From the National Weather Service:
The National Weather Service in Peachtree City has issued a Dense Fog Advisory, which is in effect until 9 a.m. Thursday.
Locations…Portions of West-Central Georgia,generally south of a line from Rome to Dahlonega and north of a line from Columbus to Milledgeville. This includes the Atlanta Metropolitan area.
Visibilities…Widespread visibilities of quarter mile or less.
Impacts…Low visibility will make travel difficult. Motorists are urged to increase their following distance and allow extra time to reach their destinations.
What it means … A Dense Fog Advisory means visibilities will frequently be reduced to less than one quarter mile. If driving…slow down… use your headlights…and leave plenty of distance ahead of you.