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Boston weather: Much colder Sunday, storm misses to our south late tonight

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Metro Boston, North Shore and Metro West: Here we are standing at the half way point of March and for the most part it has been an extension of the below normal cold that we experienced through the meteorological winter period from December 1st through February 28th. Although the snow has been rather insignificant in the immediate Boston area this month the cold has been another issue. Temperatures are running about 5 degrees below normal through the half way point of the month and we have several days ahead of us with more below normal cold before the mercury recovers back to more seasonal levels later this week.

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Although temperatures climbed well into the 40s and low 50s throughout the area on Saturday it is going to be a far different story on Sunday. The temperature swings continue as we go from a mild Saturday to a blustery and cold Sunday. All this thanks to the arrival and passage of a cold front last night that has pushed offshore. A strong and dominant high pressure system will expand southeastward out of the Great Lakes region and give us a period of dry but abnormally cold weather right through Tuesday night. In doing so the high is expected to suppress a storm to our south, one that will bring accumulating snow to the mid Atlantic States later Sunday into Monday.

With the storm system skirting out to sea well to our south we can expect to stay quite cold to start our work week on Monday as temperatures remain some 15 to near 20 degrees below the mid March average. Our average high for this time of year is about 46 degrees and we may not break 30 on Monday. With the cold days come even colder nights as temperatures are once again expected to collapse into the teens tonight and Monday night.

By mid week a disturbance and associated frontal boundary will begin to inch closer to our region. Computer models have varying ideas on what may occur later Wednesday and Thursday but at this time it appears we stay mild enough for any precipitation to remain liquid, at least at the start. There is the possibility of a coastal low developing and if that happens it holds in the colder air and that may create issues with a mix or change to snow, especially away from the coast. Since this possible event is four or five days out further speculation is just that at this point.

72 Hour Outlook:

Sunday: Blustery with gusty winds and much colder. Mostly to partly sunny. High temperatures in the low to mid 30s. Gusty west to northwest winds 25 to 30 mph.

Sunday night: Partly cloudy, windy and colder. Lows in the low to mid teens. Wind chills close to zero at times. Northwest winds may gust upwards of 25 mph.

Monday: Partly cloudy, breezy and cold. Highs only in the upper 20s to 30 degrees. Northwest winds 10 to 20 mph early, then north around 10 mph.

Monday night: Much below normal cold continues. Lighter winds under partly cloudy skies. Lows in the teens.

Tuesday and Tuesday night: Fair skies but not quite as cold. Highs in the 30s and overnight lows in the low to mid 20s.

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