A deepening upper-level low was progressing slowly southeastward from the northern plains into the Ohio Valley region.  By September 24th, this system had become a deep cutoff low which meandered about the Ohio Valley and Mid-Atlantic region for over a week.  On September 22nd as the upper low was progressing slowly southeast and deepening, a leading short wave and associated cold front progressing into the southeast U.S. encountered an unseasonably warm, moist, almost tropical air mass. Precipitable water values were well above average, running in the 1.8 to 2.1 range across the region as the upper low approached the region.  Scattered to numerous showers and thunderstorms persisted across parts of east central and central Georgia during the early to mid-morning hours.  After a lull in activity during midday, afternoon heating helped initiate redevelopment across north and west central Georgia.  Given the high water content of the air mass and slow movement of the individual thunderstorm cells, excessive rainfall was observed from the stronger cells.  There were two incidents of flash flooding in the Atlanta metropolitan area.  In addition, the storms were efficient cloud-to-ground lightning producers, with at least one lightning-related fire reported from this event.

Flash Flood in FAYETTE, GEORGIA
From 22-SEP-11 16:15:00 to 22-SEP-11 18:45:00 (EST-5)
Location: ABERDEEN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Fayette County Emergency Management Director reported flash flooding in the Tinsley Mill Village area of Peachtree City.  The flood was the result of Cherry Branch coming out of its banks as over two inches of rain fell in less than two hours in a flash flood prone area.  The waters from Cherry Branch surrounded two condominums, but did not enter the properties.  No evacuations were required.  Elsewhere in Peachtree City, a detention pond on Crosstown Road flooded the basement of a home on Prestwick Lane with two to three feet of water and a pond at Luther Glass Park along South Peachtree Parkway overflowed and flooded portions of the adjacent golf cart path with approximately two feet of water.  Monetary damage to the flooded basement and debris cleanup along roads, golf cart paths, and property was estimated to be approximately $10,000.

Flash Flood in FORSYTH, GEORGIA
From 22-SEP-11 18:40:00 to 22-SEP-11 21:30:00 (EST-5)
Location: HIGHTOWER
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Forsyth County Emergency Management Director reported flash flooding near Georgia Highway 369 in the Heardsville area in the northwest part of the county.  Debris was observed on the roadway.  KFFC WSR-88D estimated that four to five inches of rain fell across the northwest part of Forsyth county.  Monetary damage was confined to debris removal.

Lightning in COWETA, GEORGIA
From 22-SEP-11 13:57:00 to 22-SEP-11 13:57:00 (EST-5)
Location: THOMAS XRDS
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Coweta County Emergency Management Director reported that a home in Thomas Crossroads on Sandra Lane in the Legacy Estates Subdivision just south of Georgia Highway 34 was struck by lightning and set on fire.  The attic of the home suffered considerable fire damage before the fire was brought under control.  The home was rendered uninhabitable as a result of the fire.

Lightning in COWETA, GEORGIA
From 22-SEP-11 14:04:00 to 22-SEP-11 14:04:00 (EST-5)
Location: THOMAS XRDS
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Coweta County Emergency Management Director reported that a second home was struck by lightning.  This home was located at 220 Spring Forest Way, again in the Thomas Crossroads area.  No fire occurred and only minor electrical damage was observed.

Lightning in COWETA, GEORGIA
From 22-SEP-11 17:00:00 to 22-SEP-11 17:00:00 (EST-5)
Location: WELCOME
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Coweta County Emergency Management Director reported that lightning struck yet a third home, this time in western Coweta county.  The home suffered extensive fire and smoke damage as a result of the lightning strike, rendering the home uninhabitable.

Thunderstorm Wind in FORSYTH, GEORGIA
From 22-SEP-11 17:50:00 to 22-SEP-11 17:57:00 (EST-5)
Location: MATT
Magnitude: 52.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Forsyth County Emergency Management reported that at least six trees were down in the far northern part of the county near Silver City.  One tree was down on a home causing damage to the structure.  At least two power lines were also down.  Three of the trees and one of the power lines were snapped in half.  There was suspicion that the event may have been caused by a weak EF0 tornado.  However, this was not confirmed.  WSR-88D base velocity data indicated at least weak rotation in the area at the time.

Hail in FORSYTH, GEORGIA
From 22-SEP-11 18:30:00 to 22-SEP-11 18:40:00 (EST-5)
Location: SILVER CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Forsyth County Emergency Management Director relayed reports of pea to penny-sized hail near Jot-Em-Down Road and Georgia Highway 400.