NWS updated their snowfall maps for the entire event, which should start in the wee hours on Friday and continue through about noon. Still 66 hours from the start of the event vs. the 12Z model suite which initialized at 7 am EST this morning (and 60 hours from the 18Z model runs coming out now, which doesn't look much different from the 12Z models, which the NWS maps are based on mostly), so still uncertainty on the track and intensity of the precip, leaving a variety of solutions on the table. If the NWS forecast verifies, this could have a significant impact on the Friday morning rush hour.
This includes everything from a coastal hugger bringing fairly heavy snows to all for awhile, followed by a changeover to rain for the coast and maybe up through 95, holding accumulations down there to a track towards the 40N/70W benchmark (favored now), which brings all snow for most (with a general 3-6" except at the immediate coast south of about Pt. Pleasant), to a track that goes out to sea more, with the heaviest snow S and E of 95 and less NW. An all rain event and a complete miss are essentially off the table. Also, if the system strengthens faster than forecast, 6-8" amounts could come into play (more likely for LI/coastal New England), while if the storm sputters, a more general 1-3" could be more common. Discussion below.
https://www.weather.gov/phi/
https://www.33andrain.com/topic/2073-1722-east-coast-winter-weather-event/page/10/
Area Forecast Discussion
National Weather Service Mount Holly NJ
359 PM EST Tue Jan 4 2022
The forecast gets interesting again Thursday night into Friday
as the next coastal storm continues to develop and then move
north. The deterministic model guidance has generally shifted a
bit farther south/east with the track of the low over the past
24 hours while ensemble guidance continues to hint at a track
farther north and west. Thus, still lots of uncertainty
regarding the track of the low and its impacts at a given
location. At this time general model consensus brings most of
the forecast area at least some accumulating snow and this is
highlighted by the latest forecast. Within this broader area of
snowfall though there will be the potential for an area of heavy
snow to set up with 4-6+ inches of accumulation. A low track
near the coast would result in snow changing to rain near the
coast with higher totals N/W of the urban corridor while a track
farther S/E would bring the higher totals near or even S/E of
the urban corridor similar to Monday`s system. Please continue
to monitor the forecast for updates as we refine this over the
next day or two. Period of greatest concern looks to be
overnight Thursday night into Friday morning with the low
quickly exiting in the afternoon. Strong NW winds gusting 20 to
30 mph should follow in it`s wake by this time though.