A weak cold frontal system passed through the region last night and its passage has ushered in a reinforcing shot of cold air and temperatures will remain at below-normal levels for the next couple of days. It’ll turn a bit milder on Friday ahead of the next cold front which will usher in another cold air mass for the start of the weekend. Some moderation in temperatures will take place on Sunday and then it'll turn noticeably milder on Monday and Tuesday with showers possible each day. Another strong cold front will then usher in a cold air mass for the middle and latter parts of next week.
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The snow pack across the nation is well above-normal for early December and it is actually at or near record high levels across all of North America. In addition, the first few days of December are colder-than-normal across the nation as a whole and this follows a colder-than-normal month of November for the eastern two-thirds of the nation. Looking ahead, multiple cold air outbreaks are destined to reach the central and eastern US from Canada right into at least the middle part of the month, but there will be some short-lived warmer-than-normal breaks as well.
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A couple of frontal systems will impact our weather over the next few days with the initial front passing through the region later today. There can be a rain or snow shower early today as the front approaches the region and then an afternoon and evening rain shower is possible. A stronger cold front will arrive late Friday and it will be backed up by Arctic high pressure as we head into the upcoming weekend. As high pressure returns here on Saturday, temperatures will likely be confined to 40 degrees for highs and will then rebound some on Sunday. By early next week, a southwesterly flow of air will develop in the eastern US and we’ll turn milder along with an increasing chance of showers for both Monday and Tuesday. A strong cold front will then usher in another cold air mass for the middle of next week.
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Low pressure will push away from the New England coastline today and head towards Nova Scotia, Canada. High pressure will push into the region from the west and southwest and the result will be a pretty calm rest of the work week with moderately cold conditions. The passage of another cold front will usher in colder air for the upcoming weekend.
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Low pressure is located off the New Jersey coastline at mid-day and it will intensify over the next several hours as upper-level energy moves in overhead. Mixed precipitation is rotating around the surface low and will become mainly snow this afternoon and evening as colder air wraps into the system. Some snow will fall today and tonight in the Philly metro region, but the highest amounts will likely be confined to eastern Bucks County near the Delaware River and to the north and east of there which will put the northern half of New Jersey and the NYC metro region in prime zones for more significant accumulations from this western Atlantic storm. Little to no snow accumulation is likely in Chester County (SE PA) and in areas to the south of the PA/MD border.
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Low pressure will spin off the Mid-Atlantic coast for awhile as we begin the new work week and colder air will wrap in around the system. As a result, any rain showers around here this morning will likely change to snow showers and the threat for snow showers can continue into the evening hours. Minor accumulations of a coating to an inch or so are possible from this system; especially, across northern MD suburbs. The weather calms down on Tuesday and remains relatively quiet for much of the remainder of the week and moderately cold for the beginning of December.
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A long duration winter weather event is underway in the Mid-Atlantic region with a cold “plain” rain south of the PA/MD border, freezing rain and sleet across southeast and east-central PA, and snow is a factor in northeastern PA, interior upstate NJ and in the NYC metro region. As colder air wraps around a very slowly moving and intensifying low pressure system later tonight, accumulating snow will become an increasingly important factor for most areas and accumulations are likely; especially, north of the PA/MD border. In fact, there is the chance that some spots in the Mid-Atlantic region experience significant snowfall amounts on Monday and Monday night as intense mesoscale heavy snow bands are likely to form during this event.
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The major storm that slammed into the west coast a few days ago will result in a long duration winter weather event for the Mid-Atlantic region from late tonight into Monday night. This system is now generating blizzard conditions across the Dakotas and heavy snow will extend into the Upper Midwest later today and tonight. The upper-level feature associated with this storm has made its farthest push to the north into South Dakota and it will now be forced to shift to the east-southeast by an “atmospheric roadblock” in the form of upper-level high pressure ridging over southern Canada. The end result will be a cold air mass stuck in place in the lowest levels of the Mid-Atlantic region when precipitation arrives late tonight/early Sunday and this will lead to a period of sleet and/or freezing rain at the onset of this long duration event in much of the DC-to-Philly-to-NYC corridor. A change to plain rain is likely in many areas along the immediate I-95 corridor later tomorrow and there even be a slackening off of the precipitation early tomorrow night. Late tomorrow night and during the day on Monday, colder air will wrap around into intensifying low pressure off the Mid-Atlantic coastline and this will result in a changeover to snow in most areas and significant snow accumulations are possible; primarily, north of the PA/MD border.
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The major storm that slammed into the west coast a couple of days ago will result in a long duration winter weather event for the Mid-Atlantic region from later this weekend into early next week. This system now over the interior western US will head northeast towards the Northern Plains over the next day or so and will generate significant snow this weekend from the Northern Rockies to the Upper Midwest. It is at this point in time that this system will run into an “atmospheric roadblock” in the form of upper-level high pressure ridging over southern Canada and switch from a northeasterly direction to east-southeast. The end result will be a cold air mass in place in the Mid-Atlantic region when precipitation arrives later Saturday night and low pressure is likely to spin just off the coastline as late as late in the day on Monday. This long lasting winter weather event could feature some ice and/or snow accumulations at the front end for much of the Mid-Atlantic region – perhaps plain rain for awhile in the middle – and then potentially significant accumulating snow on the back end.
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One strong storm is producing heavy snowfall across the Upper Midwest today and it’ll generate some very strong winds later today into Thursday in a large section of the country extending from the Great Lakes/Ohio Valley to the Mid-Atlantic/NE US. Another powerful storm continues to wreak havoc across much of the western third of the nation with heavy coastal rain and significant inland snows. This second system will push to the northeast over the next couple of days, but once it reaches the Dakotas, it’ll run into an “atmospheric roadblock” and be “forced” to slide southeast towards the Mid-Atlantic/NE US coastline by later this weekend into early next week. The result of this storm track will allow for cold air to be in place in the Mid-Atlantic/NE US when the storm arrives later this weekend and this raises the chance for snow and ice. The threat for snow and ice will continue into Monday for this part of the nation as the surface low spins around just off the coastline of the Mid-Atlantic/NE US.
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