Monday or Tuesday.

While there is still considerable uncertainty as to how far west the storm will move, windy and cold conditions are almost certain to develop over the western Carolinas. Damaging winds may develop over the mountains and foothills Monday, lasting into Tuesday night. Freezing temperatures are possible at higher mountain elevations Sunday night. By Monday night widespread freezing temperatures are expected across the mountains and possibly out across the foothills, with similar conditions possible again
Tuesday night. The strong northwest winds will result in snow shower activity along the Tennessee line. If the storm moves ashore farther to the south, then a significant amount of upslope snow is possible over parts of the mountains, particularly across the northern mountains and near the Tennessee line.

…Potential Impacts Across the Foothills And Piedmont…
Very windy conditions are possible Monday and Tuesday as Hurricane Sandy evolves into an extratropical storm and moves ashore over the mid-Atlantic or New England states. Winds may be strong enough to cause damage Monday or Tuesday afternoon if the storm comes ashore far enough south. There is also a chance that some locations will see freezing temperatures Monday and Tuesday night. Dry and windy conditions will result in heightened fire danger during the afternoon hours on Monday and Tuesday as well.