Low pressure will head to a position off the Mid-Atlantic coastline by later today at the same high pressure to our north retreats into the northwestern Atlantic. It’ll be cold enough for awhile longer this morning for mixed precipitation across some suburban locations, but the influx of slightly milder ocean air will cause a transition to plain rain throughout the area by the late morning/mid-day hours…watch for slick spots on some suburban roadways during the morning hours.
High pressure takes control of the weather for the mid-week and then a cold frontal passage on Thursday night will usher in the coldest air so far this season. As a result, temperatures are likely to bottom out near 20 degrees across most suburban locations by early Friday morning. After that, we’ll have to monitor the movement of low pressure across the southeastern states. There is a chance that this system pushes far enough to the north by Friday night/ Saturday to produce some snow in the Mid-Atlantic region...we’ll closely monitor this threat during the next few days.
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December has begun on a cold note across the northeastern states and below-normal temperatures are likely on average through at least the first half of the month. Two factors that have been pointing us to an extended cold stretch this month include an unusually early stratospheric warming event over the polar region of the Northern Hemisphere, and the movement of a tropical disturbance along the equator that is moving through locations which favor colder-than-normal weather in the eastern states.
The cold pattern will remain active as well with the next storm system to impact the Mid-Atlantic and Northeast US on Tuesday, and this follows a significant Great Lakes snow event late last week and a major snowstorm in the Midwest this past weekend. The best chance for significant snow on Tuesday will be across the interior sections of the northeastern states where several inches of snow are likely and heavy rain is the main threat along coastal areas from southern New Jersey to the Delmarva Peninsula. The I-95 corridor will be in the “battle zone” region for awhile on Tuesday morning with snow and ice likely at the front end that will transition to plain rain for the main part of the storm. Small snow accumulations are possible before the transition to plain rain with a coating in the Philly, DC, and NYC metro regions and maybe an inch or two in some of the northern and western suburbs...watch for slick spots during the AM hours.
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December begins on a chilly note and it looks like much of the first half of the month will feature colder-than-normal temperatures in the eastern half of the nation. In addition, the overall pattern looks to remain quite active with a couple of winter weather threats during the next several days. High pressure will build into New England today and then retreat to the northeast on Tuesday at the same time low pressure pushes toward the Mid-Atlantic coastline. Precipitation is likely to reach the area around or just before dawn and it could be cold enough for snow in most places. As the high retreats to the northeast, enough milder ocean air will push in to produce a changeover of the snow to rain and there can be icing for awhile during the transition. Accumulations are possible before the changeover on the order of a coating to an inch in the DC metro and up to a couple of inches in some of the far northern and western suburbs. High pressure takes control of the weather for the mid-week and then a cold front arrives by Thursday night perhaps associated with a couple of snow showers. The coldest air so far pushes in on Thursday night and overnight lows could bottom out in the upper teens in some spots. After that, we’ll be watching the progression of another low pressure system to our south which could produce some snow and ice around here by the end of the week.
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Several inches of snow will pile up this weekend across a large part of the Midwest and Great Lakes (where they are still reeling from some intense lake-effect snow bands) and another winter storm will hit the Mid-Atlantic region and Northeast US on Tuesday. The best chance for significant snow on Tuesday will be across the interior sections of the northeastern states and heavy rain is the main threat along coastal areas from southern NJ to the Carolinas. The I-95 corridor will likely be in a battle zone period for awhile on Tuesday with some accumulating snow and ice possible at the front end, but a changeover to rain is likely; especially, in the big cities from DC-to-Philly-to-NYC.
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A strong cold front passed through the region late yesterday and a secondary cold front will pass through later today. Temperatures tumbled in the overnight hours and will be colder-than-normal today, tomorrow and right through the upcoming weekend. Winds will become quite a noticeable factor as well strengthening today and gusting at 35+mph on Thursday night and Friday. This Arctic air outbreak will set off another round of Great Lakes-effect snows and there can be a couple of snow showers that make their way across the mountains and into the immediate I-95 corridor. Looking ahead, low pressure may try to ride up along an Arctic frontal boundary zone early next week and we’ll have to watch for a threat of rain, ice and/or snow in the Mid-Atlantic region during the Tuesday/Wednesday time period.
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The period between Thanksgiving and Christmas will begin with a major Great Lakes snow event from Thursday to Friday and an Great Lakes/Midwest snowstorm this weekend and it could end with a White Christmas in many parts of the country. Two of the factors that have been highlighted here, likely leading to a cold and active stretch of weather, include an unusual early season stratospheric warming event and the likely movement of a tropical disturbance into a location that favors colder-than-normal conditions across a large part of the nation. Both of these phenomena – stratospheric warming and tropical forcing – will likely lead to a “buckling” of the polar jet stream which can lead to the unleashing of multiple Arctic air masses from northern Canada into the US (with intense cold in the table), and an activation of the southern branch of the jet stream which will likely produce multiple snow/ice threats.
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A strong cold front will pass through the Mid-Atlantic region later today bringing with it some isolated shower activity. Temperatures will climb to the 60’s ahead of the front, but then tumble during the nighttime hours and the rest of the week will feature colder-than-normal conditions. Winds will become quite a noticeable factor as well strengthening during the day on Thursday and remaining strong during Thursday night and Friday. This late week Arctic air outbreak will set off another round of Great Lakes-effect snows and there can be a few snow showers that make their way across the mountains and into the I-95 corridor.
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Some much welcomed rain is headed to the Mid-Atlantic region for this afternoon and tonight and there can be scattered showers on Wednesday. This threat of rain comes ahead of an approaching cold front which will pass through the region later tomorrow and usher in a cold air mass for Turkey Day. A secondary cold front will pass through later Thursday and even colder air will follow for Thursday night night and Friday and the winds will become very strong throughout the northeastern states. Winds will relax on Friday night and Saturday as high pressured edges this way, but temperatures will remain below-normal right through the upcoming weekend.
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It is looking like a cold Turkey Day across the Mid-Atlantic region with well below-normal temperatures following the mid-week passage of a strong cold front. A secondary cold front arrives later Thursday, and winds will increase markedly on Thursday night and Friday behind this second frontal passage to go along with the colder-than-normal conditions. The chill will stick around right into the upcoming weekend throughout the northeastern part of the country. In terms of snow, this late week Arctic air outbreak will be the catalyst for another Great Lakes snow event in those areas just downstream of the still relatively warm waters and, in some cases, it may be intense with substantial lake-effect snow accumulations. Looking to the weekend, a new storm system could bring significant snowfall to portions of the Upper Midwest, Ohio Valley and again the Great Lakes region.
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High pressure will remain in control of the weather for another day producing some sunshine here today, light winds, and temperatures on the chilly side with afternoon highs near 50 degrees. A strong cold front approaches the area later tomorrow and the pushes through at mid-week. This system will bring more welcome rain to the area from later tomorrow into Wednesday and its passage will usher in an unseasonably cold air mass for Thanksgiving Day and a secondary cold frontal passage will ensure unseasonably cold weather for Friday and Saturday as well. The winds will become a noticeable factor on Thanksgiving Day from a northwesterly direction and then very strong on Thursday night and Friday. This late week Arctic blast will produce another Great Lakes snow event for those areas just downstream of the still relatively warm lakes, and a few snow showers could make their way all the way into the I-95 corridor.
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