A cold front will cross the region today and high pressure will build into the region as we approach the weekend. Temperatures will drop down a notch today compared to the mild conditions of yesterday and then the next two days and nights will turn out to be quite cold. A weak area of low pressure will arrive on Sunday and this could generate some snow shower activity in the region, but nothing significant. Another system will approach the area next Tuesday/Wednesday and it looks like it will generally be a rain event; however, there may be enough cold air at the onset for some frozen precipitation.
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A “clipper” system produced accumulating snow in the region yesterday and there will be a couple of additional weak disturbances moving along in the fast-moving upper-level jet stream over the next couple of days. High pressure will then build into the region by Friday and it’ll turn colder as we head towards the weekend. An area of moisture is likely to arrive in the region on Sunday primarily in the form of snow, but it does not look like it will result in anything significant.
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A fast-moving (a.k.a., clipper) low pressure system will spread snow into the Mid-Atlantic region this morning; primarily, on the north side of the PA/MD border. Accumulations are likely to end up in the 1-3 inch range across the NYC metro region with lesser amounts to our south. The pattern quiets down some later this week and remains generally on the cold side of normal.
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Low pressure is pulling away from the Mid-Atlantic coastline at this time, but it is intensifying as it does, and there will be enough instability in the atmosphere behind it to produce scattered snow showers in the DC-to-Philly-to-NYC corridor over the next few hours. There can also be a heavy snow squall or two this afternoon which would quickly drop visibilities, whiten the ground, and cause slippery road conditions. By tonight, this area of instability will push off the coast and attention will turn upstream where a fast-moving system will be dropping southeastward from the Northern Plains.
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Low pressure will pull away from the Mid-Atlantic coastline this morning, skies should gradually clear, and winds will pick up out of the NW. Another system will slide into the Northeast US on Tuesday from the Great Lakes region and bring with it the good chance for some snow around here.
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A colder pattern has become firmly established and now there is likely to be some accumulating snow in the DC and Philly metro regions during the late night and early morning hours. The NYC metro region is likely to be on the very northwest edge of the expected snow field. The greatest potential for a few inches of snow looks like it’ll be over the Delmarva Peninsula and the southern half of New Jersey where up to 3 or 4 inches are possible by later Monday morning at places like the Jersey Shore (e.g., Cape May). A potent wave in the upper atmosphere will set off the development of a surface wave of low pressure overnight and this system will likely bring the snow to much of the region late tonight and early Monday.
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A cold front passed through the region on Thursday and temperatures will drop down a notch from yesterday and the stiff winds will continue. Another cold front will push through late in the weekend and it should drop temperatures down another notch as we begin the new work week. A couple of fast-moving “clipper-type” systems could produce some snow in the Mid-Atlantic region during the early and middle parts of next week.
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A cold front will swing through the region today and it will begin a pattern change to colder that will be aided by a significant stratospheric warming event. A second frontal system will arrive late in the weekend and temperatures will take another notch down as we move into early next week. In recent years that featured a significant stratospheric warming event during the latter part of January, the month of February generally turned out to be colder-than-normal throughout the Northeast US.
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Weak high pressure builds across the region today and it should turn out to be a pretty nice day for late January. A cold front passes through the region on Thursday and this will begin a change to an overall colder weather pattern compared to our recent “thaw” period. Another cold front is likely to arrive in the region late this weekend and temperatures will take another notch to the down side. The colder weather pattern developing in the Mid-Atlantic region over the next few days looks like it’ll stick around well into the month of February.
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Strong low pressure will only slowly pull away from the Mid-Atlantic coastline today and the result will be more rainfall today in the NYC metro region. The winds have dropped off somewhat in intensity compared to last night as the tight pressure gradient has now shifted up the coast so that the strongest winds are currently at or near the New England coastline. The storm has pulled in some colder air and the rain changed to snow or ice in many interior, higher elevation locations during the overnight hours. Weak high pressure builds across the region on Wednesday.
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