Maximum temperatures will struggle to go much above 32 today, meaning some Metro Atlanta locations will spend 84 hours of sub-freezing readings until the mid to upper 30s return on Wednesday afternoon. However, old man winter is not done with us yet.
A weak low pressure system is expected to form in Texas and heads East-Northeast tomorrow into Thursday tracking to the NW of Chattanooga Thursday morning, a secondary low forms on the cold front in NW Louisiana and tracks to between Athens and Augusta by Friday morning. (see map) It will provide some light "over-running" precipitation-- when warm moist air runs up on top of colder denser air near the surface. Depending on the timing of the moisture's arrival, there could be some snow, sleet and freezing drizzle before a changeover to just light rain or drizzle by Thursday. If the moisture is too little it may mostly evaporate before reaching the ground or if it arrives late it may allow temperatures to recover enough to keep it just rain.
As of now it looks like amounts will be very light, just a tenth to quarter of an inch total liquid equivalent. (that means non-liquid types would be even less than this) Snow is the least likely outcome if model thermal profiles are correct, with sleet and freezing drizzle more likely (regular old rain that freezes only upon making contact with a sub-freezing surface such as a bridge, overpass, street sign, power line or tree etc). Sleet is ice pellets that bounce when they fall, often mistaken for small hail. As of now it looks like most roads in Atlanta would be warm enough to keep problems restricted to bridges and overpasses and maybe not even a problem for that.
In fact keep in mind that as of now snow is the least likely type, freezing drizzle the most likely but only briefly with a change-over to just plain light rain or drizzle for everyone as temperatures rise tomorrow night.
So will this be a big deal? Probably not, but we can never be 100% sure about weather.
A wintry mix is possible for at least some period of time as far south as a Newnan to Hampton- McDonough line, however the greatest risk of ice accumulation looks to be along and North of a Cartersville to Buford to Athens line late tomorrow afternoon OR tomorrow night. These are best estimates as of now and are obviously subject to change and revision in the future, so check news-talk radio AM 750 and 95.5 FM for the latest updates.
The potential for a storm system Friday-Sunday is still on the table. However, the models continue to show a high degree of variability in their handling of this system. The GFS is still the most impressive with it while the Euro is still a little out to sea and weaker.
If the GFS is correct, parts of the Southeast U.S. could see a rain changing to snow scenario on the weekend, probably Tennessee and NC/SC. Right now I favor the GFS over the ECMWF but I am not confident in any solution from the numerical equations at this point so no part of the Southeast can be ruled out yet