I listened to the CWG guys Facebook update tonight, at this point they seem to have little confidence in the forecast. The rain-snow line has shifted in later models far to the East, to the point where everything west of I-95 would get heavy snow. Earlier models had the bulk of the snow in the I-81 corridor with the western DC suburbs only getting a couple of inches.
I suspect this will be one of those storms where they won't have any confidence in snow totals until Tuesday evening. It's going to be very cold the rest of the week, so whatever we get on Wednesday into Thursday will stick around for a while.