The evening of August 8th, a very unstable air mass was in place across the upper Midwest with a warm front draped across the Twin Cities area, then eastward across west central Wisconsin. Initially, a strong cap suppressed thunderstorm development until around sunset as a cool front moved across east central Minnesota, and developed a supercell in the western part of Hennepin County. The supercell moved across the northern Twin Cities metro, then into Wisconsin.

Heavy Rain in WASHINGTON, MINNESOTA
From 08-AUG-09 19:30:00 to 08-AUG-09 21:30:00 (CST-6)
Location: HUGO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported ponding of water near the intersection of Highway 61 and County Road 147.

Thunderstorm Wind in ANOKA, MINNESOTA
From 08-AUG-09 20:16:00 to 08-AUG-09 20:16:00 (CST-6)
Location: CIRCLE PINES
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey determined that thunderstorm wind gusts of nearly 65 mph caused two dozen trees to be blown down in the City of Lexington, and also in extreme southeast Blaine, from the intersection of Restwood Road and Syndicate Avenue, to just west of 85th Avenue and Lexington Avenue. All trees were toppled from north to south.

Heavy Rain in ANOKA, MINNESOTA
From 08-AUG-09 19:00:00 to 08-AUG-09 20:30:00 (CST-6)
Location: LEXINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported one foot of water over a curb, near the intersection of 81st and Central, in Spring Lake Park, Minnesota.

Heavy Rain in ANOKA, MINNESOTA
From 08-AUG-09 19:30:00 to 08-AUG-09 20:45:00 (CST-6)
Location: BLAINE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported several inches of water over curbs near the Blaine, Lino Lakes border.

Hail in REDWOOD, MINNESOTA
From 08-AUG-09 15:00:00 to 08-AUG-09 15:05:00 (CST-6)
Location: WALNUT GROVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in HENNEPIN, MINNESOTA
From 08-AUG-09 19:33:00 to 08-AUG-09 19:49:00 (CST-6)
Location: MINNETRISTA
Tornado F-scale: EF1
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A damage survey determined that an EF1 tornado touched down in the northeast side of Minnetrista, or on the west side of the intersection of County Road 110, and 151. The tornado tracked east-northeast for approximately nine miles to the east side of County Road 101, or at Garland and 25th which is in the southwest portion of Plymouth. Numerous trees were snapped and dozens of other trees fell on homes and vehicles. Boats were tossed and roofs were partially removed from two homes and a business.

Thunderstorm Wind in RAMSEY, MINNESOTA
From 08-AUG-09 20:16:00 to 08-AUG-09 20:16:00 (CST-6)
Location: NEW BRIGHTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey determined that straight line winds caused a few trees to be blown down in Long Lake Park.

Thunderstorm Wind in WASHINGTON, MINNESOTA
From 08-AUG-09 20:45:00 to 08-AUG-09 20:45:00 (CST-6)
Location: WITHROW
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey determined that straight line winds blew down a few trees around Sunset Lake in southeast Hugo, Minnesota.