It’ll start off on the chilly side this morning, but we should climb into the 50's this afternoon and then likely reach the 60 degree mark for highs on Tuesday. Following a cold frontal passage, we'll turn moderately cold again on Wednesday and Thursday only to turn milder again by the early part of the weekend. Unfortunately, the milder conditions at the end of the week and beginning of the weekend are likely to be accompanied by some rainfall.
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This is going to be the third accumulating snow even this week in parts of the I-95 corridor which is pretty impressive for any time of the winter season, but particularly notable for the first half of December. Low pressure will intensify off the Mid-Atlantic coastline this afternoon and snow is now breaking out in many areas in this entrenched cold air mass. Given the very cold ground-level conditions, slippery spots are very likely to form rather quickly this afternoon on many roadways and average accumulations of a dusting to a couple of inches are likely in along the I-95 corridor with even higher amounts at the NJ coastline and in isolated spots around here.
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Earlier in the week, it looked like we had a real threat for more accumulating snow at the end of the work week. Then the chances seemingly diminished at mid-week as it appeared a couple waves of energy would not consolidate in time to have an impact on the local region. Now, the threat is back on and indeed it looks like low pressure will form quickly enough near the Mid-Atlantic coastline later today to generate accumulating snow in our area; especially, across the eastern and northern suburbs. Snow should break out this afternoon and continue into the evening rush hour which can feature some slippery spots. Accumulations on the order of a dusting to a couple of inches are likely by the time the the snow ends early tonight with lesser amounts to the west of DC. Roads could get slippery in a hurry given the very cold ground-level conditions. After a cold day on Saturday, a milder stretch of weather will finally arrive for Sunday, Monday and Tuesday.
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The “clipper” low pressure system has pulled off the New Jersey coastline and there should be some sunshine around here today with temperatures climbing to above-freezing levels, but snow flurries are possible during the mid-day and afternoon hours. It'll turn quite cold again tonight with overnight lows in the lower 20's as skies remain mainly cloudy. Another low pressure system will try to form along the Mid-Atlantic coastline later tomorrow and we'll have to see if it can strengthen in time to impact the region. High pressure will return to the Mid-Atlantic region for the upcoming weekend.
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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 get above the freezing mark and wind chill values will be considerably lower given the NW wind gusts up to 35 mph. A "clipper" low pressure system will drop southeastward across the northern Ohio Valley today and move to our north by late tonight and early tomorrow. As a result, most of its snow will stay to our north - near and north of the Mason-Dixon Line - but a few snow showers cannot be ruled out around here later tonight into early Thursday and a dusting is possible with some slippery spots.. 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 reaching 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 is likely to push into our region late tomorrow night and continue into early Thursday. There can be some road problems during the Thursday AM commute caused by very cold conditions and potential 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, but most of the precipitation from this approaching upper-level system will stay to our north. 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 airport snow totals on Saturday was 4.0 inches at Dulles (IAD) and 2.0 inches at Reagan National (DCA) 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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