Southern storm tracks are becoming more common over the last several weeks. This means gulf moisture interacts with very active storms which develop over Texas and trek east dragging cold air into areas that are not accustomed to seeing ice and snow accumulations like what will soon fall over the next 48 hours.
Current southeast radar image. LOOP HERE
The NWS in Atlanta issued this statement and graphic on the ice storm:
Same goes for the northeast through Friday early afternoon.