The initial storms formed in a hot and very unstable air mass, producing an isolated microburst near Owensboro. Later in the evening, a large cluster of thunderstorms drifted southeast from southern Illinois and then accelerated southeast across western Kentucky. Strong outflow winds ahead of the storms produced isolated damage. After the initial storms stabilized the atmosphere, the trailing storms posed more of a heavy rain and flooding threat. The storms occurred along and ahead of a cold front that was draped across southern Illinois and southern Missouri.

Heavy Rain in LYON, KENTUCKY
From 12-JUL-11 20:45:00 to 12-JUL-11 21:35:00 (CST-6)
Location: EDDYVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 1.5 inches of rain and still falling heavily.

Heavy Rain in MARSHALL, KENTUCKY
From 12-JUL-11 20:45:00 to 12-JUL-11 21:20:00 (CST-6)
Location: CALVERT CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rainfall during the 35-minute period was 1.1 inches.

Heavy Rain in DAVIESS, KENTUCKY
From 12-JUL-11 12:40:00 to 12-JUL-11 13:30:00 (CST-6)
Location: WHITESVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Ditches were overflowing, and water was over the road in a number of places.

Thunderstorm Wind in MCCRACKEN, KENTUCKY
From 12-JUL-11 20:40:00 to 12-JUL-11 20:40:00 (CST-6)
Location: LONE OAK
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 2.00K
Reported by: Emergency Manager

A billboard was destroyed on the south side of Paducah. Numerous tree limbs were blown down, some up to three inches in diameter. About one-half to one acre of corn was flattened just west of Paducah.

Flash Flood in MCCRACKEN, KENTUCKY
From 12-JUL-11 20:40:00 to 12-JUL-11 21:55:00 (CST-6)
Location: PADUCAH
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An intersection on U.S. Highway 62 was shut down because of flooding that was estimated to be almost two feet deep. Considerable street flooding was reported on roadways across Paducah, including the railroad underpass on U.S. Highway 62. Some cars were stranded. A television station in Paducah measured 2.40 inches of rain.

Thunderstorm Wind in CARLISLE, KENTUCKY
From 12-JUL-11 20:40:00 to 12-JUL-11 20:40:00 (CST-6)
Location: BARDWELL
Magnitude: 61.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One half of a roof was blown off a business along U.S. Highway 51. The other half of the roof was severely damaged. Power lines and some trees were down on U.S. Highway 51. The wind damage was caused by outflow winds that progressed well ahead of the actual thunderstorms.

Thunderstorm Wind in LYON, KENTUCKY
From 12-JUL-11 20:53:00 to 12-JUL-11 20:53:00 (CST-6)
Location: EUREKA
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A 50-foot houseboat was blown aground. Two other boats were reported to be grounded.

Thunderstorm Wind in DAVIESS, KENTUCKY
From 12-JUL-11 12:45:00 to 12-JUL-11 12:45:00 (CST-6)
Location: WHITESVILLE
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 4.00K
Reported by: Emergency Manager

A roof was blown off a barn. One carport was destroyed, with debris spread over about 100 yards. One power line was down. Several barns and outbuildings sustained  some roof damage. Two corn fields with corn about four feet high were blown down to the southeast. A large number of limbs up to two inches in diameter were blown down. All the damage occurred within a radius of about two miles.