Here we can see the precipitation is still going strong in SWVA and the dry slot has shrunkover SW NC.. you can also see a classic "comma head" starting to form over Tn/Alamaba/Georgia.. By now all of SWVA has gone over to heavy snow.
3 hours later we can clearly see the dry slot never made it out of SWNC and all of SWVA into NWNC is still in heavy snow.
This dry slot doesn't fully develop because this is not your typical low. The low is going "negative" over the Georgia/SC area. As this happens, that back edge of the precip in Tn/Georgia that "dry slot" will slow down and eventually fill in very nice. As this low goes negative it will only act to enhance the snowfall rates over SWVA/NWNC. I won't show the images here but most data points to a 4-7 hour period of 1-2-3" rates PER HOUR. Folks that is HEAVY snow. I also believe there will be a little bit of upslope enhancment from the easterly flow along the Southern Blue Ridge.