During the late afternoon on April 28th, a stationary boundary lay across southwestern Indiana, across the city of Louisville and extending southeastward to just south of Lexington. A cluster of severe storms developed over southern Illinois during the early afternoon. One storm became predominate, growing into a high precipitation supercell that tracked east southeast along the boundary. After spreading widespread large hail across southern Indiana, this storm tracked right across the Louisville metropolitan area. Large hail fell along a path from Shively, through Churchhill Downs and Louisville International Airport, to the Fern Creek neighborhood and Billtown Road just south of Jeffersontown.  Hail size averaged around 1.5 inches across the metropolitan area, with 2 inch hail reported from just east of Fern Creek. The storm began to weaken as is crossed Spencer and Shelby Counties southeast of Louisville.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 18:52:00 to 28-APR-12 18:52:00 (EST-5)
Location: LOUISVILLE
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported half dollar sized hail in the Portland area.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 18:55:00 to 28-APR-12 18:55:00 (EST-5)
Location: AUDUBON PARK
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter a couple of miles east of the University of Louisville reported hail damage to several car windows. He also estimated 50 mph winds.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 18:56:00 to 28-APR-12 18:56:00 (EST-5)
Location: LOUISVILLE
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: NWS Employee

The National Weather Service Meteorologist in Charge observed 2 inch hail at Churchhill Downs.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:00:00 to 28-APR-12 19:00:00 (EST-5)
Location: INDIAN HILLS
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter reported one inch hail near the Veteran's Administration Hospital east of downtown Louisville.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:02:00 to 28-APR-12 19:02:00 (EST-5)
Location: PLEASURE RIDGE PARK
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Broadcast Media

Louisville media reported golf ball sized hail at Iroquois Park.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:06:00 to 28-APR-12 19:06:00 (EST-5)
Location: (SDF)STANIFORD FLD L
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Official NWS Observations

Golf ball sized hail was reported by the ASOS observer at the Louisville International  Airport.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:07:00 to 28-APR-12 19:07:00 (EST-5)
Location: AUDUBON PARK
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: NWS Employee

A retired NWS employee reported 1.5 inches of hail in the Highlands area of Louisville.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:09:00 to 28-APR-12 19:09:00 (EST-5)
Location: SMYRNA
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:16:00 to 28-APR-12 19:16:00 (EST-5)
Location: FERN CREEK
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous reports of damaging hail were received from the Fern Creek area.  One spotter reported 2 inch hail.  Large hail damaged vehicles and the siding of several homes.  A NWS employee observed many leaves stripped from trees and localized fog resulting from patches of hail left on the ground 2 hours after the storm passed.

Hail in SPENCER, KENTUCKY
From 28-APR-12 19:30:00 to 28-APR-12 19:30:00 (EST-5)
Location: ELK CREEK
Magnitude: 1.25 
Reported by: Trained Spotter

A spotter reported that one half dollar sized hail fell for 8 to 10 minutes.

Hail in JEFFERSON, KENTUCKY
From 28-APR-12 19:21:00 to 28-APR-12 19:21:00 (EST-5)
Location: FERN CREEK
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in SPENCER, KENTUCKY
From 28-APR-12 19:35:00 to 28-APR-12 19:35:00 (EST-5)
Location: TAYLORSVILLE
Magnitude: 1.75 
Reported by: Trained Spotter