The month of December has gotten off to a cold start across much of the eastern half of the nation and it should stay colder-than-normal right through the upcoming weekend. A strengthening low pressure system will move across southern Canada during the next couple of days reaching the Canadian Maritime Provinces by late Thursday and this system and associated cold front will have multiple weather impacts on the Great Lakes, Mid-Atlantic and Northeast US.
To begin, this storm system is likely to add to the on-going “lake-effect” snows across the Great Lakes during the next couple of days and it will also produce some accumulating snow in the interior, higher elevation locations of the Mid-Atlantic and Northeast US. Even the I-95 corridor region from DC-to-Philly-to-NYC-to-Boston can experience small accumulations of snow from later tomorrow night into Thursday with the combination of snow showers and perhaps even a heavier snow squall. In addition, winds will become a big factor with a stiffening southwesterly flow of air out ahead of the approaching strong cold front and then potentially damaging gusts to 50 mph or so from a northwesterly direction on Thursday following the passage of the front. One last impact will be the influx of another Arctic air mass that will flood the northeastern states riding into the region on those powerful NW winds and likely resulting in the lowest wind chills of the season so far.
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The month of December has gotten off to a cold start across much of the nation and it’ll stay colder-than-normal in the DC-to-Philly-to-NYC corridor right through the upcoming weekend. Strong and strengthening low pressure will pass by to our north on Thursday and its trailing cold front will push through during the morning hours. This low pressure system and its associated cold front will have many weather impacts on the region from later tomorrow into the day on Friday.
Ahead of the system, winds will increase from a southwesterly direction later tomorrow and tomorrow night and then can gust to 50 mph or so from a northwesterly direction later Thursday and Thursday night on the backside of the front. Also, there is a good chance of snow and/or rain showers on Wednesday night and snow showers are possible on Thursday morning - perhaps even a heavier snow squall - as the strong front comes through the area with small accumulations on the table. Finally, the passage of the cold front will flood the Mid-Atlantic region with another Arctic air mass that will keep temperatures around here well below-normal on Thursday night and Friday and we’ll experience the lowest wind chills so far this season.
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The month of December has gotten off to a cold start across much of the nation and it’ll stay colder-than-normal in the DC-to-Philly-to-NYC corridor right through the upcoming weekend. The potential for any significant snow during this time period is quite limited; however, a “clipper” type of low pressure system can bring snow and/or rain showers here from later Wednesday night into early Thursday and small accumulations cannot be ruled out. More important weather impacts associated with this “clipper” system will include powerful winds that can gust past 45 mph or so on Thursday and the influx of another Arctic air mass into the Mid-Atlantic region for the end of the week.
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One of the coldest patterns in many years to start the month of December will result in below-normal temperatures right through the upcoming weekend and we’ll have a “clipper” to deal with on Wednesday night and Thursday. That “clipper'“ system will push eastward from southern Canada on Wednesday and slide well to our north into northern New England by early Thursday. It can bring some rain and/or snow showers to the region late Wednesday night and early Thursday and then the winds will become a big factor as the pressure gradient intensifies on the backside of the departing and strengthening low pressure system.
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A cold front cross the region on Tuesday, but the air behind it will not be all that cold and temperatures later today should peak in the lower 50’s. Low pressure from the Tennessee Valley will move northeast later today and spread rain into our area from later tonight into Thanksgiving Day. Temperatures on Thursday are likely to spend most of the day at or slightly below the 50 degree mark and it turns colder by the upcoming weekend as a broad northwesterly flow of air forms on the backside of the departing low pressure system. The cold air outbreak that reaches the Mid-Atlantic region this weekend will be the opening salvo of what looks like an extended colder-than-normal stretch of weather that likely lasts through the first couple of weeks of December.
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One of the biggest weather stories going forward is the cold wave that is coming to much of the nation beginning late this week and likely continuing for much of the first couple weeks of December. In fact, this will likely be one of the coldest starts to the month of December in many years and it will have a “Siberian” connection.
Before we get to the cold wave, there will be a lot of weather to go through across much of the nation with significant snowfall in some areas. Low pressure is currently pushing eastward across the higher elevations of the western US resulting in substantial snow accumulations from the Sierra Nevada Mountains of eastern California to the Colorado Rockies. Some of these locations will end up with snow totals on the order of 1-2 feet before this low spills out into the middle of the nation at mid-week.
From there, this low pressure system will move rather quickly across the Tennessee Valley on Wednesday night and to the southern New England coastline by mid-day Thursday. As a result, rain is likely to reach the DC-to-Philly-to-NYC corridor by late Wednesday night and continue into Thursday (Thanksgiving Day). Farther to the north, accumulating snow is likely to fall from early Thursday into early Friday across interior, higher elevation locations of northern PA, upstate NY and interior New England with several inches on the table.
Following the departure of the low pressure system to the western Atlantic, a northwesterly flow of air will develop across the northeastern quadrant of the nation bringing much colder-than-normal air from Canada into the Great Lakes, Mid-Atlantic, and Northeast US. The “Great Lakes snow machine” will get turned on with the much colder-than-normal air flowing over the still relatively warm waters of the Great Lakes from later Friday into Saturday and there is likely to be much more in the way of “lake-effect” snow activity during this upcoming cold wave.
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A cold front will cross the region early today and there will be lingering showers this morning and then clearing skies in the afternoon. It’ll be chilly on Wednesday with partly sunny skies and then attention turns to a low pressure system that will approach the region from the southwest. This system will likely push rain into the area from late Wednesday night into Thursday and then it should turn out to chilly and breezy on Friday with clearing skies. The weekend looks windy and cold in the Mid-Atlantic region and the colder-than-normal pattern that sets up this weekend is likely to last through at least the first full week of December.
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Low pressure will push eastward across the higher elevations of the western US during the next few days resulting in significant snow accumulations on the order of 1-2 feet from the Sierra Nevada Mountains of easter California to the Colorado Rockies. This same low pressure system will then spill out into the middle of the nation at mid-week and move rather quickly across the Tennessee Valley on Wednesday night and to the Mid-Atlantic coastline by mid-day Thursday. As a result, rain is likely to reach the DC-to-Philly-to-NYC corridor by late Wednesday night and continue into Thursday (Thanksgiving Day) morning. Farther to the north, accumulating snow may fall from Thursday into Friday across interior, higher elevation locations of upstate PA and upstate NY to New England.
Following the departure of the low pressure system to the western Atlantic, a northwesterly flow of air will develop across the northeastern states bringing much colder-than-normal air from Canada into the Great Lakes, Mid-Atlantic and NE US. The “Great Lakes snow machine” will turn on with the much colder-than-normal air flowing over the still relatively warm waters of the Great Lakes. Looking ahead, the influx of much colder-than-normal air into the eastern states by this weekend will begin a cold pattern that is likely to last well into December... one of the coldest starts in many years to the month of December and it will have a “Siberian connection”.
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A cold front will cross the region on Tuesday and it is likely to bring some rain to the area from late tonight into early tomorrow. After the frontal passage, it’ll be chilly on Wednesday with partly sunny skies and then attention turns to a low pressure system that will approach the region from the southwest. This system will likely push rain into the area from late Wednesday night into Thursday morning and then it should turn out to chilly and breezy on Friday with clearing skies. The weekend looks windy and cold in the Mid-Atlantic region and the colder-than-normal pattern that sets up this weekend is likely to last through at least the first full week of December.
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Colder air has wrapped into our slow-moving storm system and there will be plenty of moisture to deal with today throughout the Mid-Atlantic region. As a result, snow is likely later this morning across many of the northern and western suburbs and there can be small grassy accumulations. Any snow that falls later this morning is likely to change back to rain this afternoon as the overall upward motion in the atmosphere weakens. Significant snowfall is falling across the the higher elevation locations of western Maryland (Garrett County) and across central and eastern West Virginia where early season skiing conditions should be quite good. Any snow that falls will be of the “wet” variety as low-level temperatures will be “borderline” throughout this event.
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