A significant Arctic air mass, which had spread across the southeast U.S. beginning on the 12th, was retreating slowly northeast.  By mid-afternoon on the 15th, mid-level warm advection, combined with a weak disturbance aloft, resulted in the development of light precipitation across north and central Georgia.  Much of north Georgia, north of Interstate-20, remained just below freezing as the precipitation spread into the area from the west during the mid-afternoon.  Ground surfaces were at or below freezing as the result of the previous three days of all-day below freezing temperatures and early morning temperatures in the 10-15F range.  In addition, surface dewpoints at the onset of the precipitation event were near 0F across north Georgia, resulting in a significant wetbulb effect.  Surface temperatures dropped quickly at the onset of the precipitation from the mid 30s into the upper 20s.  Thus, although liquid equivalent precipitation averaged only 0.01 inch across most of the affected area, it froze immediately on contact with the surface.  An initial burst of sleet quickly changed over to light freezing rain and eventually freezing drizzle through the evening hours as the boundary layer air mass had undergone significant warming and was well above freezing.  Roads, including major interstates from Atlanta west to Alabama and north to Tennessee, quickly and literally became like ice skating rinks as a thin sheet of black ice (<0.1 inch) formed on the roads and highways.  To make matters worse, this occurred during the 5 pm to 7 pm evening rush hour.  Major highways and interstates north and west of Atlanta, such as Interstate-20 and Interstate-75, became completely clogged with accidents.  Thousands of motorists became stranded in multiple car pileups and backups.  In some cases, a quick trip became several hours long.  Over 3000 accidents occurred across north Georgia during this evening, with at least 1000 of these occurring just in the Atlanta metropolitan counties alone.  While no fatalities were reported, several injuries occurred.  Some details are provided below.
Banks county - less than 0.1 inch of glaze ice;
Barrow county - less than 0.1 inch of glaze ice;
Bartow county - up to 0.1 inch of glaze ice.  More than 20 accidents across the county, many on I-75;
Carroll county - up to 0.1 inch of glaze ice across mainly the northern part of the county.  The majority of the problems were in the Villa Rica and Carrollton areas.  More than 100 accidents across the county.  One person injured in an accident on South Carroll Road;
Catoosa county - up to 0.1 inch of glaze ice;
Chattooga county - up to 0.1 inch of glaze ice;
Cherokee county - 0.1 to 0.25 inch of glaze ice.  At least 223 traffic accidents reported across the county;
Cobb county - 0.1 inch of glaze ice across most of the county, with up to 0.25 inch of glaze ice in the far northeast part of the county;
Dade county - less than 0.1 inch of glaze ice;
Dawson county - generally 0.1 inch of glaze ice across much of the county;
DeKalb county - up to 0.1 inch of glaze ice across the northern part of the county.  Little or no ice in the southern part;
Fannin county - less than 0.1 inch of glaze ice;
Floyd county - up to 0.1 inch of glaze ice.  At least 115 car accidents reported across the county;
Forsyth county - 0.25 inch of glaze ice across much of the county.  At least 64 traffic accidents across the county;
Fulton county - up to 0.25 inch of glaze ice across far north Fulton county, up to 0.1 inch of glaze ice north of the Atlanta airport toward Midtown, with little or no ice south of the Atlanta airport in the southern part of the county;
Gilmer county - up to 0.1 inch of glaze ice;
Gordon county - up to 0.1 inch of glaze ice;
Gwinnett county - 0.1 to 0.25 inch of glaze ice across the north part of the county.  Several major accidents.  One accident on Old Fountain Road resulted in life-threatening injuries.  A major 15-car pileup occurred on Peachtree Industrial Boulevard;
Hall county - up to 0.1 inch of glaze ice;
Haralson county - generally 0.1 inch of glaze ice across the county;
Jackson county - less than 0.1 inch of glaze ice;
Lumpkin county - less than 0.1 inch of glaze ice;
Murray county - up to 0.1 inch of glaze ice;
Paulding county - 0.1 inch of glaze ice across much of the county.  Hundreds of accidents reported across the county;
Polk county - up to 0.1 inch of glaze ice.  Numerous accidents across the county.  One person injured in an accident on U.S. 27 North near Cedartown;
Towns county - less than 0.1 inch of glaze ice;
Union county - less than 0.1 inch of glaze ice;
Walker county - up to 0.1 inch of glaze ice;
White county - less than 0.1 inch of glaze ice;
Whitfield county - up to 0.1 inch of glaze ice.  Four tractor-trailer rigs were jack-knifed on Interstate-75 near Rocky Face.

Winter Weather in DADE, GEORGIA
From 15-DEC-10 18:15:00 to 16-DEC-10 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Dade County Emergency Manager reported less than 0.1 inch of glaze ice across the county.  A few accidents were observed on Interstate-59.

Winter Weather in BANKS, GEORGIA
From 15-DEC-10 20:30:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Banks County Emergency Management Director reported less than 0.1 inch of glaze ice across the county.

Winter Weather in BARROW, GEORGIA
From 15-DEC-10 18:30:00 to 16-DEC-10 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Barrow County 911 Center reported less than 0.1 inch of glaze ice across the county.

Winter Weather in CARROLL, GEORGIA
From 15-DEC-10 16:30:00 to 16-DEC-10 02:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Carroll County Emergency Management Director reported up to 0.1 inch of glaze ice across mainly the northern part of the county.  More than 100 traffic accidents were reported in the Villa Rica and Carrollton areas.  One person was injured in a traffic accident on South Carroll Road.

Winter Weather in BARTOW, GEORGIA
From 15-DEC-10 16:15:00 to 16-DEC-10 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Bartow County Emergency Management Director reported up to 0.1 inch of glaze ice across the county.  At least 20 traffic accidents were observed, several on Interstate-75.

Winter Weather in CATOOSA, GEORGIA
From 15-DEC-10 18:30:00 to 16-DEC-10 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Catoosa County 911 Center reported that up to 0.1 inch of glaze ice was observed across the county.

Winter Weather in GILMER, GEORGIA
From 15-DEC-10 18:40:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Gilmer County Emergency Management Director reported up to 0.1 inch of glaze ice across the county.  More than 100 accidents were observed across the county.

Winter Weather in NORTH FULTON, GEORGIA
From 15-DEC-10 17:00:00 to 16-DEC-10 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Fulton County 911 Center reported up to 0.25 inch of glaze ice across the northern part of the county and about 0.1 inch of glaze ice across the central part of the county from just north of the Atlanta airport toward downtown Atlanta.  Little or no ice accumulation was observed south of the Atlanta airport.  Numerous traffic accidents were observed on the interstates in the north part of the county, including Interstates 20, 75, 80, and 285.

Winter Weather in GORDON, GEORGIA
From 15-DEC-10 17:15:00 to 16-DEC-10 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Gordon County Emergency Management Director reported up to 0.1 inch of glaze ice across the county.  Numerous accidents were observed throughout the county.  Major pileups and backups were observed on Interstate-75.

Winter Weather in GWINNETT, GEORGIA
From 15-DEC-10 19:00:00 to 16-DEC-10 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Gwinnett County 911 Center reported from 0.1 inch of glaze ice across the southern part of the county to 0.25 inch of glaze ice across the northern part of the county.  Several major accidents were observed.  One accident on Old Fountain Road resulted in at least two life-threatening injuries.  A major 15-car pileup was also observed on Peachtree Industrial Boulevard.

Winter Weather in HALL, GEORGIA
From 15-DEC-10 20:00:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Hall County Emergency Management Director reported up to 0.1 inch of glaze ice across much of the county.

Winter Weather in HARALSON, GEORGIA
From 15-DEC-10 16:00:00 to 16-DEC-10 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Haralson County 911 Center reported up to 0.1 inch of glaze ice across the county.

Winter Weather in JACKSON, GEORGIA
From 15-DEC-10 20:30:00 to 16-DEC-10 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Jackson County 911 Center reported up to 0.1 inch of glaze ice, mainly across the northern part of the county.

Winter Weather in LUMPKIN, GEORGIA
From 15-DEC-10 20:30:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Lumpkin County 911 Center reported up to 0.1 inch of glaze ice.

Winter Weather in MURRAY, GEORGIA
From 15-DEC-10 18:30:00 to 16-DEC-10 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Murray County 911 Center reported up to 0.1 inch of glaze ice across the county.

Winter Weather in CHATTOOGA, GEORGIA
From 15-DEC-10 18:25:00 to 16-DEC-10 06:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Chattooga County Emergency Management Director reported up to 0.1 inch of glaze ice across the county.  Several accidents were reported.  Georgia Highway 27 was closed in the higher elevations between Summerville and the Floyd county line.

Winter Weather in CHEROKEE, GEORGIA
From 15-DEC-10 16:30:00 to 16-DEC-10 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Cherokee County Emergency Management Director reported from 0.1 to 0.25 inch of glaze ice across the county.  At least 223 traffic accidents were observed, many causing major pileups and backups on Interstate-75 and Interstate-575.

Winter Weather in COBB, GEORGIA
From 15-DEC-10 17:15:00 to 16-DEC-10 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Cobb County 911 Center reported up to 0.1 inch of glaze ice across the county, with up to 0.25 inch of glaze ice in the northeast part of the county.  Backups and pileups were observed on Interstate-75 as a result of several traffic accidents.

Winter Weather in DAWSON, GEORGIA
From 15-DEC-10 19:25:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Dawson County Emergency Management Director reported up to 0.1 inch of glaze ice across much of the county.  Numerous accidents observed across the county.  All roads completely iced up by late evening.

Winter Weather in DE KALB, GEORGIA
From 15-DEC-10 18:00:00 to 16-DEC-10 01:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Dade County 911 Center reported up to 0.1 inch of glaze ice across the northern part of the county, with little or no ice accumulation in the southern part of the county.

Winter Weather in FANNIN, GEORGIA
From 15-DEC-10 19:30:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Fannin County 911 Center reported up to 0.1 inch of glaze ice accumulation across the county.

Winter Weather in FLOYD, GEORGIA
From 15-DEC-10 18:25:00 to 16-DEC-10 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Floyd County Emergency Management Director reported up to 0.1 inch of glaze across the county.  At least 115 traffic accidents were observed throughout the county.

Winter Weather in FORSYTH, GEORGIA
From 15-DEC-10 18:00:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The Forsyth County Emergency Management Director reported that much of the county received 0.25 inch of glaze ice across the county.  At least 64 traffic accidents were observed throughout the county.

Winter Weather in PAULDING, GEORGIA
From 15-DEC-10 17:00:00 to 16-DEC-10 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Paulding County 911 Center reported up to 0.1 inch of glaze ice across the county.  Hundreds of accidents were reported across the county.

Winter Weather in POLK, GEORGIA
From 15-DEC-10 16:00:00 to 16-DEC-10 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Polk County 911 Center reported up to 0.1 inch of glaze ice across much of the county.  Numerous traffic accidents were observed throughout the county.  One person was injured in a traffic accident on U.S. Highway 27 North near Cedartown.

Winter Weather in TOWNS, GEORGIA
From 15-DEC-10 21:00:00 to 16-DEC-10 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Towns County 911 Center reported up to 0.1 inch of glaze ice across the county.

Winter Weather in UNION, GEORGIA
From 15-DEC-10 20:30:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Union County 911 Center reported up to 0.1 inch of glaze ice across the county.

Winter Weather in WALKER, GEORGIA
From 15-DEC-10 18:15:00 to 16-DEC-10 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Walker County 911 Center reported up to 0.1 inch of glaze ice across the county.

Winter Weather in WHITE, GEORGIA
From 15-DEC-10 20:30:00 to 16-DEC-10 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The White County Emergency Management Director reported up to 0.1 inch of glaze ice across much of the county.

Winter Weather in WHITFIELD, GEORGIA
From 15-DEC-10 18:15:00 to 16-DEC-10 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

The Whitfield County 911 Center reported up to 0.1 inch of glaze ice across the county.