They have also raised the temperatures up by 1° meaning for the NY metro area which will see 35° there will be less initial accumulation of snow as it will melt instead, and there may be slight mixing with sleet/rain. Slightly more will accumulate on onpaved surfaces.
However the bigger change is how the storm will be moving, which is slightly more south. This means that NYC may see less with long island (especially east) still seeing similar values.
The GFS moved the storm 10-20 miles SE, the NAM is remaining well south with far less accumulations, and the EURO has started to also track south slightly.
The common theme is a first snowfall time on Sunday between 11am-1pm, ending at night between 6am-8am
Our current estimate for snowfall and actual accumulation, and start/end times:
NY metro area: 2-3" falling, .50-1" less accumulating SUN 12PM - MON 7AM
Inland Northern NJ, Lower Hudson Valley 1-2" falling, .50" less accumulating SUN 12PM - MON 5AM
Connecticut: 1-3" falling, most accumulating SUN 12PM - MON 5AM
Eastern Connecticut: 3-4" falling, .50" less accumulating SUN 1PM - MON 9AM
Long Island: 3-5" falling, 1-2" less accumulating SUN 12PM - MON 8AM
NYC Snowfall Timeline (again, less will accumulate with temps above freezing):
Little if any accumulation up to 2PM.
2PM to 6PM: .50-1" possible, mainly on unpaved surfaces
6PM to 2AM: 1-2" possible
2AM to 8AM: .50 possible
Sunday temps 33-35°, Sunday night temps 33-35° before 2AM, down to 31° around 5AM, Monday temps to 45°