Much colder air has moved into the Mid-Atlantic region following the passage of a cold frontal system on Wednesday. Meanwhile, another cold front is headed towards the east coast and this will be supported by vigorous upper-level energy. As a result, low pressure is likely to form on Thursday just off the New Jersey coastline and then rapidly intensify as it moves northeastward reaching Maine’s east coast as a powerful storm by early Friday morning. This storm will become a major snow producer for interior sections of New England by tomorrow night where more than a foot can pile up in portions of (inland) Maine, Vermont and New Hampshire – coastal New England will receive far less (e.g., 1-3 inches around Boston).
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A cold front crossed the region yesterday and noticeably colder air has pushed into the region. Another cold front will slide into the I-95 corridor by early tomorrow and this could set the stage for some snow in the Mid-Atlantic region; primarily, north of the PA Turnpike. Low pressure will form along the cold front on Thursday, intensify rapidly, and ultimately become a major snow producer for much of interior New England where a foot or more could fall in portions of Maine, New Hampshire and Vermont. Snow or a wintry mix could break out around here early tomorrow and small accumulations are even possible in the far northern and western suburbs before a changeover takes place to primarily rain. A few inches of snow are likely in the Poconos from tomorrow's system. Following the departure of the storm, winds will pick up out of the northwest on Friday, it’ll turn even colder and flurries are likely - perhaps even a heavier snow shower.
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Temperatures today are well above normal in the Mid-Atlantic region, but a cold frontal passage will usher in noticeably colder air for tonight and Wednesday. Another surface cold front will arrive in the I-95 corridor on Thursday supported by vigorous upper-level energy and this will set the stage for a rapidly intensifying low pressure to form along the Northeast US coastline. This system is likely to generate some snow in portions of the Mid-Atlantic region (north of the Mason-Dixon Line) and ultimately, lead to a major snowstorm for much of New England. Following the departure of the Thursday storm, quite cold air will flood the region on Friday riding in on strong NW winds and there can be some snow shower activity in the I-95 corridor from Philly-to-NYC. In the longer term, there will likely be another warm up in the Mid-Atlantic region early next week; however, signs are growing for widespread cold to develop across most of the US as we progress towards the second week of January.
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A cold front will cross the region this morning and skies should clear somewhat during the afternoon hours following its passage allowing for the return of some sunshine. It’ll turn noticeably colder tonight and Wednesday and then another cold front will approach the I-95 corridor by early Thursday and this could set the stage for some snow; especially, to the N and W of the metro region. Low pressure will form along the cold front on Thursday, intensify rapidly, and ultimately become a major snow storm for much of New England. Snow could break out around here by early Thursday and small accumulations are possible across interior NJ and in the N and W suburbs of NYC. Following the departure of the storm on Friday, winds will pick up out of the northwest, it’ll turn even colder, and snow showers could reach the immediate I-95 corridor all the way from the Great Lakes.
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A cold front will cross the region late today and it is likely to come through on the dry side. High pressure then returns to the area to close out the work week and it’ll turn a bit colder on Friday following the cold frontal passage. Another front pushes into the region on Saturday and it will likely generate occasional rain during the daytime hours; primarily, before noon. Christmas Day (Sunday) will feature the return of sunshine as high pressure builds in from the north. Looking ahead, a cold shot at the end of next week is destined to make it quite cold as we begin the new year.
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High pressure will remain in control of our weather pattern for another day and it’ll turn a bit milder here at the mid-week point. A cold front will cross the region late tomorrow, but it is likely to generate just a couple of isolated rain showers in the Mid-Atlantic region. High pressure then returns to the area to close out the work week, but another cold frontal system should bring showers on Saturday that will likely move out of here by Saturday night (Christmas Eve). High pressure builds to our north on Sunday, Christmas Day, bringing us a return of partial sunshine with afternoon temperatures generally holding in the 40's. Looking ahead, a milder pattern will set up as we heads towards the new year, but it is very likely going to be just a temporary break in the cold.
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High pressure will remain in control of our weather pattern for the next couple of days and we’ll turn a bit milder on Wednesday following colder-than-normal conditions today. A cold front will cross the region late Thursday and it could generate a few rain showers, but no significant precipitation is expected from this system. High pressure returns to the area to close out the work week and begin the holiday weekend.
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Another Arctic front pushed through the region late yesterday, and it’ll be much colder again to start off the new work week. The coldest core of this Arctic air outbreak will stay over the Upper Midwest; however, and we should not get quite as cold as during the last one. Another cold front heads our way later this week and it could generate rain showers in the area on Thursday and Thursday night.
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Arctic air is firmly entrenched in the Mid-Atlantic region and moisture is headed our way – not a good combination. Mid-day temperatures at the big cities of DC, Philly and NYC are holding in the low-to-mid 20’s, clouds are beginning to thicken, and dew points are hanging near zero. The extreme dryness of this air mass as indicated by those very low dew points is one sign that this is indeed true Arctic air from the Northern Canadian tundra region. The cold, dense Arctic air will grudgingly retreat to the north later tonight and early Saturday, but not before moisture arrives in the Mid-Atlantic region. The result will be snow and ice problems for about a twelve hour period from midnight-to-noon. After that, temperatures will likely climb into the 40’s on Saturday afternoon, perhaps even to 50+ degrees on Sunday, but then another Arctic air mass will filter in late Sunday and the beginning of next week will be quite cold.
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Those howling Arctic winds of yesterday will calm down later today as strong high pressure moves right over of the Mid-Atlantic region. With the high pressure moving right above us, the pressure gradient will relax and this, in turn, will lead to diminishing winds. This bitter cold, dense Arctic air mass will begin to retreat to the north this evening as the high pressure system shifts off the coast. Moisture will arrive here tonight before the Arctic air has a chance to fully retreat; consequently, snow is likely to break out at or shortly after midnight and continue overnight. Accumulations of an inch or two are possible here by daybreak and then the snow will transition to a period of sleet and/or freezing rain during the mid-morning and ultimately to all (plain) rain by mid-day or early afternoon. Another 1-2 inches of snow can accumulate in the morning before the changeover resulting in a total snowfall estimate of 2-4 inches during this event with the higher amounts in that range in the northern and western suburbs of NYC. Temperatures will actually climb into the 40’s during the afternoon hours on Saturday and there is likely to be some more rainfall, but it should then slacken off for awhile tomorrow evening. Another round of rain is going to return for Sunday as low pressure forms along the next Arctic frontal system which will be approaching us from the Midwest. It is possible that the rain changes to sleet and/or snow for a brief time early Sunday night as the next Arctic air mass filters into the region with the best chance for that changeover in the northern and western suburbs. Following the passage of this next Arctic frontal system, the beginning of next week promises to very cold for the middle of December. Longer term, there are signs for a warmer weather pattern again as we get to the latter part of December and early part of January.
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