A well defined and progressive nearly cutoff low was positioned over east central Indiana during the afternoon of August 21st.  South and east of this feature, a seasonally strong cyclonic 300mb jet was present, placing central and eastern Kentucky within an area of diffluence aloft.  Strong instability up to 2000 joules developed by mid-afternoon along and east of Interstate 65.  Scattered thunderstorms developed by late morning and strengthen during the afternoon hours.  Training storms produced, within a 2 hour period, a strip of 4 to as much as 5 inches of rain across northern Lincoln and Garrard Counties.  Within this line of storms, lightning struck a barn, killing two people and injuring three others. This has become Kentucky's worst lightning related incident in several years.  Later, a strong storm that briefly displayed supercell characteristics developed over Shelby County.  This storm produced golfball-sized hail and damaging winds.

Hail in SHELBY, KENTUCKY
From 21-AUG-13 17:15:00 to 21-AUG-13 17:15:00 (EST-5)
Location: L S PARK
Magnitude: 1.50 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail up to 1.5 inches in diameter was reported along Clark Station Road between Fisherville and Eastwood.

Hail in SHELBY, KENTUCKY
From 21-AUG-13 17:10:00 to 21-AUG-13 17:10:00 (EST-5)
Location: SIMPSONVILLE
Magnitude: 1.75 
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Local media reported golf-ball sized hail that fell from a supercell in Simpsonville.

Thunderstorm Wind in SHELBY, KENTUCKY
From 21-AUG-13 17:10:00 to 21-AUG-13 17:10:00 (EST-5)
Location: SIMPSONVILLE
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The local emergency manager reported that a large tree fell on a house in Simpsonville.

Thunderstorm Wind in MADISON, KENTUCKY
From 21-AUG-13 14:40:00 to 21-AUG-13 14:40:00 (EST-5)
Location: MIDDLETOWN
Magnitude: 52.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Local media reported several trees and power lines down near Berea.

Thunderstorm Wind in MADISON, KENTUCKY
From 21-AUG-13 14:40:00 to 21-AUG-13 14:40:00 (EST-5)
Location: RICHMOND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A thunderstorm toppled a tree in Richmond.

Thunderstorm Wind in FRANKLIN, KENTUCKY
From 21-AUG-13 16:15:00 to 21-AUG-13 16:15:00 (EST-5)
Location: PEAKS MILL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported two trees down along Peaks Mill Road.

Flash Flood in GARRARD, KENTUCKY
From 21-AUG-13 14:51:00 to 21-AUG-13 14:51:00 (EST-5)
Location: LANCASTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Lancaster Fire Dept. reported that Crab Orchard Road was briefly closed due to flash flooding. Buckeye Road was also partially impeded by high water.

Flash Flood in GARRARD, KENTUCKY
From 21-AUG-13 15:00:00 to 21-AUG-13 15:00:00 (EST-5)
Location: LANCASTER
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Five hundred feet of Highway 1150 was washed away by flash flooding between mile markers 0 and 1.

Flash Flood in LINCOLN, KENTUCKY
From 21-AUG-13 15:00:00 to 21-AUG-13 15:00:00 (EST-5)
Location: GILBERT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Gilbert's Creek Road was closed when Turkey Creek overflowed a bridge.

Heavy Rain in LINCOLN, KENTUCKY
From 21-AUG-13 14:45:00 to 21-AUG-13 14:45:00 (EST-5)
Location: HUBBLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Kentucky mesonet site 4 miles north of Stanford measured 2.82 inches of rain in one hour and 10 minutes. This site lies just south of the axis of the heaviest rainfall, where a radar estimated 4 to 5 inches fell with 2 hours.

Lightning in MADISON, KENTUCKY
From 21-AUG-13 12:30:00 to 21-AUG-13 12:30:00 (EST-5)
Location: COTTONBURG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Lightning struck a tobacco barn near Buckeye, killing two men and injuring 3 others. The men were hanging tobacco at the time.