A warm front stretching from southwest Kansas to northern Ohio pushed humid air into eastern Iowa, northeast Missouri, and northwest Illinois during the early morning hours of May 29. Widespread dense fog developed from eastern Iowa to central Wisconsin with visibilities less than a quarter of a mile in many locations. By mid morning, showers and thunderstorms developed as the warm front lifted into the region. Heavy rains of over an inch fell at Parnell, Keosauqua, Annawan, Morrison, Erie and the Davenport Municipal Airport. In addition to the heavy rain, some storms produced large hail and damaging winds.

Thunderstorm Wind in HENRY, ILLINOIS
From 29-MAY-11 09:50:00 to 29-MAY-11 09:50:00 (CST-6)
Location: CAMBRIDGE
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 65 mph snapped a power pole in half just south of Cambridge, IL around 1050 am CDT May 29.

Hail in HENDERSON, ILLINOIS
From 29-MAY-11 09:55:00 to 29-MAY-11 09:55:00 (CST-6)
Location: LOMAX
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter sized hail fell in Dallas City, IL at 1055 am CDT May 29.

Flash Flood in HENRY, ILLINOIS
From 29-MAY-11 09:45:00 to 29-MAY-11 10:45:00 (CST-6)
Location: ALPHA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rains resulted in some flash flooding in the Alpha, IL area during the late morning and early afternoon of May 29.  The flood waters were flowing over Oxford Road near Alpha.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 29-MAY-11 10:13:00 to 29-MAY-11 10:13:00 (CST-6)
Location: ERIE
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 in Erie, IL at 1113 am CDT May 29.

Thunderstorm Wind in BUREAU, ILLINOIS
From 29-MAY-11 10:18:00 to 29-MAY-11 10:18:00 (CST-6)
Location: YORKTOWN
Magnitude: 61.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph flattened a pole barn, damaged some grain bins, blew a tree down, and moved an irrigator at a farm just north of Yorktown, IL at 1118 am CDT May 29.

Thunderstorm Wind in PUTNAM, ILLINOIS
From 29-MAY-11 10:40:00 to 29-MAY-11 10:40:00 (CST-6)
Location: GRANVILLE
Magnitude: 65.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 75 mph blew down some trees and power lines in Granville, IL at 1140 am CDT May 29.

Thunderstorm Wind in PUTNAM, ILLINOIS
From 29-MAY-11 10:40:00 to 29-MAY-11 10:40:00 (CST-6)
Location: GRANVILLE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 75 mph were observed in Granville, IL at 1140 am CDT May 29.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 29-MAY-11 09:40:00 to 29-MAY-11 09:40:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A 60 mph wind gust was measured by the ASOS at the Quad City Airport in Moline, IL at 1040 am CDT May 29.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 29-MAY-11 09:40:00 to 29-MAY-11 09:40:00 (CST-6)
Location: MILAN
Magnitude: 52.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph blew a trampoline across a street into a neighbor's house about 3 miles south southwest of Rock Island, IL at 1040 am CDT May 29.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 29-MAY-11 09:40:00 to 29-MAY-11 09:40:00 (CST-6)
Location: ROCK IS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 60 mph blew a large tree down across 18th Ave in Rock Island, IL around 1040 am CDT May 29.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 29-MAY-11 09:45:00 to 29-MAY-11 09:45:00 (CST-6)
Location: BLACKHAWK STATE PARK
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 several large tree branches in Rock Island, IL at 1045 am CDT May 29.