A new month, a new year, and a new weather pattern that has resulted in overnight snow in parts of the Mid-Atlantic region and it’ll be a cold start to the week here with some snow developing and temperatures confined to the 30’s. The snow will accumulate more to the south and east in this storm and less or not at all to the north and west. Specifically, accumulations of 1-3 inches are possible later today in Philly and nearby areas with little to no snow likely in the far northwest suburbs. The Jersey Shore region from Atlantic City-to-Cape May can get pounded by this storm with 6-10 inches likely down there. Low pressure will push away from the Mid-Atlantic coastline later this morning and high pressure will take control of the weather for tonight and Tuesday. It’ll turn milder for a brief time at mid-week as high pressure pushes off the coast, but another cold front will usher in colder air for the late week time period. By Thursday night and Friday, we’ll have to watch as low pressure tries to intensify near the Mid-Atlantic coastline and it could produce some accumulating snow in the region.
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The month of December ended with well above normal temperatures throughout the Mid-Atlantic region and the big cities of DC, Philly and NYC had no measurable snow. The new month and new year has coincided with a pattern change in the atmosphere that will bring winter weather to the eastern states including the strong likelihood for significant accumulating snow in parts of the Mid-Atlantic region with a focus on the zone from DC-to-Delmarva-to-southern New Jersey. A second winter storm is possible late this week that could result in more accumulating snow for the Mid-Atlantic region on Thursday night and Friday.
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Low pressure will track nearby today along a nearly stationary frontal boundary zone bringing us more clouds and perhaps a touch of rain at times. Weak high pressure will try to bring some drying on Friday, but more rain will follow later Friday night and Saturday from strong low pressure that will push to our northwest. In addition to the rain on Saturday, New Year’s Day, it’ll be unseasonably mild for the 1st day of January and afternoon highs could be near the 60 degree mark. After another mild and damp day on Sunday, sharply colder air will push into the region by Monday following the passage of a strong cold frontal system. This cold blast may arrive with a low pressure system on Sunday night and Monday which could produce some snow in the Mid-Atlantic region…something to monitor in coming days.
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Low pressure will bring us more rain over the next couple of days and then weak high pressure will try to dry it out some on Friday…the last day of 2021. Strong low pressure will then impact the area on Saturday, New Year’s Day, producing very mild conditions around here and additional rainfall. After another mild and damp day on Sunday, sharply colder air will push into the region on Monday following the passage of a strong cold front.
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An active weather pattern will continue through the week across much of the nation. Multiple low pressure systems will form in a boundary zone region between very cold air sitting across the northwestern states/southwestern Canada and very mild air draped across much of the southern US. The next in a series of low pressure systems will generate some rain around here later this evening and then another one later tomorrow into early Thursday. A stronger storm early this New Year’s Day weekend could have a big impact on a large part of the nation with mild, rainy conditions likely around here, a possible severe weather outbreak in the Tennessee/Mississippi Valleys, and accumulating snow in the Upper Midwest. A second storm could follow from later Sunday into Monday and - given the potential of colder air filtering into the Mid-Atlantic from the northwest - it is a threat that needs to be monitored in coming days.
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An active weather pattern will continue across much of the nation during the next few days and indeed it is likely to last right through the upcoming New Year’s Day weekend. A huge difference in temperatures currently exists across the country from northwest-to-southeast and it is helping to fuel this activity with multiple low pressure systems to deal with as we head into the new year. A strong storm system on Saturday could have wide-ranging impacts from rainy, unusually mild conditions in much of the eastern US, severe weather in the Lower Mississippi and Tennessee Valleys, and accumulating snow from Colorado to Michigan. There is a chance that a follow-up storm takes place at the end of the weekend in the eastern US as sharply colder air pushes in from the northwest….something to monitor closely in coming days.
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“Red sky in the morning…sailors warning”. The overall weather pattern for the final week of the year will be quite active with multiple systems impacting the region. The week begins with red skies this morning and indeed this is a warning that some wintry precipitation is coming later today as low pressure approaches the Mid-Atlantic region. Additional low pressure systems will come our way for the mid and late week time periods bringing some rain shower activity. The weekend could feature a much stronger low pressure system in the eastern US sandwiched between warmer air to the south and east and colder air to the north and west.
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High pressure will move overhead today and this will cause a relaxation of the winds that buffeted the region on Wednesday. A fast-moving low pressure system will pass by to our north later tonight and it could generate a few snow showers in the overnight hours. Another low pressure system will approach the region on Friday night and it is likely to generate some rain shower activity on Christmas Eve and Christmas Day. Yet another low pressure system could arrive here early next week with the chance for rain or snow showers on Monday.
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Low pressure will strengthen off the east coast today and the pressure gradient between the departing low and a building high pressure system to our west will intensify resulting in increasing NW winds around here as the day progresses. It stays quite breezy tonight and Thursday will be a seasonably chilly day with high pressure in control. Low pressure will pass by to our north on Thursday night and it could generate a few snow showers across Pennsylvania. Another system can bring some rain showers here on Christmas Day (Saturday).
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Low pressure will head up along the southeast US coastline today and its impact will largely be limited to areas to the south and east of the immediate I-95 corridor. Coastal sections of New Jersey and the Delmarva Peninsula could get a bit of rain out of this system later tonight and a late night rain, sleet or snow shower cannot be ruled out around here.. On the backside of the departing low pressure, winds on Wednesday will pick up in intensity out of the NW as another chilly air mass pushes into the region from the Great Lakes region. Fast-moving low pressure will cross the Northeast US on Thursday night and it could produce some rain and/or snow shower activity across parts of Pennsylvania.
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