After the unusually cold weekend in the Mid-Atlantic region that included some snowfall, temperatures will moderate noticeably today, but with the milder conditions will come with the threat for showers. The threat for showers will continue tonight and Tuesday as a cold front slowly works its way through the region. High pressure will try to build in from the north for the middle part of the week and Wednesday and Thursday should be dry – and no snow is in sight.
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This could very well be the end game of the 2015-2016 winter season in the Mid-Atlantic region (FINALLY!) and it is looking more and more like it will be quite a remarkable finish; especially, in areas north of the PA/MD border. Another Arctic air mass will move into the Mid-Atlantic region this weekend and this one will be accompanied by accumulating snow in areas north of the PA/MD border with several inches possible in some of the higher elevation locations (e.g., Poconos). In addition to the cold and accumulating snow, winds will become a factor on Saturday and pick up dramatically as the day progresses. An increasing concern has to be the potential for power outages north of the PA/MD border given the possible combination of strong winds, heavy wet snow, and trees now with budding leaves. After this storm departs, temperatures will drop sharply - perhaps to record levels for so late in the season - with lows by early Sunday morning in the 20’s in most areas (map below).
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Another Arctic blast is headed to the Mid-Atlantic region for the weekend and there will be a strengthening “clipper” low pressure system pushing eastward from the Ohio Valley towards the east coast. As a result, clouds will thicken up tonight and snow showers could break out early on Saturday. Periods of snow are likely on Saturday mixed with rain at times and then precipitation should become all snow early tomorrow night. Winds will pick up late in the day on Saturday and then could gust past 40 mph tomorrow night. Snow accumulations of a "coating to 2 inches" are possible by late tomorrow night; primarily, on grassy and other non-paved surfaces. The greatest chance for those higher amounts in that range will be in higher elevation locations to the north and west of the NYC metro region. Another widespread deep freeze is likely to occur throughout the area by early Sunday morning with overnight lows temperatures down in the 20’s. It turns milder again early next week, but the threat for showers will also return.
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Another Arctic air mass will move into the Mid-Atlantic region this weekend and this one will be accompanied by an accumulating snow threat primarily for areas to the north of the PA/MD border. A strong upper-level wave of energy will spin off a “clipper” type of low pressure system that is likely to trek from west-to-east across Pennsylvania on Saturday. The highest precipitation amounts are likely to fall “along and to the north” of this expected storm track which will give the greatest chance for accumulating snow in the New York City metro region and the least likely chance to the south across DC - Philly falls somewhere in the middle. Behind the “clipper", very cold air will pour in on increasingly strong winds during late Saturday and another widespread deep freeze is likely throughout the region by early Sunday morning.
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It’ll turn noticeably milder today ahead of the next blast of Arctic air, but the mild weather will come at a price. There will be periods of rain developing today by noon and lasting into tonight – perhaps a thunderstorm or two – and some of the rain can come down hard at times. Colder air will push into the Mid-Atlantic region on Friday and the temperatures will remain well below normal this weekend with another widespread freeze possible again by Sunday morning. In addition to upcoming cold, there will be lots of upper level energy hanging back in this next cold air mass and low pressure is likely to form near the Mid-Atlantic coastline on Saturday. Some snow is likely on Saturday in the I-95 corridor - possibly mixed with rain at times - with accumulations possible of up to a couple of inches; especially, on grassy surfaces to the north and west of the metro region.
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Low temperature records were broken this morning in parts of the Mid-Atlantic region and Northeast US (e.g., Dulles and BWI Airports bottomed out at 24 degrees) and this is by no means the end of the unusual cold weather. Temperatures will modify some this afternoon and turn much milder on Thursday, but more Arctic air is poised to pounce on the region by the weekend and freezing conditions are quite likely in parts of the Mid-Atlantic on both weekend mornings. In addition to the upcoming late week and weekend cold, accumulating snow is a threat as a very energetic upper-level pattern develops in the Northeast US. Waves of energy will rotate around a deep upper-level trough of low pressure at the end of the week and the result could be a storm near the Mid-Atlantic coastline by Saturday. Tomorrow’s noticeably milder weather will come at a price as there will be periods of rain – perhaps a thunderstorm or two – and some of the rain can come down hard at times.
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Widespread record or near record cold this morning in much of the Mid-Atlantic region and Northeast US with, for example, lows of 20 degrees in Allentown, PA, 24 degrees at BWI and Dulles Airports (both records) and the upper teens in the Pine Barrens of New Jersey. After a very cold start to the day, there will be some modification in temperatures this afternoon, but that will not be the end of the cold weather. Even though it turns even milder on Thursday to go along with occasional showers and a possible thunderstorm or two, more Arctic air will arrive by Friday and the end of the week and weekend will be well below normal for this time of year. In fact, low temperatures on Sunday morning could be as cold as they were this morning across the Mid-Atlantic region. In addition to the late week and weekend cold, there will be lots of upper level energy hanging back in the cold air mass and we’ll have to watch for the possibility of some snow or snow shower activity on Saturday.
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April can be a cruel month. The 1 PM temperature at Philly Intl Airport was only 41 degrees despite full sunshine and northerly winds were gusting to 28 mph. This is very impressive cold for April 5th in Philly which has a normal high temperature of 60 degrees. This most recent of Arctic air outbreaks has indeed wreaked havoc on several baseball openers and has generated some remarkable low temperatures in the Northeast US and Upper Midwest with, for example, Marquette, Michigan dropping to -7°F and Syracuse, New York to 9°F – second coldest ever recorded in both places for so late in the year. A hard freeze is very likely in the overnight hours throughout the I-95 corridor with an extended period likely of below-freezing temperatures. Temperatures will modify on Wednesday afternoon after a cold start to the day, and it’ll turn milder on Thursday with occasional showers and possible thunderstorms, but yet another Arctic blast is destined to arrive for Friday and Saturday in the eastern US. In addition, an energetic upper-level pattern could result in some snow or snow shower activity on Saturday in the Mid-Atlantic region.
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It is much more like February this morning than April with near freezing temperatures and much lower wind chills. Another Arctic blast has arrived in the Mid-Atlantic region and temperatures today will hold in the 40’s - well below normal for this time of year (normal high at Central Park is 56 degrees). A hard freeze is quite likely late tonight throughout the metro region as temperatures will likely fall below freezing for a several hour period. Yet another Arctic blast arrives late this week and it should be preceded by more rainfall in the I-95 corridor on Thursday. Beyond that, there will be a lots of upper level energy hanging back in the atmosphere after the cold air becomes well established in the Mid-Atlantic region and we'll have to watch for potential mischief by early in the weekend.
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An active pattern continues this week with another strong Arctic frontal system headed our way for the overnight hours. After a cold start to the day and some rain/snow shower activity, it’ll turn milder ahead of this next cold front with temperatures climbing into the 50’s during the afternoon to go along with rain showers and maybe a thunderstorm or two. Winds will pick up later tonight as the next Arctic air mass arrives and there will be a plunge in temperatures after midnight with several hours of below freezing conditions and lows in the mid 20’s. Another hard freeze is likely tomorrow night with lows once again dropping to the 20’s for a several hour period after midnight. Yet another Arctic blast arrives late this week and it will likely be preceded by a complex low pressure system and more rainfall in the I-95 corridor.
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