A relatively quiet stretch of weather will continue for much of the week in the Mid-Atlantic region. High pressure builds southward from Canada later today and controls the weather through Thursday. A weak cold front may generate some clouds on Friday and then a strong cold front may arrive late in the weekend with some rainfall ahead of it and colder air behind it for the early part of next week.
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Low pressure continues to impact the SE US, but we’ll remain under the influence of a high pressure system as we begin the new week A couple of weak frontal systems will cross the region over the next few days, but, in general, it looks like a quiet and moderately chilly week in the Mid-Atlantic.
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High pressure moved into the region on Thursday following the Arctic cold frontal passage and it’ll stay in control through the weekend. A couple of weak fronts may come through the area early next week, but in general, the weather will cooperate for any pre-Christmas travelers. A look ahead to Christmas Day suggests we’ll likely experience partial sunshine and moderately cold conditions with afternoon highs in the 40’s.
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An Arctic front crossed the region late yesterday and ushered in a much colder-than-normal air mass for this time of year. Temperatures today will be confined to the mid-to-upper 20’s for highs and brisk winds will produce even lower wind chills. The cold will become less harsh by tomorrow, but it’ll stay colder-than-normal going right into the weekend.
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An Arctic frontal system will arrive in the I-95 corridor later today/early tonight and it will be accompanied by strong wind gusts, snow showers, and heavier snow squalls. Any snow squall can reduce visibilities in a hurry, put down a quick coating of snow and create dangerous driving conditions. It’ll stay windy tonight and on Thursday and it’ll turn sharply colder with some of the lowest wind chill values and temperatures so far this season in the Mid-Atlantic/NE US.
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The low pressure system that produced a wintry mix around here on Monday and Tuesday has pushed away to our northeast and an Arctic cold front will arrive here late this afternoon from our northwest. The arrival of this Arctic frontal system will be accompanied by strong wind gusts of up to 40 mph, scattered snow showers, and perhaps even an isolated heavy snow squall or two. It’ll stay windy tonight and on Thursday as well and it’ll turn sharply colder with some of the lowest wind chill values and temperatures of the season so far in the Mid-Atlantic/NE US. The cold becomes less harsh at week’s end, but it’ll remain colder-than-normal going into the upcoming weekend.
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The low pressure system that resulted in a wintry mix of precipitation in the Mid-Atlantic/NE US over the past 24 hours or so will reach a position off the New England coastline by later today. This system will drag a cold front through the I-95 corridor by early tonight and winds will pick up as a moderately cold air mass moves into the area. Watch for icy spots later tonight as temperatures drop into the 20’s in most areas and there may still be some wet roadways. Another front will arrive in the I-95 corridor tomorrow afternoon and this front will represent the leading edge of an Arctic air mass. The arrival of the Arctic frontal system on Wednesday afternoon will be accompanied by strong wind gusts, scattered snow showers, and perhaps an isolated snow squall or two. It’ll stay windy tomorrow night and on Thursday and it’ll turn sharply colder with some of the lowest wind chill values and temperatures of the season so far in the Mid-Atlantic/NE US.
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Low pressure has moved nearby in the overnight hours and there will be occasional rain today that can still freeze on some untreated surfaces during the early morning hours in suburban locations. A strong cold front will push through the region early tonight and winds will become gusty behind it and it'll stay moderately cold overnight and on Wednesday. However, an even colder air mass will charge into the region late tomorrow after the passage of an Arctic cold frontal system. That system can bring some snow shower activity to the area later tomorrow and then it'll turn windy and sharply colder tomorrow night and Thursday with the coldest wind chills (and temperatures) of the season so far. Some moderation in temperatures will return by the end of the week.
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There will be two different parts to the current winter weather event with phase one already well underway and phase two coming from later today through Tuesday morning. Phase one featured some accumulating snow south of the PA/MD border earlier today and has had very limited precipitation so far north of the Mason-Dixon Line. Phase two will involve heavier precipitation amounts from later today into tomorrow morning as low pressure heads towards the region from the Lower Mississippi Valley. This second phase will generally feature ‘plain’ rain across the immediate DC metro region, but icing will be a big concern across much of PA, northern NJ and NYC where temperatures will hover around the freezing mark throughout the night as precipitation intensities pick up.
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Low pressure will intensify today over the Lower Mississippi Valley with a cold air mass in place across the Mid-Atlantic and NE US. There will be two different phases during this event with light, spotty snow for much of today and then heavier precipitation is likely late today and tonight and icing is the main concern for this round. Accumulations of snow today will be on the light side, but watch for slick spots on the roads in any heavier burst. With temperatures hovering near freezing tonight, icing will become the main concern; especially, across the northern and western suburbs and untreated roads can get quite slick. Precipitation continues on Tuesday mainly in the form of rain, but there can still be pockets of freezing rain and snow and sleet can mix in at times. It'll stay cold behind the storm on Tuesday night and Wednesday and then an even colder air mass will arrive for Thursday.
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