Good question and would add that a common mistake when SE folks are looking for snow is to focus on a high pressure to the north or worse, northeast of the Carolinas as your image progs. The High we want needs to be northwest near the Great Lakes supplying dry, arctic air. Too far east and the clockwise winds pull air from the Atlantic which modifies the cold air causing warming aloft. This is a classic Cold Air Damming setup which rarely produces snow but is classic for frz rain or if the column of air is cold enough, sleet. I've lost count how many times I've read "CAD" and snow in the same wishcast and it rarely works out. Carolina big snows come from a Gulf low that exits near Charleston to Savannah and strengthens as it moves up the coast with cold air coming from the NW, not NE. And sometimes, we get the trailing upper level low to cross the area with it's limited coverage area of snow but for those fortunate enough to get ULL snow, it is the postcard variety with higher ratios but usually is short-lived. Been tracking Carolina snows since the early 60's and the NW high/SE low is the combination we want for snow....if the high is too far east, no joy.
