A major storm system this weekend is going to become a multi-hazard event for much of the eastern half of the nation. The storm will begin to unfold later Friday in the south-central US and then trek northeast to a position near the eastern Great Lakes by Saturday evening and then it’ll end up in New England by early Sunday. Heavy rain and severe weather is likely to take place on Saturday south and east of the storm system and significant snow and ice is likely to its north and west. The I-95 corridor region from DC-to-Philly-to-NYC will experience unusual warmth on Saturday afternoon (e.g., 65 degrees in DC) and then some rainfall and possible thunderstorms on Saturday night and Sunday.
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Low pressure is intensifying at this hour as it takes a path from the Tennessee Valley to the coastal waters of New Jersey and it will produce accumulating all along the I-95 corridor. Snow is closing in on the DC metro region and it should reach the Philly area during the mid-to-late afternoon hours and then into NYC by early tonight. While there can be rain mixed in at times in the initial stages of this event, the bulk of the precipitation in the DC-to-Philly-to-NYC corridor should be in the form of snow. General accumulations of 1-3 inches are expected from DC-to-Philly with isolated 4 inch amounts possible…slightly lesser snowfall totals are expected in NYC and Boston. Watch for slick road conditions this afternoon and tonight as the snow is likely to come down quite hard at times. In the wake of the storm, it’ll be cold and windy on Wednesday with gusts past 40 mph and snow showers and squalls are quite likely in much of the Mid-Atlantic region. The cold air mass that arrives in the wake of the storm will give way to a big warm up this weekend with the 60’s possible in the I-95 corridor.
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Low pressure will pull out of the Tennessee Valley early tomorrow and head towards the Mid-Atlantic coastal waters and the result is likely to be some accumulating PM snow in the DC-to-Philly-to-NYC corridor. Temperatures will be borderline in the I-95 corridor region in terms of snow versus rain on Tuesday, but odds favor snow in the metro regions and nearby suburbs or a changeover from a mix of rain and snow to all snow soon after the precipitation begins. The low will push away from coastal waters of New Jersey tomorrow night and another cold air outbreak will make it into the Mid-Atlantic region on Wednesday. Much like most recent cold air outbreaks, however, this chilly air mass will not last too long and it should give way to much milder conditions for the upcoming weekend and it’ll turn wet.
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A “clipper” system will throw some snow shower activity into the northern Mid-Atlantic region late tonight and there is the chance for some additional snow later Tuesday in the I-95 corridor region from DC-to-Philly-to-NYC. On Tuesday, low pressure will pull out of the Tennessee Valley and head towards the Mid-Atlantic coastline. Temperatures will be borderline in the I-95 corridor region in terms of snow versus rain on Tuesday, but odds favor mainly snow in the immediate I-95 corridor and to points north and west of there. The low will push off the Delmarva Peninsula coastline by later Tuesday night and another cold air outbreak will make it into the Mid-Atlantic region at mid-week. Much like most recent cold air outbreaks, however, this chilly air mass will give way to much milder conditions by the upcoming weekend.
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An active weather pattern will bring multiple waves of energy across the country and into the Mid-Atlantic/NE US during the next several days, but the lack of sustainable cold air is still problematic for snow lovers. A couple different waves of energy will consolidate in the Mid-Atlantic region on Saturday and bring more rain followed by windy and colder conditions for Saturday night and Sunday. A “clipper” low pressure system will then drop southeastward on Sunday from central Canada to the Great Lakes and it could throw some snow showers into at least parts of the interior Mid-Atlantic/NE US from late Sunday night into early Monday. Finally, another system - perhaps the one with the most potential for accumulating snow in the I-95 corridor - is likely to form on Tuesday over the Ohio Valley as additional waves of upper-level energy come together. This system should be able to produce some rain and/or snow in the Mid-Atlantic region by Tuesday night. Another cold air outbreak will follow for the middle of next week, but, once again, it won’t last too long.
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When Alaska is colder-than-normal this time of year, chances are that the central and eastern US are warmer-than-normal mainly due to the typical wintertime distance between upper-level troughs and ridges across the Northern Hemisphere. Indeed, record lows temperatures of around 55 degrees below zero have struck Alaska at the same time places like Chicago, IL enjoyed some of the warmest weather ever around the Christmas holiday. Some of the cold air that has been bottled up over Alaska and Siberia in recent days may make a push into the central and eastern US in ten days or so.
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The weather looks quite favorable this weekend for traveling purposes from the Mid-Atlantic to the Upper Midwest, but a major storm will impact Florida and the rest of the Southeast US. A slow-moving and deep upper-level low pressure system will spin from the south-central US to the northern Gulf of Mexico by later this weekend and the result will be a strong surface storm that will likely bring a widespread 2-3 inch rainfall to Florida and much of the Southeast US from Louisiana to the Carolinas.
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The low pressure system that resulted in a wintry mix of precipitation in the Mid-Atlantic/NE US over the past 24 hours or so will reach a position off the New England coastline by later today. This system will drag a cold front through the I-95 corridor by early tonight and winds will pick up as a moderately cold air mass moves into the area. Watch for icy spots later tonight as temperatures drop into the 20’s in most areas and there may still be some wet roadways. Another front will arrive in the I-95 corridor tomorrow afternoon and this front will represent the leading edge of an Arctic air mass. The arrival of the Arctic frontal system on Wednesday afternoon will be accompanied by strong wind gusts, scattered snow showers, and perhaps an isolated snow squall or two. It’ll stay windy tomorrow night and on Thursday and it’ll turn sharply colder with some of the lowest wind chill values and temperatures of the season so far in the Mid-Atlantic/NE US.
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One storm system continues to impact the Mid-Atlantic/NE US today and another one will impact the same area from Monday into Tuesday. The next storm will intensify over the Lower Mississippi Valley early Monday and it will take a track to the Mid-Atlantic coastline by Tuesday afternoon. As the storm intensifies on Monday, it will generate a west-to-east swath of precipitation that will push into the Mid-Atlantic region during the morning or mid-day hours on Monday. The air is likely to be cold enough for a period of snow and/or ice at the onset and there are likely to be some accumulations before any changeover to rain; especially, from the northern and western suburbs of DC to areas near and north of the PA/MD border.
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There will be two storms to deal with in the Mid-Atlantic/NE US over the next few days with the first storm already impacting parts of the Mid-Atlantic region and another storm will impact the same area from Monday into Tuesday. The initial storm is going to be predominately a ‘plain’ rain event in the I-95 corridor and some of it will become heavy at times, but there are a few pockets of freezing rain at this hour in areas well to the north and west of Route I-95. Patchy fog may form as well in the overnight hours as the in flux of milder air moves over still cold grounds. The departure of this initial storm will result in an influx of another cold air mass at the end of the weekend and this could set the stage for some snow and/or ice on Monday at the onset of the next storm; especially, in areas north of the PA/MD border.
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