Thunderstorms moved into areas west of a line from Sigourney, IA to Dubuque, IA during the early evening hours of September 18th ahead of a cold front.  Moderate instability developed and humidity levels increased during the afternoon as temperatures rose into the middle 80s to near 90.
A small bowing echo line of storms moved through areas north and west of the Cedar Rapids area producing damaging winds between 60 and 80 mph.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:41:00 to 18-SEP-07 17:41:00 (CST-6)
Location: KEYSTONE
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Winds estimated to be 70 mph blew a 55,000 bushel grain bin over and a fertilizer storage bin 30 feet.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:24:00 to 18-SEP-07 17:24:00 (CST-6)
Location: GARRISON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds were estimated to be 65 mph about 7 miles southwest of Vinton, IA.  Relayed by EM.  Reported by a trained spotter.

Thunderstorm Wind in BUCHANAN, IOWA
From 18-SEP-07 17:42:00 to 18-SEP-07 17:42:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds were estimated to be 60 mph at the intersection of Highway 20 and Highway 150 at the Walmart Store in Independence, IA.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:43:00 to 18-SEP-07 17:43:00 (CST-6)
Location: VINTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winds estimated to be 65 mph blew down a large healthy oak tree near the intersection of 63rd Street and 28th Street in Vinton, IA.

Thunderstorm Wind in LINN, IOWA
From 18-SEP-07 17:50:00 to 18-SEP-07 17:50:00 (CST-6)
Location: TROY MILLS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winds were estimated to be 65 mph near Troy Mills, IA.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:13:00 to 18-SEP-07 17:13:00 (CST-6)
Location: BELLE PLAINE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A wind gust was measured at 60 mph.  Reported by the EMA office.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:21:00 to 18-SEP-07 17:21:00 (CST-6)
Location: VAN HORNE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds were estimated to be 60 mph by the fire department at Van Horne, IA.

Thunderstorm Wind in BENTON, IOWA
From 18-SEP-07 17:24:00 to 18-SEP-07 17:24:00 (CST-6)
Location: VINTON
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust of 79 mph was measured at Vinton, IA.  Sustained winds were 46 mph.

Thunderstorm Wind in DELAWARE, IOWA
From 18-SEP-07 18:18:00 to 18-SEP-07 18:18:00 (CST-6)
Location: MANCHESTER
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds estimated to be 65 mph blew down some trees in Manchester, IA.

Thunderstorm Wind in DELAWARE, IOWA
From 18-SEP-07 18:18:00 to 18-SEP-07 18:18:00 (CST-6)
Location: DUNDEE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds estimated to be 65 mph blew down some trees in Dundee, IA.

Thunderstorm Wind in DELAWARE, IOWA
From 18-SEP-07 18:18:00 to 18-SEP-07 18:18:00 (CST-6)
Location: EDGEWOOD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Winds estimated to be 65 mph blew down some trees and destroyed a 50 foot by 80 foot shop building in Edgewood, IA.

Thunderstorm Wind in DELAWARE, IOWA
From 18-SEP-07 18:03:00 to 18-SEP-07 18:03:00 (CST-6)
Location: EDGEWOOD
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust was measured at 62 mph in Edgewood, IA.