A warm front and unstable air mass combined to produce severe thunderstorms across southern Cass, Crow Wing, and Pine counties during the evening hours of August 13. A fast-moving severe thunderstorm in the Brainerd area brought large hail and winds up to 60 mph that downed hundreds of trees and damaged homes. Several businesses reported roof damage and a two-story structure at a local speedway collapsed. Docks along several lakes in Crow Wing County also reported damage. At least 7,700 customers lost power in the Brainerd Lakes region, according to Crow Wing Power.

Thunderstorm Wind in CASS, MINNESOTA
From 13-AUG-07 18:10:00 to 13-AUG-07 18:10:00 (CST-6)
Location: PILLAGER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two 18-inch diameter trees were blown down by the strong thunderstorm winds.

Thunderstorm Wind in CROW WING, MINNESOTA
From 13-AUG-07 18:40:00 to 13-AUG-07 18:40:00 (CST-6)
Location: GARRISON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees were blown down by the strong thunderstorm winds.

Hail in CASS, MINNESOTA
From 13-AUG-07 18:10:00 to 13-AUG-07 18:10:00 (CST-6)
Location: GULL LAKE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:10:00 to 13-AUG-07 18:10:00 (CST-6)
Location: CROW WING
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, MINNESOTA
From 13-AUG-07 18:15:00 to 13-AUG-07 18:15:00 (CST-6)
Location: PILLAGER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, MINNESOTA
From 13-AUG-07 18:08:00 to 13-AUG-07 18:08:00 (CST-6)
Location: PILLAGER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts to 50 knots were also recorded.

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:11:00 to 13-AUG-07 18:11:00 (CST-6)
Location: BRAINERD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust to 50 knots was also recorded.

Hail in CASS, MINNESOTA
From 13-AUG-07 18:16:00 to 13-AUG-07 18:16:00 (CST-6)
Location: SYLVAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:20:00 to 13-AUG-07 18:20:00 (CST-6)
Location: BRAINERD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CASS, MINNESOTA
From 13-AUG-07 18:18:00 to 13-AUG-07 18:18:00 (CST-6)
Location: SYLVAN
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

Several twelve to  fourteen inch diameter trees were blown.  Vehicles were damaged from from hail and fallen trees.

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:25:00 to 13-AUG-07 18:25:00 (CST-6)
Location: BAXTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

In addition to the hail, trees blown down by strong thunderstorm winds at County Highway 177 and Highway 49.

Thunderstorm Wind in CASS, MINNESOTA
From 13-AUG-07 17:40:00 to 13-AUG-07 17:40:00 (CST-6)
Location: PILLAGER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Mnay 30-foot tall trees were blown down by the strong thunderstorm winds.

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:28:00 to 13-AUG-07 18:28:00 (CST-6)
Location: BAXTER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:30:00 to 13-AUG-07 18:30:00 (CST-6)
Location: BRAINERD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in PINE, MINNESOTA
From 13-AUG-07 19:54:00 to 13-AUG-07 19:54:00 (CST-6)
Location: PINE CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CASS, MINNESOTA
From 13-AUG-07 17:50:00 to 13-AUG-07 17:50:00 (CST-6)
Location: PILLAGER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was also wind damage with at least ten 18-inch diameter trees blown down.

Hail in CASS, MINNESOTA
From 13-AUG-07 17:50:00 to 13-AUG-07 17:50:00 (CST-6)
Location: LAKE SHR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, MINNESOTA
From 13-AUG-07 18:00:00 to 13-AUG-07 18:00:00 (CST-6)
Location: SYLVAN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CASS, MINNESOTA
From 13-AUG-07 18:09:00 to 13-AUG-07 18:09:00 (CST-6)
Location: SYLVAN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:25:00 to 13-AUG-07 18:25:00 (CST-6)
Location: FT RIPLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail depth up to 3 inches was reported.

Thunderstorm Wind in CROW WING, MINNESOTA
From 13-AUG-07 18:05:00 to 13-AUG-07 18:05:00 (CST-6)
Location: BRAINERD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two large trees were blown down by strong thunderstorm winds.

Thunderstorm Wind in CROW WING, MINNESOTA
From 13-AUG-07 18:21:00 to 13-AUG-07 18:21:00 (CST-6)
Location: BRAINERD
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Hundreds of trees were blown down. SOme homes were damaged by falling trees and limbs.

Hail in CASS, MINNESOTA
From 13-AUG-07 17:58:00 to 13-AUG-07 17:58:00 (CST-6)
Location: LEADER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail covered the ground.

Hail in CROW WING, MINNESOTA
From 13-AUG-07 18:15:00 to 13-AUG-07 18:15:00 (CST-6)
Location: BRAINERD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail covered the ground. A six-inch diameter oak tree was blown down by strong thunderstorm winds.