Enjoy the storm folks. Looks like the second blockbuster event for you this winter. We're staring down another big bust south of Mason-Dixon. If it's not the mix line, it's a dry slot.
For those worrying about dry air:
1.) The dewpoint depression will decrease as temps cool overnight.
2.) The 00z and 12z RAOB from IAD will be important to see if there's any pockets of dry air aloft could spoil the WAA snows.