I live in west Somerville but work mostly out in East Somerville and East Cambridge. I have plowed my driveway with 2 or 3" and driven 3 miles east to be met with a dusting or sometimes rain. I don't think it will be that bad but I do expect a gradient.
That wind is a bitch to forecast. Having just watched the TV Mets they are also putting up caveats about it. Bz just posted a map about the area of greatest uncertainty and it was boston down 24 to 495.
FWIW Bouchard has a graph showing in Boston metro being above freezing until late Sunday morning and not accumulating much until after Noon. Of course he also has Boston at 3" for a total.
Local Mets are all over the place. Some say a fast mover, others a long duration, still others say rain/sleet is an issue. Fisher mentioned shearing and strung out as an issue. Still early at least.
If it holds it looks like the 7th will mostly happen during the day. It's been awhile for decent accumulating snow here on the coast to happen in daylight hours.