Precipitation is likely to arrive this morning in the form of snow and then transition to a wintry mix later in the day and there can be a small snow accumulation before the changeover and an ice buildup afterwards on untreated surfaces. A cold front will sweep through the region later tonight and there is likely to be more rain although sleet can be mixed in at times. Another low pressure system is destined to impact the region late in the week, but in this case, they’ll be no strong high pressure to the north; consequently, it should be liquid and not frozen.
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“Round 1” of our extended winter weather event is winding down and “round 2” is about to get underway. The first part of this long event brought some accumulating snow to the Philly metro region and a combination of snow and ice to the DC area while NYC stayed precipitation-free. “Round 2” will result in heavier overall precipitation amounts with accumulating snow and ice in Philly and NYC and an icing threat for some of the suburbs to the north and west of DC.
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A significant winter weather event will begin here tonight as copious amounts of moisture flows northeastward into the Mid-Atlantic region. Snow is likely to break out by later tonight and continue into Tuesday with accumulations of 2-5 inches possible by morning. Snow will then change to sleet and freezing rain on Tuesday before ultimately changing to plain rain late as temperatures climb above the freezing mark. More frozen precipitation is possible later tomorrow night for a brief time as the storm winds down.
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A couple of systems will bring an extended wintry weather event to the Mid-Atlantic region resulting in significant snow and/or ice. The first system will generate precipitation in the region from later this evening into early Monday morning and, with little down time in between, a second and stronger system will bring heavier precipitation amounts from later tomorrow into late Tuesday. Given the expected combination of snow and ice and very cold ground-level conditions, travel may become hazardous for commutes on both Monday and Tuesday in much of the region.
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A couple of systems will bring wintry weather to the Mid-Atlantic region and while neither may be major snow producers, they both can be quite impactful. It appears each of these two systems may bring some snow and ice to the DC-to-Philly-to-NYC corridor in the period from Sunday night into late Tuesday. One disturbance will arrive on Sunday night with precipitation mainly in the form of snow north of the PA/MD border and a mix of snow and ice south of the Mason-Dixon Line. A second and stronger system with more moisture will bring snow, ice and rain to the Mid-Atlantic region from late Monday afternoon into late Tuesday. Given the expected combination of snow and ice and the cold ground-level conditions, roads may become an issue for commutes on both Monday and Tuesday in much of the region. Accumulations of up to a few inches of snow and ice are possible with each event north of the PA/MD border and from a coating to an inch or two south of the PA/MD border.
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An active and complex weather pattern will bring back-to-back threats to the Mid-Atlantic region early next week and there can be some accumulating snow in each event. The first system will be rather weak, but it can still generate some accumulating snow from Sunday night into early Monday in the DC-to-Philly-to-NYC corridor. The second and stronger system will have much more available moisture compared to the first and its main impact will likely take place from later Monday into Tuesday night. This second event could feature a snow-to-ice-to-rain scenario with snow and ice accumulations possible on the front end before any changeover to plain rain.
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The overall weather pattern looks quite active in coming days with multiple waves likely to trek across the country. One wave will arrive in California by the early part of the weekend and then reach the Great Lakes region by Sunday evening. This system will spread snow into the Ohio Valley by later Sunday and then snow could break out here in the Mid-Atlantic region on Sunday night and continue into early Monday. A second and stronger wave will follow quickly and it could bring substantial amounts of precipitation here on Tuesday – perhaps a snow-to-ice-to-rain scenario.
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This week has been featured some unseasonably mild weather in the Mid-Atlantic region, but a strong cold frontal passage on Friday will usher in a much colder air mass for the weekend and there are reasons to believe that we may be entering an extended cold and stormy stretch of weather. A tropical disturbance known as the Madden-Julian Oscillation (MJO) is forecasted to enter into “phases” that argue for colder-than-normal conditions in much the eastern US for an extended period of time. In addition, the overall pattern is shaping up to be quite active with numerous systems likely to cross the country in coming days and threaten this region with lots of wintry precipitation.
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Today will be another damp day in the Mid-Atlantic region with an occasional shower or some patchy drizzle that’ll continue into the overnight hours as a strong cold front approaches from the west. That front will slide through early tomorrow and usher in a much colder air mass for the upcoming weekend. Winds will kick up tomorrow afternoon behind the frontal passage and temperatures will begin to slide. Both weekend days will feature afternoon temperatures primarily in the 30’s despite some sunshine each day. Looking ahead, next week looks quite active with multiple threats and plenty of cold air around. A wave of low pressure may generate some snow or snow showers on Sunday night and/or Monday and then another system may impact the region with snow or rain by Tuesday...stay tuned.
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It’ll be much colder today compared to Tuesday as a frontal passage in the overnight hours has ushered in quite a different air mass compared to yesterday. Some rain is likely here by later today and it'll continue into the overnight hours and we'll stay damp on Thursday with more showers possible as it turns a bit milder. A strong cold front will arrive early Friday and we’ll turn windy and colder late in the day and at night which will set us up for a cold weekend.
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