Changes to the overall upper-level pattern across North America during the next week or so will result in much colder air for the second half of the month of January in the Mid-Atlantic/NE US. The upper part of the atmosphere will evolve into a pattern that features high-latitude blocking across Greenland/northeastern Canada, high pressure ridging across the west coasts of Canada and the US, and even “cross-polar” flow which could transport Siberian air to this side of the North Pole. In addition, numerous waves of energy aloft will ensure the recent active weather pattern continues with numerous storm threats in coming days for much of the nation. One storm system will bring accumulating snow on Friday to the southern Appalachians from northeastern Georgia to southwestern Virginia and another system next week could threaten the Mid-Atlantic/NE US with snow and/or rain.
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A strong frontal system will bring us the chance of showers today and it’ll stay on the chilly side with highs likely confined to the upper 40’s. It is possible that enough cold air mixes in over the next 24 hours or so for snow shower activity to form in the region. Drier and cool conditions will settle in across the region on Friday night and last through the upcoming weekend.
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While there certainly has been some moderate cold in the Mid-Atlantic/NE US in the first part of the month, the overall weather pattern that is unfolding will likely result in much colder air relative-to-normal for the second half of the month of January. The upper part of the atmosphere will evolve into a pattern that features high-latitude blocking across Greenland/northeastern Canada and high pressure ridging across the west coasts of Canada and the US. This combination will allow for the transport of increasingly cold air masses into the Mid-Atlantic/NE US as we progress through January. In addition, numerous waves of energy aloft will ensure the active pattern continues as well with many storm threats to come in coming days for much of the nation.
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High pressure will continue to control the weather around here today, but then we’ll become influenced on Thursday by an increasing moist flow of air as low pressure approaches the region. As a result, the chance of showers will increase tomorrow and it’ll stay unsettled later in the week as it turns colder. With temperatures trending downward later in the week, snow showers could develop in the region – something to monitor as the week progresses.
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High pressure will continue to control the weather around here for the next couple of days, but it’ll remain on the cool side despite some sunshine. A cold front will arrive in the area tomorrow night and it could feature some shower activity into Thursday and temperatures will be on the chilly side for much of the second half of the week.
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The overall weather pattern has been quite active in recent days in the eastern US with two different storm systems impacting the area in just the last three days. Numerous signs in the atmosphere point to a continuation of the stormy weather pattern in coming weeks across the eastern US and it is likely to become increasingly colder - raising the chances for accumulating snow. An on-going stratospheric warming event raises the prospects for high-latitude blocking in coming weeks which, in turn, increases the chance for increasingly colder outbreaks into the Mid-Atlantic/NE US. Teleconnection trends in such indices as the North Atlantic Oscillation (NAO) support the notion for a sustained period of high-latitude blocking which, in turn, would be more favorable for coastal storm development. In the near-term, one storm will likely push to the Carolina coastline on Friday and it may then stay to the south and east of the DC-to-Philly-to-NYC corridor as it heads out-to-sea - but it still needs to be closely monitored. Another winter storm is likely to threaten the southern and eastern US during the early or middle parts of next week as the active pattern continues.
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High pressure will shift to the east of here today and southerly flow will develop across the region boosting temperatures well up into the 50’s. A cold front will move across the Southern Plains later tomorrow and it should cross our region as a dry frontal passage. An upper-level low could impact the region later in the week with chilly conditions and the chance of rain and/or snow showers.
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A nearby frontal system will keep it somewhat unsettled around here for the next couple of days with a chance of showers and maybe even a thunderstorm as we begin the new year. Temperatures should climb into the 60’s for the next couple of days, but a frontal passage will usher in cooler air for the early part of next week.
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In the wake of a cool frontal passage, it turned cooler on Tuesday across the Tennessee Valley, but milder conditions will arrive today as high pressure shifts eastward across the Mid-Atlantic region. Low-level winds will shift to a south-to-southeast direction around here today and this will likely boost afternoon temperatures to the lower 60’s. In fact, temperatures should climb to the 60’s for much of the second half of the week and there will also be an increased chance of showers and thunderstorms.
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An active weather pattern will continue into the new year for the eastern half of the nation with one low pressure system bringing a potpourri of precipitation on Friday and then a second system late in the weekend that should intensify near the Mid-Atlantic coastline. The first system will result in accumulating snow for parts of the Upper Midwest and Ohio Valley on New Year’s Day (Friday) and mainly a rain event for the Mid-Atlantic region. However, it can be cold enough at the onset on Friday in the Mid-Atlantic region for a brief period of sleet and/or freezing; especially, in areas north of the PA/MD border. Late in the weekend, a second low pressure system will likely intensify near the Mid-Atlantic coastline and it would have an influx of colder air – a potential setup that needs to be monitored in coming days.
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