Around 3 pm CST, a fairly strong cold front was located along a line from Devils Lake, ND, to Hallock, MN. Throughout the evening, this cold front slowly sagged southward. By 6 pm CST, the front had reached a line from New Rockford, ND, to Roseau, MN. At this time, Jamestown, ND, reported a temperature of 86 degrees, while Devils Lake had dropped to 66 degrees. By midnight, the front was located along a line from Bemidji (MN) to Fargo (ND) to 20 miles south of Jamestown (ND). Behind the front, the temperature dropped to 39 degrees in Devils Lake a couple hours after midnight. Large hail, tornadoes, and flash flooding occurred during this event.

Hail in CLAY, MINNESOTA
From 18-MAY-07 19:12:00 to 18-MAY-07 19:12:00 (CST-6)
Location: MOORHEAD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLAY, MINNESOTA
From 18-MAY-07 19:20:00 to 18-MAY-07 19:20:00 (CST-6)
Location: MOORHEAD
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in CLAY, MINNESOTA
From 18-MAY-07 19:38:00 to 18-MAY-07 19:38:00 (CST-6)
Location: DILWORTH
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLAY, MINNESOTA
From 18-MAY-07 19:40:00 to 18-MAY-07 19:40:00 (CST-6)
Location: DILWORTH
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CLAY, MINNESOTA
From 18-MAY-07 19:55:00 to 18-MAY-07 19:55:00 (CST-6)
Location: MOORHEAD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CLAY, MINNESOTA
From 18-MAY-07 20:03:00 to 18-MAY-07 20:03:00 (CST-6)
Location: SABIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in CLAY, MINNESOTA
From 18-MAY-07 20:48:00 to 18-MAY-07 20:48:00 (CST-6)
Location: MOORHEAD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in NORMAN, MINNESOTA
From 18-MAY-07 22:33:00 to 18-MAY-07 22:33:00 (CST-6)
Location: RANUM
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in RED LAKE, MINNESOTA
From 18-MAY-07 16:45:00 to 18-MAY-07 16:45:00 (CST-6)
Location: WYLIE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in RED LAKE, MINNESOTA
From 18-MAY-07 16:55:00 to 18-MAY-07 16:55:00 (CST-6)
Location: RED LAKE FALLS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in POLK, MINNESOTA
From 18-MAY-07 17:15:00 to 18-MAY-07 17:15:00 (CST-6)
Location: MENTOR
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in POLK, MINNESOTA
From 18-MAY-07 17:39:00 to 18-MAY-07 17:39:00 (CST-6)
Location: ERSKINE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in CLAY, MINNESOTA
From 18-MAY-07 20:19:00 to 19-MAY-07 02:30:00 (CST-6)
Location: MOORHEAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Streets were flooded in the city of Moorhead. At the Moorhead Airport, taxiways and runways were also flooded.

Hail in PENNINGTON, MINNESOTA
From 18-MAY-07 16:50:00 to 18-MAY-07 16:50:00 (CST-6)
Location: ST HILAIRE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public