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 crossed the Mississippi River, wind gusts approached 70 mph.  Extensive damage was reported across portions of Henry, Bureau, and Putnam Counties in Illinois from these storms.

Thunderstorm Wind in BUREAU, ILLINOIS
From 23-JUL-10 15:42:00 to 23-JUL-10 15:42:00 (CST-6)
Location: TISKILWA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed just west of Tiskilwa, IL at 442 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 15:25:00 to 23-JUL-10 15:25:00 (CST-6)
Location: ANNAWAN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph were observed about 3 miles southeast of Annawan, IL around 425 pm CDT July 23.

Thunderstorm Wind in BUREAU, ILLINOIS
From 23-JUL-10 16:01:00 to 23-JUL-10 16:01:00 (CST-6)
Location: LA MOILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 to 70 mph were observed about 1 mile south of La Moille, IL at 501 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 16:14:00 to 23-JUL-10 16:14:00 (CST-6)
Location: ANNAWAN
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph blew down some power lines in Annawan, IL at 514 pm CDT July 23.  A power outage was observed throughout the town.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 23-JUL-10 14:35:00 to 23-JUL-10 14:35:00 (CST-6)
Location: ILLINOIS CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 50 to 60 mph were observed about 4 miles southeast of Muscatine, IA or about 6.5 miles west southwest of Illinois City, IL at 335 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 15:05:00 to 23-JUL-10 15:05:00 (CST-6)
Location: ORION
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph ripped some shingles off of a residence about 2 miles southwest of Orion, IL around 405 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 15:15:00 to 23-JUL-10 15:15:00 (CST-6)
Location: CAMBRIDGE
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 some large tree limbs in Cambridge, IL around 415 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 15:16:00 to 23-JUL-10 15:16:00 (CST-6)
Location: COLONA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph were observed in Colona, IL at 416 pm CDT July 23.

Thunderstorm Wind in HENRY, ILLINOIS
From 23-JUL-10 15:18:00 to 23-JUL-10 15:18:00 (CST-6)
Location: GENESEO
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 65 to 70 mph blew down numerous large trees and branches in Geneseo, IL around 418 pm CDT July 23.

Thunderstorm Wind in BUREAU, ILLINOIS
From 23-JUL-10 15:45:00 to 23-JUL-10 15:45:00 (CST-6)
Location: WYANET
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 to 65 mph were observed about 1 mile south of Wyanet, IL at 445 pm CDT July 23.

Thunderstorm Wind in BUREAU, ILLINOIS
From 23-JUL-10 15:50:00 to 23-JUL-10 15:55:00 (CST-6)
Location: PRINCETON
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts estimated to be 65 to 70 mph downed power lines, uprooted trees, and destroying fences.  East Thompson Street and Euclid Avenue were particularly hard-hit with numerous trees, branches, and power lines down.  A riding lawn mower was overturned, and the local newspaper reported that a boat was lodged in a tree.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 23-JUL-10 14:57:00 to 23-JUL-10 14:57:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A wind gust measured to be 59 mph was observed by the ASOS at the Quad City Airport in Moline, IL at 357 pm CDT July 23.