The temps initially are what are going to make the snow relatively tough to accumulate readily. Seen this with the Jan 6-7 storm. All snow but struggled in the beginning with 33-34F temps never mind the 36-36F to the south in that event that mad it tougher. So, I believe that is what the Mets are trying to get at with their snow accumulation maps at the National Weather Service in Norton. Nobody is getting a settled snowfall depth of 18" out of this. That's the Color Code Range, not the prediction. Even when colder mid-levels crash in, the intensity will be key to the wet bulb. Once again Speed, Temp and Track are paramount.