According to Paul Douglas (pers. com) there is some important news on what Jonas still has planned.
There is likely to be major flooding along the coast of Cape May, and in some areas of New Jersey there may be coastal flooding nearly of the magnitude that happened with Superstorm Sandy. So far storm surges have exceeded the original predictions.
The region from Washington DC to New York is likely to have another half foot or more of snow, and storm totals will be two to three feet with much larger drifts over that area. This snow will taper off this evening over much of the area.
The map at the top of the post is a prediction for the snowfall totals for this storm (from here).
Jeff Masters notes, "This storm will certainly rival some of the biggest mid-Atlantic storms in recent decades, and some model runs have cranked out snow totals beyond historical precedent."
For the northern regions affected by this storm, the areas it is moving into now, there is less certainty.
So far there are many places with 12 to 20 inches of snow on the ground across western New Jersey, the DC area, large areas of Virginia, West Virginia, and Pennsylvania. New York around the city haws already seen a foot or moe in many places.
Boston is going to get a more normal snow storm, just a few inches total.
There have already been major power outages in North Carolina.