Forecast discussion: High pressure is moving into the Atlantic, as it moved offshore during Saturday. A low pressure center in Canada will bring the chance of some freezing rain to Boston during early Sunday morning. Despite having enough cold air in the atmosphere for snow, the entire atmosphere is not saturated, and most of the moisture is at a very low level. So, the precipitation will not have enough time to convert from a raindrop to a snowflake.
The wintry mix will change to plain rain by the middle of Sunday morning, as warmer temperatures arrive. All shower activity will end just past midnight. However, despite high pressure, there will be enough moisture to keep cloudy skies over us on Monday. During Monday afternoon, an area of low pressure will form off the east coast. The low will move towards New England on Tuesday. We will see rain showers by the early morning, and with easterly winds the chance of some coastal flooding is possible. The precipitation will end before the rush hour of the evening commute.
We will see mostly sunny skies during the early part of Wednesday, before a low pressure system passes to our north and west. We will see some passing showers during the evening, but ending early Thursday morning. Warmer air will be slowly moving back into New England on Wednesday, thanks to a passing warm front. High temperatures climb into the middle 40’s on Wednesday to the lower 50’s on Thursday.
A strong cold front awaits us for the following weekend. Rain ahead of the front will arrive by early Friday morning, before the front makes its way into the region on Saturday. Precipitation will end well before the cold front passes through, so we will not see any snow. However, some of the coldest air of the season is expected behind this front. We will begin to feel the full effects of the front by next Sunday.
72 hour forecast:
Tonight: Overcast with passing freezing rain or a flurry with a low of 29.
Sunday: Mostly cloudy with any scattered wintry mix changing to scattered rain showers by mid- morning. We will see a high of 47. Winds will come from the south-southeast at 6-9 mph.
Sunday night: Mostly cloudy with scattered showers until 1 a.m. We will see a low of 36 with winds turning to the north-northwest at 5-8 mph. Patchy fog will develop after midnight.
Monday: Mostly cloudy with a high of 45.
Monday night: Mostly cloudy with a low of 38.
Tuesday: Mostly cloudy with light rain starting by 2 a.m. and a high of 43. Rain ends by the late afternoon.
Tuesday night: Partly cloudy with a low of 33.
Wednesday: Mostly sunny with increasing clouds by the early afternoon. Showers arrive around 10 p.m. Highs 44-47, lows 33-36.
Thursday: A passing shower during the early morning, then partly sunny and mild. Highs 50-53, lows 37-40.
Friday: Overcast with showers/rain arriving by about 4 a.m. Highs 50-53, lows 37-40.
Saturday: Overcast with showers/light rain ending in the evening. Highs 44-47, lows 27-30.