The greatest departures from normal for this upcoming cold always looked like they would be south central plains into the southeast. Anything coming into the Mid-Atlantic / Northeast will be greatly muted for the reasons you all suggested. Also, not great snow cover over the Plains, Mid-West / Ohio Valley either so even eastbound could will be modified. Gold standard for Arctic outbreaks is -40 at 850, not seeing that either. At least over the next 7-10 days. Still, this looks like a solid stretch of BN cold upcoming even if it is against our warmest set of normals on record.