PRAIRIE, MONTANA
From 13-MAY-07 19:10:00 to 13-MAY-07 19:10:00 (MST-7)
Location: MC CLOUD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GARFIELD, MONTANA
From 13-MAY-07 18:15:00 to 13-MAY-07 18:15:00 (MST-7)
Location: VAN NORMAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in VALLEY, MONTANA
From 13-MAY-07 15:30:00 to 13-MAY-07 15:30:00 (MST-7)
Location: VANDALIA
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PRAIRIE, MONTANA
From 13-MAY-07 18:44:00 to 13-MAY-07 18:54:00 (MST-7)
Location: MC CLOUD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Pea sized hail increased to quarter size hail and lasted for 10 minutes.

Thunderstorm Wind in PRAIRIE, MONTANA
From 13-MAY-07 20:12:00 to 13-MAY-07 20:12:00 (MST-7)
Location: TERRY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, MONTANA
From 13-MAY-07 20:14:00 to 13-MAY-07 20:24:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 20:15:00 to 13-MAY-07 20:15:00 (MST-7)
Location: GLENDIVE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PRAIRIE, MONTANA
From 13-MAY-07 20:20:00 to 13-MAY-07 20:20:00 (MST-7)
Location: TERRY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, MONTANA
From 13-MAY-07 20:10:00 to 13-MAY-07 20:10:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PRAIRIE, MONTANA
From 13-MAY-07 20:30:00 to 13-MAY-07 20:30:00 (MST-7)
Location: TERRY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DAWSON, MONTANA
From 13-MAY-07 20:40:00 to 13-MAY-07 20:40:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 20:40:00 to 13-MAY-07 20:40:00 (MST-7)
Location: GLENDIVE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WIBAUX, MONTANA
From 13-MAY-07 21:04:00 to 13-MAY-07 21:04:00 (MST-7)
Location: WIBAUX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in RICHLAND, MONTANA
From 13-MAY-07 20:20:00 to 13-MAY-07 20:20:00 (MST-7)
Location: CRANE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, MONTANA
From 13-MAY-07 19:03:00 to 13-MAY-07 19:08:00 (MST-7)
Location: LINDSAY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Golfball sized hail was followed by nickel sized hail.

Hail in DAWSON, MONTANA
From 13-MAY-07 19:00:00 to 13-MAY-07 19:00:00 (MST-7)
Location: LINDSAY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GARFIELD, MONTANA
From 13-MAY-07 19:00:00 to 13-MAY-07 19:00:00 (MST-7)
Location: COHAGEN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PRAIRIE, MONTANA
From 13-MAY-07 19:30:00 to 13-MAY-07 19:30:00 (MST-7)
Location: TERRY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DAWSON, MONTANA
From 13-MAY-07 19:30:00 to 13-MAY-07 19:30:00 (MST-7)
Location: LINDSAY
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 19:30:00 to 13-MAY-07 19:30:00 (MST-7)
Location: BLOOMFIELD
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, MONTANA
From 13-MAY-07 20:05:00 to 13-MAY-07 20:05:00 (MST-7)
Location: GLENDIVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter sized hail mixed with dime size hail.

Hail in VALLEY, MONTANA
From 13-MAY-07 18:15:00 to 13-MAY-07 18:15:00 (MST-7)
Location: DUCK CREEK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 20:10:00 to 13-MAY-07 20:10:00 (MST-7)
Location: GLENDIVE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAWSON, MONTANA
From 13-MAY-07 20:10:00 to 13-MAY-07 20:10:00 (MST-7)
Location: GLENDIVE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAWSON, MONTANA
From 13-MAY-07 20:04:00 to 13-MAY-07 20:04:00 (MST-7)
Location: GLENDIVE DAWSON ARPT
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

This report was taken from the Glendive AWOS.

Thunderstorm Wind in RICHLAND, MONTANA
From 13-MAY-07 20:35:00 to 13-MAY-07 20:35:00 (MST-7)
Location: (SDY)SIDNEY-RICHLAND
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

This report was taken from the Sidney AWOS.

Thunderstorm Wind in ROOSEVELT, MONTANA
From 13-MAY-07 19:00:00 to 13-MAY-07 19:00:00 (MST-7)
Location: (OLF)WOLF PT INT ARP
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

This report was taken from the Wolf Point ASOS.

Thunderstorm Wind in VALLEY, MONTANA
From 13-MAY-07 18:10:00 to 13-MAY-07 18:10:00 (MST-7)
Location: GLASGOW
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

This observation was from the King Coulee RAWS site.

Hail in MCCONE, MONTANA
From 13-MAY-07 18:50:00 to 13-MAY-07 18:50:00 (MST-7)
Location: BROCKWAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail of 3/4 in diameter covered the ground.

Hail in DAWSON, MONTANA
From 13-MAY-07 19:03:00 to 13-MAY-07 19:03:00 (MST-7)
Location: LINDSAY
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter also reported possible roof damage.

Thunderstorm Wind in WIBAUX, MONTANA
From 13-MAY-07 20:55:00 to 13-MAY-07 20:55:00 (MST-7)
Location: WIBAUX
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in VALLEY, MONTANA
From 13-MAY-07 15:35:00 to 13-MAY-07 15:35:00 (MST-7)
Location: GLASGOW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The wind was accompanied by half inch diameter hail.

Hail in RICHLAND, MONTANA
From 13-MAY-07 20:00:00 to 13-MAY-07 20:00:00 (MST-7)
Location: SAVAGE
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

The hail cracked a windshield.