I urge everyone to read wpc's snow and ice discussion. It's one for the ages and should be saved. For our neck of the woods i'll highlight
Heavy icing is also expected farther east into the southern
Appalachians and southern Mid-Atlantic. The setup across the
southern Mid- Atlantic down as far south as northern GA and areas
just inland from the coasts of the Carolinas is an extreme case of
CAD with a 1040mb high situated over the Interior Northeast on
Saturday night. While regional soundings indicate there may be
considerable sleet in this area as well, especially across southern
VA into northern NC, these CADs are notorious for their effective
dry/isallobaric flow, enhanced by precipitation, leading to dry
wet-bulb advection offsetting the latent heat of freezing during
freezing rain. With such an impressive high in place at
precipitation onset, this will likely result in considerable
accumulations of sleet and freezing rain here, too, with WPC
probabilities indicating a moderate risk (50-70%) of at least 0.5",
highest across the Piedmont. The guidance has trended just a bit
colder this afternoon, but significant icing is also possible as
far north as Richmond, VA and towards the Chesapeake Bay.