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 a 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 - perhaps even a snow squall - 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 over the Lower Mississippi Valley on Monday with a cold air mass in place across the Mid-Atlantic and NE US. This system has generated a west-to-east swath of precipitation that will likely only skirt the NYC metro on its north side during much of the day before more substantial precipitation arrives tonight. With the cold air in place, any precipitation today will be in the form of snow followed by a mix of snow, sleet and freezing rain tonight with small accumulations of up to a couple of inches. There can be some impact on road conditions tonight; especially, in the northern and western suburbs of the NYC metro area. Temperatures will have a hard time rising above the freezing mark and any changeover to later rain tonight will likely still result in some icing as temperatures hover near the freezing mark. Occasional 'plain' rain is likely on Tuesday before the passage of a cold frontal system that will shut off the precipitation. It'll stay cold behind the storm on Wednesday and an even colder air mass may arrive on Thursday.
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One storm system continues to impact the Mid-Atlantic/NE US today with brisk NW winds and another one will impact the same area from Monday into Tuesday. The next storm will intensify over the Lower Mississippi Valley early Monday and it will take a track across the central Appalachians and to the southern New England coast by Tuesday afternoon. As the storm intensifies on Monday, it will generate a west-to-east swath of precipitation that will push into the Mid-Atlantic region during the morning or mid-day hours on Monday. The air is likely to be cold enough for a period of snow and/or ice at the onset and there are likely to be some small accumulations before any changeover to rain; especially, from the northern and western suburbs of DC to areas near and north of the PA/MD border. The precipitation will intensify on Monday night and with temperatures hovering near freezing north of the PA/MD border, a significant buildup of ice is on the table.
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