It is still quite early with the weekend storm and while I am confident that this will be a disruptive storm here are some things that could go wrong.
1. The storm track shifts west and most of us are left with a low impact event. Eastern MA does get into some of the snow and picks up a quick 3-6 inches. I don't think this will happen because that would mean the most reliable model (European) would have to completely change course.
2. The storm track shifts west. This is a growing possibility as the models have been shifting west with every run. In this scenario all of the major cities and coastal locations are left with cold rain mixing with snow at times. Interior areas could still pick up 3-6 inches.
3. The storm tracks to fast. This storm is going to have plenty of moisture and if conditions are right, enough cold air should filter in for snow. So why isn't everyone getting a major snowstorm? The storm will track too fast. If for some reason the storm were to track faster it could easily cut snowfall amounts in half.
All the details should be ironed out tomorrow, when I release my first snow map.