Two rounds of showers and thunderstorms moved across parts of eastern Iowa and northwest Illinois during the morning of July 24.
The first was a cluster of thunderstorms that developed along Interstate 80 and moved eastward into Illinois between 3 am CDT and 8 am CDT, while merging with another cluster of storms diving southeastward out of southwest Wisconsin.  Some of the stronger storms produced damaging winds of 60 to 70 mph.
Towards the late morning hours, a secondary cluster of thunderstorms developed near Waterloo, IA and raced southeastward producing wind damage across parts of Linn and Cedar counties.

Thunderstorm Wind in BENTON, IOWA
From 24-JUL-11 02:30:00 to 24-JUL-11 02:30:00 (CST-6)
Location: WATKINS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 60 mph blew down some tree limbs in Watkins, IA at 330 am CDT July 24.  This report was relayed by a media partner.

Thunderstorm Wind in SCOTT, IOWA
From 24-JUL-11 03:30:00 to 24-JUL-11 03:30:00 (CST-6)
Location: ELDRIDGE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts estimated to be 65 mph blew down several tree limbs and branches around 8th Street in Eldridge, IA at 430 am CDT July 24.

Thunderstorm Wind in JOHNSON, IOWA
From 24-JUL-11 06:00:00 to 24-JUL-11 06:00:00 (CST-6)
Location: SHARON CENTER
Magnitude: 70.00 EG
Property damage: 50.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph damaged a grain elevator, partially ripped off a garage roof, snapped some large tree limbs, and flattened some corn about 4 miles northeast of Frytown, IA which is also known as Williamstown, IA around 700 am CDT July 24.

Thunderstorm Wind in LINN, IOWA
From 24-JUL-11 09:55:00 to 24-JUL-11 09:55:00 (CST-6)
Location: HIAWATHA
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed 5 miles north northeast of Cedar Rapids, IA at 1055 am CDT July 24.

Thunderstorm Wind in LINN, IOWA
From 24-JUL-11 10:02:00 to 24-JUL-11 10:02:00 (CST-6)
Location: HIAWATHA
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph blew down some tree branches about 5 miles north of Cedar Rapids, IA at 1102 am CDT July 24.

Thunderstorm Wind in LINN, IOWA
From 24-JUL-11 10:21:00 to 24-JUL-11 10:21:00 (CST-6)
Location: MT VERNON
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph caused a power outage in Mount Vernon, IA at 1121 am CDT July 24.

Thunderstorm Wind in CEDAR, IOWA
From 24-JUL-11 10:28:00 to 24-JUL-11 10:28:00 (CST-6)
Location: CLARENCE
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 60 mph blew down some tree limbs onto some power lines in Clarence, IA at 1128 am CDT July 24.

Thunderstorm Wind in SCOTT, IOWA
From 24-JUL-11 03:28:00 to 24-JUL-11 03:28:00 (CST-6)
Location: DAVENPORT ARPT
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

A 66 mph wind gust was recorded by the ASOS at the Davenport Municipal Airport at 428 am CDT July 24.

Thunderstorm Wind in SCOTT, IOWA
From 24-JUL-11 03:30:00 to 24-JUL-11 03:30:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 65 mph ripped part of the roof off of Sieffert Lumber Company on the northwest side of Davenport, IA around 430 am CDT July 24.  In addition, a metal shed was lifted into the air and tossed onto a car and then over a house and onto another shed at the Arp residence across the street.