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Boston weather: Weekend outlook, milder Saturday then cooler Sunday

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Metro Boston, North Shore and Metro West: Enjoy the milder temperatures Saturday because arctic air will return Sunday night with significantly colder temperatures, perhaps even record cold overhead on Monday and Monday night.

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Before we get there our weather is expected to turn milder today as low pressure skirts across New England to our north. Most of the associated precipitation with this disturbance will remain to our north and west but there is a chance that a few light showers cross the local area. We may briefly warm up into the low 50s in the Boston metro area this afternoon as a warm front lifts northward to be quickly followed by a cold front. This cold front will not be the one that brings the much colder air.

Cooler temperatures Sunday will be a forerunner of what’s to come Sunday night into early next week. An arctic front pushes through during Sunday and this will introduce the bitter cold air mass that could set records on Monday. With temperatures falling to around 10 degrees both Sunday night and Monday night, with daytime highs likely not reaching 30 on Monday, those readings will be far more representative of January or February readings instead of late March. Sunshine both Sunday and Monday will do very little to add any warming to either day. Gusty winds will make it even more uncomfortably cold as the arctic air mass takes a firm grip on the region.

With the cold air locked in across the area and a storm brewing to our south there are concerns that accumulating snow may arrive here Tuesday night into Wednesday. There is little question a powerhouse storm will take shape over the open waters south of New England by mid week, passing southeast of Nantucket at that time. You know the drill by now. Three scenarios are possible. One is a complete miss, perhaps bringing some wind along the coast. Two, a brush by which would bring light snow accumulations, especially closer to the coast and gusty winds. Three, a direct impact with gale force winds, high seas, possible coastal flooding, significant snow accumulations and drifting and the possibility of power outages.

Stay tuned to local weather and news outlets, the National Weather Service or here for updates over the weekend and especially early next week on what could be an important weather maker for the area.

Three Day Outlook:

Saturday: Chance of a passing shower, becoming partly sunny this afternoon. Turning milder and windy. High temperatures upper 40s Merrimack Valley to low 50s in Boston. Gusty southwest winds over 30 mph this afternoon.

Saturday night: Clearing skies, windy and cooler. Lows from the mid 20s interior to about 30 in Boston. Gusty west winds diminishing late.

Sunday: Mostly to partly sunny, cooler and breezy. Highs near 40. West to northwest winds 12 to 25 mph.

Sunday night: Partly cloudy, windy and turning bitterly cold. Lows in the low teens, some single digits interior are possible. Gusty northwest winds continue.

Monday: Bitterly cold to start with highs only in the upper 20s despite sunshine.

Monday night: Very cold under mainly clear skies. Lows in the upper single digits to low teens.

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