In association with a stationary front, a large complex of thunderstorms travelled generally along and south of the Interstate 80 corridor during the afternoon and early evening of the 23rd.  The storms moved across eastern Iowa and into northwest Illinois during the afternoon, intensifying as they moved east and became more organized.  By the time the thunderstorm complex approached the Mississippi River, wind gusts reached 70 mph.
Later in the evening, a second round of thunderstorms developed near the same stalled front, this time generally from Highway 30 northward.  These storms produced hail up to the size of quarters, mainly in the Cedar Rapids metro area.

Flood in DELAWARE, IOWA
From 23-JUL-10 16:23:00 to 23-JUL-10 17:30:00 (CST-6)
Location: MANCHESTER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rains on July 22 and 23 caused the Maquoketa River to rise 3 feet in about 2 hours during the late afternoon and evening of July 23.  Some docks and decks were damaged along the river.

Hail in LINN, IOWA
From 23-JUL-10 20:02:00 to 23-JUL-10 20:02:00 (CST-6)
Location: BERTRAM
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LINN, IOWA
From 23-JUL-10 20:15:00 to 23-JUL-10 20:15:00 (CST-6)
Location: MARION
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:55:00 to 23-JUL-10 14:55:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down a tree at Vanderveer Park in Davenport, IA around 355 pm CDT July 23.  The tree blocked some lanes on Brady Street.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:56:00 to 23-JUL-10 14:56:00 (CST-6)
Location: DAVENPORT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 to 70 mph were observed about 1 mile west southwest of Davenport, IA around 356 pm CDT July 23.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:55:00 to 23-JUL-10 14:55:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down a 10 inch diameter tree limb and several smaller branches near 4th Street and Brown Street in Davenport, IA around 355 pm CDT July 23.

Hail in LINN, IOWA
From 23-JUL-10 20:16:00 to 23-JUL-10 20:16:00 (CST-6)
Location: MARION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter-sized hail fell about 1 mile northeast of Marion, IA at 916 pm CDT July 23.

Thunderstorm Wind in LOUISA, IOWA
From 23-JUL-10 14:36:00 to 23-JUL-10 14:36:00 (CST-6)
Location: GRANDVIEW
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down a 3 foot diameter tree in Grandview, IA at 336 pm CDT July 23.  A power outage was also observed in town.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:50:00 to 23-JUL-10 14:50:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts estimated to be 65 mph blew down a 10 inch diameter tree and some 2 to 4 inch branches near Vanderveer Park in Davenport, IA around 350 pm CDT July 23.

Hail in LINN, IOWA
From 23-JUL-10 20:15:00 to 23-JUL-10 20:15:00 (CST-6)
Location: CEDAR RAPIDS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter-sized hail fell in Cedar Rapids, IA at 915 pm CDT July 23.

Thunderstorm Wind in MUSCATINE, IOWA
From 23-JUL-10 14:30:00 to 23-JUL-10 14:30:00 (CST-6)
Location: MUSCATINE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph blew down a large tree limb at the courthouse in Muscatine, IA at 330 pm CDT July 23.

Hail in LINN, IOWA
From 23-JUL-10 20:19:00 to 23-JUL-10 20:19:00 (CST-6)
Location: MARION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter-sized hail fell in Marion, IA at 919 pm CDT July 23.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:54:00 to 23-JUL-10 14:54:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts estimated to be 65 mph blew down part of a large tree just east of the intersection of Marquette Street and 35th Street as well as several tree branches in Junge Park near Fire Station 3 in Davenport, IA around 354 pm CDT July 23.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:54:00 to 23-JUL-10 14:54:00 (CST-6)
Location: DAVENPORT
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Downburst wind gusts estimated to be 70 mph blew down a radio tower and blew of about 10,000 square feet of roof at St. Ambrose University in Davenport, IA around 354 pm CDT July 23.

Thunderstorm Wind in SCOTT, IOWA
From 23-JUL-10 14:54:00 to 23-JUL-10 14:54:00 (CST-6)
Location: DAVENPORT
Magnitude: 56.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph damaged some tents and overturned vendor tables at the Bix Fest in downtown Davenport, IA around 354 pm CDT July 23.