A strong disturbance moved through central Iowa during the late afternoon and evening of June 26 brought showers and severe thunderstorms to portions of central and eastern Iowa.  Widespread tree damage occurred across Van Buren County.  One to one and a half inches of rain fell across northeastern Missouri and southeastern Iowa which lead to some flash flooding and flooding.
During the late evening of June 26 and early morning of June 27, another line of severe thunderstorms moved into parts of southeast Iowa, northeast Missouri, and west central Illinois, as a warm front lifted northward into the area.  Winds in excess of 70 mph and torrential rains accompanied the storms.  In addition to widespread tree damage, some buildings collapsed in Keokuk, IA.  Rainfall totals of 1.5 to 3.5 inches fell along and south of a line from Fairfield, IA, to Galesburg, IL which resulted in some flash flooding and flooding.  Some of the higher totals were 3.30 inches 1 mile south of Kahoka, MO, 3.31 inches in Memphis, MO and 3.50 inches 6 miles west northwest of Burlington, IA. Rainfall amounts quickly tapered off to between a trace and a third of an inch across areas to the north.

Thunderstorm Wind in HENDERSON, ILLINOIS
From 27-JUN-11 00:50:00 to 27-JUN-11 00:50:00 (CST-6)
Location: TERRE HAUTE
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 70 mph caused some tree damage in the Terre Haute Cemetery just north of Terre Haute, IL and blew a tree down onto a house in Terre Haute, IL around 150 am CDT June 27.

Hail in HANCOCK, ILLINOIS
From 27-JUN-11 00:38:00 to 27-JUN-11 00:38:00 (CST-6)
Location: WARSAW
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Quarter sized hail fell in Warsaw, IL at 138 am CDT June 27.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:38:00 to 27-JUN-11 00:38:00 (CST-6)
Location: WARSAW
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wind gusts estimated to be 65 mph blew down some tree limbs and power lines in  Warsaw, IL at 138 am CDT June 27.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:44:00 to 27-JUN-11 00:44:00 (CST-6)
Location: CARTHAGE
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 65 mph wind gust was recorded about 1 mile east southeast of Carthage, IL at 144 am CDT June 27.  Some power line flashes were also observed on the east side of Carthage.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:45:00 to 27-JUN-11 00:45:00 (CST-6)
Location: CARTHAGE
Magnitude: 65.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gust estimated to be 75 mph blew down some buildings between Carthage, IL and Bentley, IL around 145 am CDT June 27.  This report was relayed by a COOP Observer.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 26-JUN-11 22:00:00 to 26-JUN-11 22:00:00 (CST-6)
Location: ROCK IS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 60 mph blew down a large tree limb on the 3200 block of 14th Avenue in Rock Island, IL around 11 pm CDT June 26.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:30:00 to 27-JUN-11 00:30:00 (CST-6)
Location: HAMILTON
Magnitude: 61.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Newspaper

Wind gusts estimated to be 60 to 80 mph downed several trees and large limbs across much of Hamilton, IL around 130 am CDT June 27.  A home on North 19th Street sustained roof damage and a power pole was blown down in the front yard.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:45:00 to 27-JUN-11 00:45:00 (CST-6)
Location: BENTLEY
Magnitude: 61.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts in excess of 70 mph blew down several trees and large limbs in Bentley, IL around 145 am CDT June 27.  Some roads were blocked by the tree debris.  In addition, some buildings and homes were damaged and a new Morton building on the north side of Bentley was strewn across the freeway.  Some of the trees and limbs fell onto a few homes.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:45:00 to 27-JUN-11 00:45:00 (CST-6)
Location: CARTHAGE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Wind gusts estimated to be 70 mph blew down several trees and limbs in Carthage, IL around 145 am CDT June 27.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:46:00 to 27-JUN-11 00:46:00 (CST-6)
Location: BOWEN
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 in Bowen, IL around 146 am CDT June 27.  A power outage was also observed in Bowen and Augusta.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:46:00 to 27-JUN-11 00:46:00 (CST-6)
Location: PLYMOUTH
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph blew down several trees and some power lines in Plymouth, IL around 146 am CDT June 27.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 27-JUN-11 01:15:00 to 27-JUN-11 01:15:00 (CST-6)
Location: COLCHESTER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph uprooted a 20 inch diameter, 18 foot tall tree in Colchester, IL around 215 am CDT June 27.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 27-JUN-11 01:20:00 to 27-JUN-11 01:20:00 (CST-6)
Location: COLCHESTER
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts estimated to be 70 mph snapped an 18 inch diameter tree off at the base in Colchester, IL around 220 am CDT June 27.  Some power lines were also downed resulting in a power outage in Colchester.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 27-JUN-11 01:30:00 to 27-JUN-11 01:30:00 (CST-6)
Location: MACOMB
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 several Fir trees in Macomb, IL around 230 am CDT June 27.

Flash Flood in MCDONOUGH, ILLINOIS
From 26-JUN-11 21:42:00 to 27-JUN-11 04:00:00 (CST-6)
Location: ARGYLE LAKE SP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rains caused some flash flooding about 2 miles south southeast of Macomb, IL during the late evening of June 26 and morning of June 27.  The flood waters covered the roadway at Jackson Street.

Thunderstorm Wind in WARREN, ILLINOIS
From 26-JUN-11 21:42:00 to 26-JUN-11 21:42:00 (CST-6)
Location: CAMERON
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 tree branches and snapped some corn stalks near Cameron, IL at 1042 pm CDT June 26.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 27-JUN-11 00:50:00 to 27-JUN-11 00:50:00 (CST-6)
Location: LA HARPE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Winds estimated to be 70 mph blew down some trees in some parks in La Harpe, IL around 150 am CDT June 27.