Metro Boston, North Shore and Metro West: Typical March weather is in store for the remainder of the week. Monday was a microcosm of what March is all about. Morning snow gave way to bits of sun with temperatures climbing well into the 40s in the afternoon melting any small accumulations that occurred during the morning.
Tuesday will see temperatures climb into the low 50s for many of us, yet we are talking about snow in the forecast later on Wednesday. Milder air has overspread the region ahead of an approaching cold front. The front actually moves through here early today but the colder air mass does not arrive in earnest until Wednesday and more so Wednesday night.
The front will get hung up along the south coast of New England Tuesday night. Meanwhile, low pressure will have moved out of the Plains States and into the Ohio Valley by Wednesday morning. It is expected to be centered in southeast Pennsylvania by Wednesday evening. Precipitation should arrive here around midday Wednesday with a mix of rain and snow far interior to all rain closer to the coast. During the day temperatures will remain fairly steady from the overnight lows as the cooler air continues to filter into the region. The low is expected to track across southern New England and then offshore east of the Boston area and into the Gulf of Maine by Thursday morning. The exact track will be critical as to where the rain/snow line sets up. Right now it appears the metro Boston area will have mostly rain through the day with a change to a wintry mix and then all snow late overnight as the storm pulls away to our east. The further north and west you go the earlier the changeover to all snow will occur at night.
By the time the precipitation changes to all snow, especially across the coastal plain, the better chance that the heaviest of the precipitation will have already moved through. If this holds true then accumulations will be on the light side across the coastal plain and metro Boston. Further inland you will have a better chance of a few inches accumulation Wednesday night and early Thursday morning before the precipitation shuts down altogether.
A blast of bitter cold air will follow on the back side of the departing storm Thursday night and early Friday morning. We will be flirting with near record low temperatures Friday morning as temperatures crash into the teens. The record low in Boston for March 14th is 12 degrees set in 1896.
Early in the weekend another low tracks to our north across southeast Canada dragging milder air back into the area with a threat for rain showers Saturday.
So, expect several ups and downs through the week which is very typical of the month of March.
72 Hour Outlook:
Tuesday: Quite mild with sunshine and a moderate breeze. Increasing clouds late. High temperatures into the low and mid 50s.
Tuesday night: Becoming cloudy. Lows around 30 inland to mid 30s along the shore. Light west winds.
Wednesday: Rain along the coastal plain, rain and snow mixed elsewhere quickly changing to rain through the afternoon. Much cooler, high temperatures in the mid 30s inland to around 40 along the coast. East winds 5 to 15 mph.
Wednesday night: Turning much colder and windy. Precipitation gradually changes to all snow from northwest to southeast. Lows slipping into the upper teens to low 20s. Gusty north winds after midnight.
Thursday: Early snow or snow showers will give way to a mostly cloudy and windy afternoon. Highs only in the mid 20s.
Thursday night: Partly cloudy, windy and very cold. Near record lows as temperatures crash to the low to mid teens. Wind chills likely below zero.