840 AM update:
SPC mesoanalysis indicating 973 mb low just south of the
benchmark. Winds are backing more to the N and allowing colder
air to filter south and east into SE MA where temps have fallen
to 30F, and upper 20s at BOS. As the storm gets east of 70W
this colder air will reach SE coastal MA by midday and
eventually Cape Cod early afternoon. This is good news as snow
character will become drier. Eventually the mesoscale band
impacting RI and SE MA will clops and move eastward by 18z
reducing the heavy snowfall rates.