By 7 AM Monday it will be snowing across the southeastern half of CT, NY City, Long Island, southeastern MA, RI, and the southeastern half of NJ. Snow will begin after 7 AM across the rest of the region. The map below is my current snowfall forecast through Monday night. There will be some areas of snow & flurries around at times Tuesday & Wednesday that could produce up to another 1"-3" in parts of the region. I'll try to refine that tomorrow. Temperatures will be below freezing most of this week, with an arctic surge scheduled for the end of the week.
11:00 AM CT snow amounts: Middletown 7.25", Colchester 7.5", Vernon 6.75", Groton, Haddam & Old Saybrook 5.0", Danbury 2.75", Milford 7.0", Litchfield 3.0", Waterbury 4.25". Radar below is from 11:23 A.M.
The snow will end from west to east across most of CT & Long Island between 11 AM & 3 PM, a little later than that near the CT/RI border and not until this evening in southeastern New England. Some 9 AM CT Snow amounts: Meriden 3.25", Vernon 1.25", Colchester 4.0", Groton & Old Saybrook 3.0", Milford 3.5", Danbury 2.5", Litchfield 2.75", Waterbury 2.0". Image below is HRRR forecast radar for 2 PM.
A Sloppy Morning Commute Friday. Temps in CT are still 45-50 right now (6:35 P.M.). They have a long way to drop to be cold enough for snow. There is some scattered, light rain in parts of Long Island & southern CT now. The precipitation will keep moving up from the south tonight. The temperature aloft will get cold enough for snow by the predawn hours. I think in a lot of places the temperature in your backyard will stay above freezing the whole time (through early aft...ernoon Friday). That means this will be a heavy, wet, sloppy, slippery kind of snow. Should taper in CT by noon-1 P.M. Later further east. Not super confident about snow amounts, but I think the Euro (pictured below) has as good a forecast as anything. North American Model (NAM) has higher amounts, but I think it will be too warm for them to materialize. Basically 6"-10" from northeast CT north & east into MA. Mostly 2"-6" elsewhere. Amounts drop off quickly when you head west of CT. Winter Storm Warning in pink and Winter Weather Advisories in purple below match up well with the Euro snowfall forecast.