Arctic air plunged into the Mid-Atlantic region late yesterday and temperatures today are well below-normal in DC, Philly and NYC. Meanwhile, a “clipper” low pressure system is dropping southeastward across the Upper Midwest and it should reach southwestern Pennsylvania by later tonight. As a result, snow is likely to break out later tonight in much of the Mid-Atlantic region; primarily, in areas to the north of the Mason-Dixon Line, but even the DC metro region can see some snow shower activity. Any snow that falls with this “clipper” system can quickly cause slippery conditions on untreated roadways given the very cold surface temperatures. Looking ahead to later this month, there are signals for continued cold air outbreaks into the eastern US – perhaps after a temporary milder stretch early next week – and the pattern may become quite stormy as well.
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An Arctic air mass has plunged into the Mid-Atlantic region and today will be very windy and cold for the middle of December. Temperatures will struggle to reach the freezing mark and wind chill values will be considerably lower given the NW wind gusts up to 40 mph. A "clipper" low pressure system will drop southeastward across the northern Ohio Valley today and move across Pennsylvania late tonight and early tomorrow. As a result, snow is likely to break out around here after midnight and continue into early tomorrow with small accumulations of a dusting to an inch or so. Slippery roads are likely late tonight and early tomorrow despite receiving only minor accumulations. Surface-level conditions are very cold right now in this Arctic air mass - unlike the overall setup experienced this past weekend with our first snowfall. Therefore, untreated roads could get slippery in a hurry with any snow that falls. The late week threat for snow has decreased as it appears that the next couple of waves of energy in the northern branch of the jet stream will likely not consolidate in time to produce snow around here.
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An Arctic blast arrives later today with possible snow showers and perhaps even a heavier snow squall. Temperatures on Wednesday will have a hard time passing the 30 degree mark in the DC-to-Philly-to-NYC corridor and strong NW wind gusts to 40 mph will generate considerably lower wind chill values. Low pressure will form in the Ohio Valley later Wednesday as the next in a series of upper-level energy features drop southeastward in the very active northern branch of the jet stream. Snow from this low pressure system may push into our region late tomorrow night and continue into early Thursday. In fact, there can be some road problems during the Thursday AM commute caused by very cold conditions and the potential small snow accumulations. More upper-level energy in the northern branch of the jet stream will try to consolidate near the Mid-Atlantic coastline late in the week and, if successful, there could be more snow around here by Friday night or Saturday.
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The biggest weather story of the week in the Mid-Atlantic region is likely to be the bitter cold coming at mid-week because of its unusual nature for this time of year; however, there are also multiple waves of energy in the northern branch of the jet stream that can cause snow on numerous occasions during the upcoming five days or so. The first upper-level system to monitor is likely to generate some snow and/or rain shower activity in parts of the Mid-Atlantic region and there can be some snow squall activity as very cold air pours into the region later tomorrow into tomorrow night. After a very windy and cold day on Wednesday, a second wave of energy will drop southeast towards the Mid-Atlantic region on Thursday and it could generate some accumulating snow in a very cold air mass. Another snow threat will come late Friday into Saturday as a couple of waves of upper-level energy try to consolidate near the Mid-Atlantic coastline and the result could be some more snow for the I-95 corridor region from DC-to-Philly-to-NYC.
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A significant cold air outbreak is headed to the Mid-Atlantic region and will result in mid-week temperatures that will struggle to reach the 30 degree mark. In addition, winds will be strong out of the NW on Wednesday with gusts to 30 mph generating even lower wind chill values. Before this next Arctic blast arrives, there may be some rain and snow shower activity to deal with from late tonight into tomorrow night and sleet can be mixed in as well at times. Some snow is possible later in the week as additional upper-level energy drops into the eastern US from the Northern Plains. One final note, the official snow total at Central Park on Saturday was 4.6 inches from the first accumulating snow event of the season.
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If you had December 9th in your snow pool, you're looking pretty good right about now. Low pressure will push out of the eastern Gulf region later today and head to a position off the Mid-Atlantic coastline by later tomorrow and the big cities from DC-to-Philly-to-NYC will receive their first accumulating snowfall of the winter season. Snow fell this morning from this same storm system across many southern areas (e.g., Texas, Louisiana) that are not used to seeing much snow; especially, this early in the season.
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If you had December 9th in your snow pool, you're looking pretty good right about now. Low pressure will push out of the eastern Gulf region later today and head to a position off the Mid-Atlantic coastline by later tomorrow and the big cities from DC-to-Philly-to-NYC will receive their first accumulating snowfall of the winter season. Accumulations on the order of 2-4 inches are likely from late tonight into late tomorrow in and around the big cities with 3-6 inches possible across interior sections of central and southern New Jersey. Residual snow showers are possible early tomorrow night as an upper-level low pushes by just to our north. It stays cold on Sunday and Monday and then the next shot for snow or snow showers will come on Tuesday as a significant cold air outbreak heads towards the Mid-Atlantic region. Temperatures at mid-week will struggle to reach the 30 degree mark for highs following that next snow threat.
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Now that the (sustained) colder pattern has set up in the Mid-Atlantic region, it is time to focus on the threat for snow and indeed there are multiple chances over the next several days. The first legitimate chance for accumulating snow in the immediate I-95 corridor will come late Friday night and Saturday as low pressure pushes from the Southeast US to a position off the Mid-Atlantic coastline. A second shot will come Saturday night/early Sunday as deep upper-level low passes by just to our north. Finally, as a significant cold air outbreak arrives late Tuesday into early Wednesday, low pressure may try to form over the Northeast US and it could generate some snow for parts of the Mid-Atlantic. Following the passage of that low pressure system and its associated strong cold front, very cold air will flood into the region at mid-week.
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Now that the (sustained) colder pattern has set up in the Mid-Atlantic region, it is time to focus on the threat for snow and indeed there are multiple chances over the next several days. The first legitimate chance for snow in the immediate I-95 corridor will come late Friday night and Saturday as low pressure pushes from the Southeast US to a position off the Mid-Atlantic coastline. A second shot will come Saturday night/early Sunday as deep upper-level low passes by just to our north. Finally, as a significant cold air outbreak arrives late Tuesday into early Wednesday, low pressure may try to form over the Northeast US and it could generate some snow for parts of the Mid-Atlantic. Following the passage of that low pressure system and its associated strong cold front, very cold air will flood into the region at mid-week.
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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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