If you had December 9th in your snow pool, you're looking pretty good right about now. Low pressure will push out of the eastern Gulf region later today and head to a position off the Mid-Atlantic coastline by later tomorrow and the big cities from DC-to-Philly-to-NYC will receive their first accumulating snowfall of the winter season. Accumulations on the order of 2-4 inches are likely from late tonight into late tomorrow in and around the big cities with 3-6 inches possible across the Delmarva Peninsula. Residual snow showers are possible early tomorrow night as an upper-level low pushes by just to our north. It stays cold on Sunday and Monday and then the next shot for snow or snow showers will come on Tuesday as a significant cold air outbreak heads towards the Mid-Atlantic region. Temperatures at mid-week will struggle to reach the 35 degree mark for highs following that next snow threat.
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Now that the (sustained) colder pattern has set up in the Mid-Atlantic region, it is time to focus on the threat for snow and indeed there are multiple chances over the next several days. The first legitimate chance for accumulating snow in the immediate I-95 corridor will come late Friday night and Saturday as low pressure pushes from the Southeast US to a position off the Mid-Atlantic coastline. A second shot will come Saturday night/early Sunday as deep upper-level low passes by just to our north. Finally, as a significant cold air outbreak arrives late Tuesday into early Wednesday, low pressure may try to form over the Northeast US and it could generate some snow for parts of the Mid-Atlantic. Following the passage of that low pressure system and its associated strong cold front, very cold air will flood into the region at mid-week.
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Now that the (sustained) colder pattern has set up in the Mid-Atlantic region, it is time to focus on the threat for snow and indeed there are multiple chances over the next several days. The first legitimate chance for snow in the immediate I-95 corridor will come late Friday night and Saturday as low pressure pushes from the Southeast US to a position off the Mid-Atlantic coastline. A second shot will come Saturday night/early Sunday as deep upper-level low passes by just to our north. Finally, as a significant cold air outbreak arrives late Tuesday into early Wednesday, low pressure may try to form over the Northeast US and it could generate some snow for parts of the Mid-Atlantic. Following the passage of that low pressure system and its associated strong cold front, very cold air will flood into the region at mid-week.
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A major pattern change to cold has now begun in the Mid-Atlantic region with the passage of a strong cold frontal system and it is going to get worse before it gets better. This initial shot of cold air is not brutal, not record-breaking by any means, but it is just the front end of a pattern change that will bring even colder air here for the late week and weekend, and then some big time cold is destined to flood the Mid-Atlantic region by the middle of next week. In fact, it is possible that DC, Philly and NYC will struggle to reach the freezing mark for highs by the middle of next week. In addition to the intensifying cold over the next several days, there are some prospects for snow in the I-95 corridor. The first chance of snow will come from later Friday into Saturday, the second shot comes Saturday night into early Sunday, and then the third threat comes in the Tuesday/early Wednesday time frame associated with the mid-week significant cold air outbreak.
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A major pattern change to cold begins today following the passage of a strong cold frontal system and temperatures this afternoon will be noticeably colder than yesterday’s mild conditions. This change to cold will be rather sustained with a good chance for below-normal temperatures on average from this point through most, if not all, of the month of December. This initial shot of cold air will feature an intensifying trough of low pressure in the eastern US with plenty of waves of energy rotating through and each system will attempt to generate low pressure near the east coast. As a result, the threat for some snow or snow shower activity will persist from later this week into the upcoming weekend. Signs point to an even colder air mass to arrive next week in the eastern US which will be way below-normal for this time of year and this blast may be accompanied by some snow.
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A major pattern change is going to begin on Wednesday in the Mid-Atlantic region and it will result in an extended period with colder-than-normal temperatures. This initial shot of cold will be followed by a reinforcing cold air mass this weekend and then a significant cold air outbreak is likely next week which may accompanied by a coastal storm. The pattern-changing cold front is now crossing the Ohio Valley and it is trailing a powerful storm just north of Lake Superior.
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A major pattern change is going to take place around here over the next couple of days and it will lead to a sustained period of colder-than-normal temperatures. The strong cold front that will usher in the initial cold shot in this unfolding pattern change will produce showers around here from later today through tonight and there can be a period of steadier rain early this evening. On Wednesday, the wind will pick up out of the northwest and the colder air mass will push into the Mid-Atlantic region and actually end up extending all the way down into the Deep South. An intensifying upper-level trough in the eastern US will have lots of energy rotating around it late this week and this weekend and there is the potential for low pressure to form near the east coast which could result in some snow shower activity for the I-95 corridor. Another cold air outbreak is destined to arrive next week and it looks to be even colder than this initial blast and way below-normal for this time of year.
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A major pattern change is going to begin on Wednesday in the Mid-Atlantic region and it will result in a period of sustained colder-than-normal temperatures that will assure a much different December compared to the last five. This pattern change to cold will also include increasing chances for snow – perhaps as early as late this week or during the upcoming weekend – as an active upper-level trough forms in the eastern US associated with the initial cold blast.
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A major pattern change is going to take this week in the Mid-Atlantic region that will result in a sustained period of colder-than-normal temperatures and there will be snow threats as well. The strong cold front that will usher in the initial cold shot in this unfolding pattern change will produce showers around here from later tomorrow into early Wednesday. By late Wednesday, the wind will pick up out of the northwest and the colder air mass will pour into the Mid-Atlantic region.
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A major pattern change is going to take place next week in the Mid-Atlantic region that will result in a sustained period of colder-than-normal temperatures. This change to sustained cold in the Mid-Atlantic region will be the result of a combination of strong high-latitude blocking (i.e., nearly stationary strong high pressure over Greenland and northern Canada), an intensifying upper-level trough in the central and eastern US, and strong high pressure ridging along the west coasts of Canada and the US. The strong cold front that will begin the pattern change to cold will arrive with showers on Tuesday night and Wednesday and then colder air will pour into the region later Wednesday into Thursday.
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