An Arctic air mass pushed into the Mid-Atlantic region on Thursday and it stays quite cold today with an increase in cloud cover as an upper-level disturbance heads in this direction. This system can produce some snow in the area later tonight and on Saturday morning and perhaps a mix of rain and snow on Saturday afternoon...small accumulations are possible. Another system will try to slide up along the east coast on Sunday and it can bring some snow to the DC metro region during the second half of the weekend...accumulations are possible. More Arctic air is on tap for the Mid-Atlantic region during the first half of next week with bitter cold conditions expected here on Monday night, Tuesday, and Tuesday night. The overall pattern stays very cold through the second half of the month in the eastern US and it can include some extreme cold.
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An Arctic air mass has reached the eastern US today on the heels of a strong cold frontal system and this winter chill will extend all the way down to the state of Florida by later tonight. Another Arctic air mass will push into the north-central US early this weekend and it’ll spread to the east coast later in the weekend. The frontal boundary zone at the leading edge of the weekend Arctic blast will act as a catalyst for waves of low pressure to form and one system can bring some snow to parts of the eastern US from later Friday night to Saturday and a second on Sunday. The second low pressure system can bring snow to unusual places in the southeastern part of the nation on Sunday, and its snow field may extend far enough to the north and west to have an impact in the DC-to-Philly-to-NYC corridor. Following the passage of the Sunday system, yet another Arctic air mass will drop south and east into the northern US on Sunday night, and it’ll put the Mid-Atlantic region and Northeast US into the deep freeze by time Monday night and Tuesday roll around. Looking ahead, numerous signs point to additional Arctic air outbreaks as we work through the last week of January and this time period could feature some extreme cold.
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An Arctic air mass has pushed into the Mid-Atlantic region on the heels of a strong cold frontal passage and temperatures have very likely already reached their highs for the day. The winds will be quite strong through the day from a west-to-northwest direction making it feel even colder than the actual ambient temperatures. It stays much colder-than-normal on Friday and then an upper-level disturbance will head in this direction on Friday night and Saturday potentially resulting in some snow and/or rain to the metro region. Another system will then try to slide up along the east coast on Sunday and it can bring some snow or snow shower activity to the area during the second half of the weekend. More Arctic air is on tap for the Mid-Atlantic during the early part of next week.
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The next couple of weeks are likely to feature multiple Arctic air outbreaks across the eastern half of the nation and even the state of Florida will be impacted (watch out iguanas). This kind of evolving pattern that features a major disruption of the polar vortex can certainly include some extreme cold during what is statistically speaking the coldest time of the year later in the month. This cold weather pattern will be quite active as well with multiple snow threats along the way for the Great Lakes, Midwest, Mid-Atlantic and Northeast US...and perhaps some snow this weekend in unusual places like the Southeast US.
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It’ll be relatively mild for another day on the front side of a cold front with afternoon temperatures likely climbing to the lower 50’s. As the cold front approaches, low pressure will form along its boundary zone and there will be some rain from later today into the overnight hours. As the colder air rushes in later tonight, the rain can mix with or change to snow for a brief time during the wee hours of Thursday morning. Watch out for slick spots late tonight/early Thursday given the combination of a brief period of snow and the rapidly falling temperatures. Temperatures on Thursday will struggle to climb above freezing and the teens are likely for overnight lows going into early Friday morning.
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It’ll turn slightly milder today with afternoon high temperatures near 50 degrees and it’ll stay mild on Wednesday as well ahead of the next cold frontal system. As the cold front approaches, low pressure will try to form along its boundary zone and there will likely be some rain from later tomorrow into late tomorrow night. As the colder air moves in late tomorrow night, the rain can mix with or change to snow before the precipitation ends early Thursday. The remainder of the week and weekend will feature some cold air and multiple disturbances can cause snow shower activity at times.
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After a couple of moderately cold days to start the week in the Mid-Atlantic region, it’ll turn milder on Wednesday ahead of the next cold frontal system. That mid-week cold front will usher in a colder air mass later this week, and it appears the overall weather pattern is setting up for multiple cold air outbreaks during the second half of January, and this will include the possibility of extreme cold.
In addition, the evolving weather pattern will likely be quite active as well featuring strong high pressure ridging near Alaska, high latitude blocking across northern Canada, and a large-scale and intense trough of low pressure centered over the eastern states. Multiple short-wave streams of energy will rotate through the large-scale trough, and each will have to be monitored to see if they can produce any appreciable snowfall in the Mid-Atlantic region.
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The week will start off with dry weather and moderately cold conditions following the passage of a cold front on Sunday and another cold frontal passage is expected on Wednesday. Ahead of the next cold front, it’ll turn milder on Wednesday and there can be some rain shower activity. After that, the weather pattern gets quite active across the eastern states and a storm system can develop in the colder air mass on Thursday bringing the chance of snow or rain changing to snow in the Mid-Atlantic region…lots of details remain to be ironed out.
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The next couple of days will feature some rainfall in the Mid-Atlantic region with showers likely later today/early tonight and then more widespread rain on Saturday. The showers later tonight and early tonight will be associated with a weakening frontal system and then low pressure lifts from the Great Lakes to southeastern Canada on Saturday bringing soaking rain to this area…some of the rain on Saturday can be heavy at times. It’ll be rather mild today with temperatures climbing into the 50’s, but then they’ll likely hold in the 40’s on Saturday, and it turns colder by later Sunday and Monday (and windy as well) after the passage of a cold front.
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Much warmer-than-normal air that originated over the Pacific Ocean has enveloped much of the nation this week and some of this will reach the northeastern states on Friday with high temperatures likely well up in the 50’s in many locations. It’ll turn out cooler on Saturday with a soaking rainfall, but still warmer-than-normal for this time of year. The milder weather will come to an end later this weekend with the passage of a strong cold front that’ll usher in colder and windy weather conditions for later Sunday into Monday.
By later next week, some important changes will begin to take place in the upper atmosphere across North America. First, an intense upper-level ridge of high pressure is likely to form near Alaska and the west coast of Canada replacing a trough of low pressure that has dominated that region in recent weeks. At the same time, an upper-level trough of low pressure will deepen over the eastern half of the US in response to a more active subtropical jet stream that has been largely missing in action in recent weeks. This combination will increase the chance for additional cold air intrusions into the US from Canada beginning later next week and can increase the chance for storms to develop across the southern and eastern states.
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