From the National Weather Service:
Still looking at an impactful winter storm for the region on Tue. Snow begins in pre-dawn hours with reduced visibility & icy roads for AM commute. Changeover to wintry mix/rain south of MA turnpike. Moderate ice accretion possible in Northern CT/RI. Arctic blast Wed night/Thu with Thu morning wind chills as low as -10 to -20°F.
(See additional briefing graphics below)