This map is the combined storm threats the next four days, I included the Thursday storm because I believe that the models will come northwest with the coastal storm on Thursday enough to add a few inches to the forecast for Cape Cod.  I believe 12"+ will occur on the Cape, south and north shores of Boston, MA as this is combining all three events which it looks like all three will contribute 3-6" of snow to this part of the region.  Most of the rest of the region will be 6-9 or 9-12" from the Wednesday event alone.  Coastline gets their snow Wednesday into Thursday from two likely different events