Here's the NWS Raleigh Discussion: As of 350 PM Sunday...
Surface low has emerged off the SE Coast and will pull slowly east- northeast away from the NC coast as a series of shortwaves eject east through the base of mid/upper level trough trough in place across the SE US.
Per 18z/9 GSO sounding, the cold deep near freezing isothermal layer did indeed prevail across the far northern/northwestern Piedmont, in the heart of the cold air damming region in place east of the mountains. As of 20z, latest reports coming in across that region have a snowfall maximum of 14 to 14.5 inches across Forsyth and Person counties. However, impressive mid-level dry punch overspreading the area from the west signals the loss of saturation aloft and ice crystals aloft, which will largely end the production of accumulating snow and sleet, that is until the arrival arrival of the next shortwave later this evening and overnight. Thus, expect the snow/sleet across the far northern zones to change-over to light freezing rain/drizzle to occur within the next hour.
The approach of the upper wave late this evening and overnight will lead to re-saturation and cooling aloft. At the same time, weak cold dry air advection on the back-side of the surface low moving farther offshore, will result in near to sub-freezing temps across the the northern two-thirds of the forecast area. The re-introduction of lift and ice into the cloud will result in another period of light snow/sleet across spreading east across the area. Additional snowfall amounts are expected to be light, ranging between a half inch to 1 to 1.5 inches across the far northern zones. While the far SE counties could see some a mix wet snow and rain, above freezing temps in the mid 30s will result in little to accumulation.