A cold front passed through the region earlier today and it’ll turn breezy and cooler following the frontal passage. Low pressure will slide from the middle of the country at mid-week and head towards the northeastern states with an increasing chance of showers and thunderstorms later tomorrow night and on Thursday, Thanksgiving Day. It’ll turn colder and windy to follow this system from Friday into the upcoming weekend.
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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 approach the region later today bringing with it a chance of PM showers and it’ll turn breezy and cooler on Tuesday following the frontal passage. Low pressure will slide from the middle of the country at mid-week and head towards the northeastern states with an impact around here on here for Thanksgiving Day. Showers and thunderstorms will be possible on Thursday and it'll turning colder and windy to follow into the upcoming weekend.
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As a potent upper-level trough rotates around across the northeastern, winds around here will remain quite strong out of the west-northwest and this keep us colder-than-normal for this time of year. High temperatures during the next few days will be confined to the 50’s to go along with mainly sunny skies.
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As a potent upper-level trough pushes into the Mid-Atlantic region later today, winds around here will stiffen out of the west-northwest and this will bring much cooler conditions to the region. After high temperatures on Wednesday close to 60 degrees, we’ll likely be confined to 50 degrees later today along with the strong winds gusting up to 30 mph or so.
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The weather map is quite busy currently across North America with intense high pressure ridges combined with deep troughs of low pressure and on top of that we have some tropical moisture on the playing field as well. A deep trough over the northeastern Pacific Ocean will help to spawn a rapidly intensifying storm system that will slam into the Pacific Northwest from later today through tomorrow with hurricane-force winds, tremendous rainfall in low-lying areas, and substantial snowfall in the inland, higher elevation locations that will be on the order of several feet in some spots. This storm system will become a slow-mover and there will be lingering effects from northern California to Oregon and Washington all the way through the second half of the week.
Another upper-level trough will slide south and east during the next couple of days from the north-central states and deepen markedly as it reaches the Mid-Atlantic/Northeast US by later Thursday. An initial low pressure system will head to the Great Lakes while a secondary forms near the northern Mid-Atlantic coastline. This unfolding storm system will also become a slow-mover during the latter part of the week and will bring with it beneficial rains, accumulating snows across inland, higher elevation locations, and a prolonged period of strong NW winds.
Looking ahead, there are signs for multiple cold air outbreaks to make their way from northern Canada into the central and eastern US as we push through the remainder of November and into the early part of December...quite a winter look to the overall pattern that should include threats of snow as well.
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Quite an active and somewhat unusual weather pattern is developing across North America and one that will feature multiple intense upper-level ridges of high pressure and deep troughs of low pressure. One result of this overall pattern will be a powerful storm system that will slam into the Pacific Northwest from later tomorrow into Wednesday. This storm will feature explosive intensification with as much as a 70 millibar drop in 24 hours of its central pressure yielding the strength of a “category 4” hurricane and easily classifying it as a “bomb cyclone”. Another significant storm system will develop in this active weather pattern during the late week bringing with it rain, accumulating snows, and a sustained period of strong winds across the Great Lakes, Mid-Atlantic, and Northeast US.
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The next couple of days will be unsettled across the region as a cold front swings through the Tennessee Valley bringing with it the chance for occasional showers and thunderstorms. Some of the rain on Tuesday can be on the heavy side as the front pushes through the region and there can be some gusty winds as well. The second half of the week will be quieter and colder following the passage of the cold frontal system.
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Nice weather returns to the region for the late week and weekend with high pressure taking back control. Both weekend days should feature plenty of sunshine and mild conditions with temperatures climbing well up into the 60’s.
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It is not all that unusual for the “last hurrah” of an Atlantic Basin tropical season to be followed by an influx of winter-like cold into the central and eastern US and, in some cases, it is a “pattern-changing” type of event. One such example of this kind of scenario unfolded with Hurricane Sandy at the end of October during 2012 which was then followed by a colder-than-normal month of November in almost all areas east of the Mississippi River. (In fact, cold air not only followed Hurricane Sandy, but actually wrapped into it with as much as 3 feet of snow piling up in portions of West Virginia during that event). It appears that this tropical season may finally wind down after the ultimate demise of the latest system now over the Caribbean Sea and cold air intrusions into the central and eastern may become much more commonplace beginning late next week. The tropical system is likely to intensify into a named tropical storm (“Sara”) in the near-term, but an extended time period over land will likely reduce its potential impact on the US Gulf coast.
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