A moderately cold air mass has moved into the Mid-Atlantic region following the passage of a cold frontal system and now attention has turned to the Gulf of Mexico and the southeastern states where moisture is gathering. A storm will develop near the South Carolina coastline by early tonight and move to a position off the New Jersey coastline by mid-day Sunday. This system is going to generate a new round of accumulating snow in the DC-to-Philly-to-NYC corridor from late tonight into the mid-day or early afternoon hours on Sunday with several inches on the table for many spots. Looking ahead, the active weather pattern of recent days will continue beyond tomorrow’s storm with additional chances of snow and/or ice coming to the Mid-Atlantic from around mid-week into next weekend.
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Moderate cold air will follow the passage of a cold front for the upcoming weekend and attention will turn to the Gulf of Mexico and the southeastern states where a lot of moisture will be gathering. A storm will develop near the South Carolina coastline by early Saturday night and move to a position off the New Jersey coastline by mid-day Sunday. This system is likely to bring another round of accumulating snow to the DC-to-Philly-to-NYC corridor from later Saturday night into Sunday morning with several inches on the table. Looking ahead, very cold air will pour into the interior Northwest, Northern Plains, Upper Midwest and Great Lakes next week and the overall active weather pattern will bring additional snow threats to the Mid-Atlantic region.
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A strong cold front will approach the region today with a wintry mess of snow, sleet and rain early this morning that can even include a burst of heavier snow in some spots and quick small accumulations. It’ll turn breezy and milder by the mid-day and afternoon with partly sunny skies and temperatures are likely to reach the middle 40’s for highs. Moderate cold air will follow the cold frontal passage for the upcoming weekend and attention will turn to the Gulf of Mexico and Southeast US where a lot of moisture will be gathering. A storm will develop in the southeastern states by early Saturday night and it is likely to impact us here later this weekend. The most likely impact time for this quick-moving storm will be from late Saturday night into mid-day Sunday with snow that can mix with or change to rain briefly before the precipitation ends on Sunday. Snow accumulations of several inches are on the table for the late weekend storm.
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Low pressure is impacting the Upper Midwest today with accumulating snow from Iowa to Wisconsin and it’ll push into the southeastern part of Canada by later tomorrow. A trailing strong cold front will slide into the eastern US on Friday and there can be a wintry mess of snow, sleet and/or freezing rain ahead of it in some suburban locations of the I-95 corridor from late tonight into early Friday. By later Friday, it’ll turn mild enough for just plain rain showers in the DC-to-Philly-to-NYC corridor and temperatures will likely climb into the 40’s.
Moderate cold air will follow the cold frontal passage for the upcoming weekend and attention will turn to the Gulf of Mexico and Southeast US where a lot of moisture will be gathering. A storm will develop in the southeastern states by early Saturday night and - depending on the interaction of two separate waves of energy aloft - it could end up pushing far enough to the north and east to have an impact the Mid-Atlantic region with accumulating snow - perhaps mixed with rain at times - from late Saturday night into mid-day Sunday. Looking ahead, very cold air will pour into the interior Northwest, Northern Plains, Upper Midwest and Great Lakes early next week and it looks like it will then spread to the Mid-Atlantic region at mid-week - potentially setting us up for an extended period of colder-than-normal conditions…and likely additional snow threats.
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High pressure will be the main player today in the Mid-Atlantic region generating plenty of sunshine which will be quite a change from recent days. Clouds will increase tonight as a strong cold front pushes towards the eastern states. This front will arrive on Friday with snow and/or rain showers and it'll turn a bit milder ahead of it with temperatures likely reaching the 40's for highs. It turns a bit colder this weekend following the passage of the cold frontal system and attention will turn to a storm system over the Southeast US. There continues to be a chance that northern and southern stream energy "phase together" in time for this system to push far enough to the north and east to have an impact on the Mid-Atlantic region.. If so, there would likely be snow or a combination of snow and rain in the Saturday night/Sunday time frame...stay tuned.
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The winter storm that has impacted us since the late weekend is still able to generate snow showers in the Mid-Atlantic region and it won't relinquish control of our weather until tonight. Temperatures today will struggle to reach the mid 30's for highs, but we'll be closer to 40 degrees on Thursday and then climb into the lower 40's on Friday as a cold frontal system approaches. That next front can cause snow and/or rain showers here later tomorrow night and on Friday and then it'll turn colder again this weekend following the passage of the cold front.
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The long-duration major winter storm that has impacted the NYC region since Sunday will continue to produce occasional snow or snow showers in the area into tonight and winds will remain quite strong. This occasional snow can result in additional small accumulations for the region adding on to the prior very hefty two-day totals. High pressure will edge into the region on Wednesday and it’ll stick around on Thursday. A frontal system will cross the area on Friday and it could generate some rain and snow showers in the Mid-Atlantic region. One final note, Phil sees his shadow…6 more weeks of winter...very smart rodent.
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Low pressure continues to deepen off the Mid-Atlantic coastline and it will continue to have a major impact on the northern Mid-Atlantic through tonight in the area from eastern PA-to-New Jersey-to-southeastern New York. Mixed precipitation this morning has changed to snow in most places as colder air wraps into the system from the north/northeast. There will continue to be small-scale bands of very heavy snowfall from later today through tonight and many spots will end up with 1-2 feet of accumulation from this long duration storm system by the time it winds down later Tuesday.
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Low pressure will intensify off the Mid-Atlantic coastline today and push very slowly to the north as it encounters a blocking pattern in the atmosphere. The brunt of this winter storm will take place from later today into tonight as heavier rounds of precipitation work their way across southeastern New York and New Jersey and the winds will pick up in intensity as well. Any mixed precipitation this morning should change back to all snow by mid-morning as colder air wraps around the intensifying storm off the Mid-Atlantic coastline and significant additional accumulations are likely. Given very strong dynamics in the upper atmosphere, there is the potential for “mesoscale” or small-scale banding later today and tonight containing brief outbursts of very heavy snow and possible rumbles of thunder. Total snow accumulations from this storm by later tomorrow can surpass a foot and a half in the NYC metro region.
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A major and complex storm system is coming to the Mid-Atlantic region and it will be a long duration event with impact into Tuesday. Indeed, this storm could turn out to be one of the all-time greats for some sections of eastern PA, upstate New Jersey, and southeastern New York. The storm will come in two phases with the first part already underway and associated with a process known as “overrunning”. The second phase of this major winter storm event will feature a very slow moving and powerful storm just off the Mid-Atlantic coastline.
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