More wintry weather will likely impact the area Tuesday and again over the upcoming weekend. The low pressure system that brought us the wintry mix and rain on Monday has moved into Canada. Colder air settled in behind the system overnight and now we have to deal with a disturbance in the upper levels along with moisture streaming northward into southern New England. With the cold air in place you can expect any precipitation that we do get on Tuesday to be in the form of snow.
The unsettled weather will be confined to southern New England on Tuesday with areas along and near the south coast likely receiving accumulating snow. Locally the snow is expected to begin around mid morning. It should remain on the light side as the bands of steadier snow stays well south of Boston. Although the snow is probably going to continue for most of the day accumulations locally are expected to only be a coating to perhaps 2 inches, with the lesser amounts in the Merrimack Valley. As was the case on Monday this is by no means a big event but certainly bears watching as to timing. Mondays event hit just before and during the morning commute causing significant delays for many. We should get the morning parade to work completed before the flakes begin to fly on Tuesday. If any of the bands of steadier snow tracks a bit further north into the Boston area then we can expect a bit more snow accumulation.
This should all wind down and end by evening as the system moves offshore. Behind it will be another surge of colder air Tuesday night and it will remain mainly dry and unseasonably cold for the duration of the work week.
An arctic front brings a much colder air mass here sometime Wednesday night, maybe very early Thursday morning, and could trigger a few flurries with its arrival and passage. The main feature from Wednesday into Friday will be a large high pressure system that will be expanding eastward through the period.
Then, we focus on the potential for a coastal low to develop early this weekend. With the cold air in place we have to think about the possibility of more wintry precipitation at that time. More on that weather potential mid and late week.
72 Hour Outlook:
Tuesday: Cloudy, occasional periods of light snow breaking out mid to late morning and continuing in the afternoon when a period of steadier snow is possible. Very little accumulation likely, mostly a coating to two inches. High temperatures in the low 30s. West winds 10 to 20 mph.
Tuesday night: Clearing skies, breezy and colder. Lows in the upper teens inland to mid 20s in the immediate Boston area. West winds up to 20 mph.
Wednesday and Wednesday night: Mostly sunny day, becoming partly cloudy overnight. Slight chance of a passing flurry at night. Unseasonably cold. Highs in the low 30s, overnight lows from the mid teens to 20 degrees. Gusty west winds to near 30 mph at times.
Thursday and Thursday night: Partly cloudy. Chance of a flurry during the day, otherwise dry with frigid temperatures. Highs only in the mid 20s. Nighttime lows tumble into the low and mid teens, near 20 in Boston.