A major pattern change to cold has now begun in the Mid-Atlantic region with the passage of a strong cold frontal system and it is going to get worse before it gets better. This initial shot of cold air is not brutal, not record-breaking by any means, but it is just the front end of a pattern change that will bring even colder air here for the late week and weekend, and then some big time cold is destined to flood the Mid-Atlantic region by the middle of next week. In fact, it is possible that DC, Philly and NYC will struggle to reach the freezing mark for highs by the middle of next week. In addition to the intensifying cold over the next several days, there are some prospects for snow in the I-95 corridor. The first chance of snow will come from later Friday into Saturday, the second shot comes Saturday night into early Sunday, and then the third threat comes in the Tuesday/early Wednesday time frame associated with the mid-week significant cold air outbreak.
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A major pattern change is going to begin on Wednesday in the Mid-Atlantic region and it will result in an extended period with colder-than-normal temperatures. This initial shot of cold will be followed by a reinforcing cold air mass this weekend and then a significant cold air outbreak is likely next week which may accompanied by a coastal storm. The pattern-changing cold front is now crossing the Ohio Valley and it is trailing a powerful storm just north of Lake Superior.
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A major pattern change is going to begin on Wednesday in the Mid-Atlantic region and it will result in a period of sustained colder-than-normal temperatures that will assure a much different December compared to the last five. This pattern change to cold will also include increasing chances for snow – perhaps as early as late this week or during the upcoming weekend – as an active upper-level trough forms in the eastern US associated with the initial cold blast.
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A major pattern change is going to begin in the Mid-Atlantic region during the middle of next week that will likely result in an extended period of colder-than-normal temperatures. In addition, snow will likely become a threat on multiple occasions during the month of December - potentially as early as at the end of next week.
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If you still have to put up outside Christmas lights and rake some more leaves then this weekend may be the last chance for awhile with seasonal temperatures in the eastern US. There are increasing signs for a major pattern shift to winter weather conditions in the central and eastern US beginning late next week that will feature a combination of strong upper-level blocking over the northern latitudes and a deep trough of low pressure over the central/eastern US. Once this pattern sets up it could very well stick around for much of the month of December which would, of course, increase our odds for a white Christmas. Before that, however, the overall weather pattern will be rather quiet for the next week or so featuring mild conditions for the next two days and then a rather unimpressive cold frontal passage that will bring us seasonably chilly air for the end of the week, weekend, and early part of next week.
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While we are celebrating a chilly Thanksgiving Day in the Mid-Atlantic region, Summit Station in Greenland will experience high temperatures around -40°F which continues the very cold and well-below normal trend for the month of November. Summit Station (also known as Summit Camp) is a high-altitude (10,551 feet) year-round research station in central Greenland and its exact coordinates actually can change since the ice sheet underneath is often on the move. In addition to the bitter cold, snow and ice accumulation throughout Greenland has been running at the high end of normal since the fall of 2016 - at times at or near record levels - and NASA/MODIS satellite imagery reveals significant growth in the Petermann Glacier from a low point reached five years ago. One of the important reasons for closely monitoring the snow and ice buildup on Greenland is that this region can be an important cold air source for the central and eastern US during the upcoming winter season.
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Somewhat reminiscent of the storm that brought down the “SS Edmund Fitzgerald” in November 1975, a major storm will develop over Great Lakes this weekend and produce dangerous wind gusts in that area and winds here in the I-95 corridor could gust to 50 mph or so on Sunday behind the passage of a powerful cold front. This next cold shot will continue an overall colder-than-normal weather pattern for November that looks like it will stay intact to the end of the month with additional cold air outbreaks to follow. In fact, another cold air outbreak is likely to reach the Mid-Atlantic region at mid-week and result in a cold Turkey Day for the entire Northeast US.
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The unfolding weather pattern across North America over the next couple of weeks virtually assures a colder-than-normal month of November for the Mid-Atlantic region and a quick start to the winter season. An initial Arctic blast this past weekend resulted in numerous record low temperatures and it is increasingly likely that a second Arctic blast arrives in the Mid-Atlantic region by Sunday of the upcoming weekend. Beyond that, “high-latitude blocking” in the upper part of the atmosphere is likely to help keep much of the chilly air in place around here during much of Thanksgiving week.
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Let the games begin…it is now snowing in State College and Altoona in upstate Pennsylvania and the look to winter is suddenly upon us in the Mid-Atlantic region. Low pressure today will head towards the Mid-Atlantic coastline and a cold rain in the I-95 corridor may actually end as a mix of sleet or snow tonight to the north and west of the big cities. A powerful cold front will arrive with gusty winds on Thursday night and usher in an Arctic blast for Friday and Saturday with the lowest temperatures of the season so far and possible record-breaking low temperatures in many spots An overall upper-atmosphere pattern with “high-latitude blocking” is looking increasingly likely for later this month and that could result in more cold air outbreaks for the Mid-Atlantic region by the time Thanksgiving week rolls around.
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The week started off on a warm note here in the Mid-Atlantic region, but it’ll turn noticeably colder tomorrow following the passage of a cold frontal system which will stall out over the southern Mid-Atlantic. In fact, low pressure will form along the frontal boundary zone on Tuesday and it’ll spread a chilly rain to many areas and there can even be some snowflakes mixed in tomorrow night in the higher elevations of northwest NJ and northeast/east-central PA. An even stronger (Arctic) cold front will arrive on Thursday night and this will be followed by an intense blast of cold air for Friday and Saturday which should result in the 20’s by early Saturday morning.
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