With a storm such as this, when the extreme is about to happen, sometimes it is easier to just say, PREPARE for the worst.
This image above from the NWS - Boston is very well done and in line with what I would come up with on my own.
Here is what you need to take away if you live in Boston.
- Snowfall - 20-28" of snow. Locally higher amounts, less just at the coast
- Wind - Getting up to 30-45 mph, much higher near 75 Cape and Nantucket
- Coastal Flooding - 2-4 foot storm surge. Overwash 9pm & 10 AM likely
If you want a more detailed snow map, here is one.
Map showing the very strong storm, with a calm center, Nantucket, may go calm. This is the sign of a very strong intense storm. The dark colors are wind.
Winds around the center of the storm rotate counter clockwise along the lines of equal pressure. Showing a very strong East Northeast wind.