Thursday night and Friday...
The main concern with this forecast package revolves around very
late Thursday night into Friday. We have high confidence that
accumulating snow will impact the region and likely Friday morning
commute as well. However, the amounts and westward extent of the
heavier QPF field remain uncertain at this point. We will break
things down a bit more below.
A pretty impressive shortwave across the Ohio Valley on Thursday
will move eastward into New England very late Thu night into Fri.
This will back the 700 mb flow and induce modest mid level
frontogenesis. Specific timing is uncertain given the time range,
but expect snow to overspread the region from southwest to northeast
after midnight. It will probably be snowing in most locations by
daybreak.