Kocin on TWC says the model that comes in between 10-10:30PM EST will nail the track down and the associated snowfall amount predictions.
The GFS will be in around then, TWC's model of choice. Most of the major short term models will be in around that time as well. NAM is running within the half hour.
http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/