High pressure will push away from the area today and a “clipper” low pressure system will head this way from the Great Lakes. This “clipper” system is likely to generate some snow in the area late tonight into early tomorrow then primarily rain for the rest of Saturday and then a return of more snow tomorrow night. There can be a coating to an inch or so of snow by mid-day tomorrow and then another 1-3 inches is possible tomorrow night as the "clipper" intensifies off the Mid-Atlantic coastline. High pressure will return for the early part of next week and it'll turn milder, but then another cold blast arrives for the mid-week.
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Winter will not go away easily. After another cold, dry day on Friday, attention will turn to the next system that could bring some snow to parts of the Mid-Atlantic region between tomorrow night and early Sunday morning. Beyond that, there will be some modifications in temperatures during the early part of next week, but then another significantly colder-than-normal air mass reaches us by the middle of next week.
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High pressure will build into the region over the next 24 hours, but the wind remains a factor today and it’ll stay cold as well. A “clipper” low pressure system drops southeastward across the Great Lakes later Friday and intensifies off the Mid-Atlantic coastline on Saturday. This system should be able to generate more snow for the region perhaps mixed with rain at times from late tomorrow night into late Saturday.
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A strong northwest flow follows yesterday’s coastal storm and the much colder-than-normal air mass stays in place right into the weekend. There is also a chance for snow showers today and perhaps even an isolated heavier snow squall or two this afternoon which can bring quick small accumulations of an inch or so. Low temperatures during the next couple of nights should drop to near or below the 20 degree mark in many suburban locations. High pressure builds into the area on Friday, but then another "clipper" low pressure system will head in our direction by Friday night/early Saturday and it can bring with it some more snow or sleet. Looking ahead, winter is not over yet as it looks like there will be more cold air outbreaks and potential snow threats.
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A thin layer of warm air in the lower part of the atmosphere has helped to produce sleet in many areas during the past several hours and this will cut way down on the potential snow totals for this storm. In fact, freezing rain has also gotten into the mix in some portions of the I-95 corridor. As the rapidly intensifying low pressure system pulls northeast this morning, the sleet - which will be heavy at times - should change to snow in many areas to the northwest of Route I-95 and additional snow accumulations are still likely, but nothing like earlier prospects. The good news about sleet is that it bounces off of tree limbs, but rain, of course, is not good news as it'll help to weigh down tree limbs that received snow cover last night. Roads are quite slippery in many areas with a coating of packed down snow and sleet.
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If there is one important real-time observation this evening, it is that the low pressure system may be forming a bit to the east of model forecasts which would bring about a slightly colder solution for many (i.e., more snow and less sleet, rain); for example, near some of the coastal regions and in the DC metro region.Low pressure is now forming off the coast of South Carolina and it will intensify rapidly over the next 12-24 hours as it moves slowly northeastward. The central pressure of the developing low pressure system is now at about 29.83 inches and it should deepen to about 29.18 inches by early tomorrow morning and then to near 28.94 inches by early tomorrow evening. There is some precipitation already showing up in the DC and Philly metro regions that is taking on all forms (i.e., rain, sleet and snow), but it is rather spotty and will become heavier and steadier near and after midnight.
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All systems are go for a major storm to roar up the east coast tonight and Tuesday and it should result in a substantial snowfall for the I-95 corridor from DC-to-Boston. The “sweet spot” for heaviest snowfall amounts should end up being just to the north and west of Route I-95 where more than a foot can fall in many suburban locations of the big cities. The precipitation may begin as a mix in the DC metro region, but then should become primarily snow and it should be primarily in the form of snow throughout the event in Philly and NYC. Just to the south and east of Route I-95, mixing with rain or ice will be an issue and there will be a sharp drop off in snowfall totals from that narrow zone to the coastline. In addition to the heavy precipitation, winds will become a problem with this powerful coastal storm and power outages are even a possibility in areas with heavy, wet snow accumulations and strong wind gusts. While the brunt of the storm will be later tonight and tomorrow morning in terms of the heaviest snowfall, there will be enough instability in the upper-levels of the atmosphere that some “wrap around” snow is quite likely later Tuesday and even on Wednesday which can add some to the total accumulation amounts. It stays very cold following the storm on Wednesday and Thursday.
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All signs continue to point to a major storm roaring up the east coast Monday night and Tuesday and it should result in a substantial snowfall for the I-95 corridor from DC-to-Boston. The “sweet spot” for heaviest snowfall amounts could end up being just to the north and west of Route I-95 where more than a foot can fall in the suburbs of the big cities. Mixing with rain or ice can become an issue to the areas just south and east of Route I-95 and there will be a sharp drop off in snowfall totals from that narrow zone to the coastline, but odds favor primarily snow in and to the north and west of the big cities. In addition to the heavy precipitation, winds will become a problem with this powerful coastal storm and power outages are even a possibility in areas with heavy, wet snow accumulations and strong wind gusts. While the brunt of the storm will be Monday night and Tuesday morning in terms of heaviest snow, there will be enough instability in the upper-levels of the atmosphere that some “wrap around” snow is quite likely later Tuesday and Wednesday that can add some accumulations to the totals. It stays very cold following the storm on Wednesday and Thursday as well and, believe it or not, there could be another threat of snow for next weekend.
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All signs continue to point to a major storm along the Mid-Atlantic coastline by early Tuesday and it could result in a substantial snowfall for parts the I-95 corridor. This storm looks like it will have the potential to produce 1-2 feet of snow, but exactly where that heaviest snowfall sets up is still in question as the storm track could be anywhere from just inland to just off the Mid-Atlantic coastline - and this difference can be crucial to the I-95 corridor. The end result is that there is likely to be a sharp snow accumulation gradient with this storm – perhaps setting up from right along Route I-95 to the coast. By the way, the last great snowstorm during the month of March for the Mid-Atlantic region was the so-called "Storm of the Century" in March 1993.
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Low pressure that has formed along an Arctic frontal boundary zone is now pushing to the east and colder air has worked into the region from the north-to-the-south. Snow in the area this morning and it lasts into the mid-day or early afternoon hours and there can be a couple of late afternoon snow showers – perhaps even a heavier snow squall - with total snow accumulations possible on the order of 3-6 inches. After Arctic cold air floods the area tonight and Saturday, the next storm system will be suppressed well to the south - sparing the region of any late weekend snowfall. A third and potential monster storm is likely to develop near the Mid-Atlantic coastline in the late Monday night or Tuesday time frame and it could intensify rapidly near the coastline with lots of cold air in place – in other words, lots of snow potential. Stay tuned, one of the trends to watch over the next few days will the exact storm track as one just inland could bring enough warmer air in from the ocean for a changeover of snow-to-rain along and east of I-95.
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