Some notes for the Triad
The trends east on the last few runs of the HRRR/RAP seem to be due to a layer of dry air not far above the surface. Could be hard to overcome.
Compare this to last night's sounding at GSO when very light snow was falling. Even with dry air working in from the front, the column is fairly well saturated.
Finally, you can see this layer of dry air just above the surface already showing up this morning, so the HRRR, may, unfortunately be correct.