A strong cold front will push across the Northern Plains and Upper Midwest on Monday and usher into these regions a bitter cold air mass for this time of year. This front will slow down in its advance to the south and east on Tuesday as it’ll become more aligned with an upper-level wind flow blowing front the southwest-to-northeast. At the same time, upper-level energy will be pushing along the southwestern portion of the front system in the Deep South and this is likely produce a wave of low pressure along the frontal boundary zone which could result in a rain-changing-to-accumulating snow scenario for the I-95 corridor from late Tuesday night into Wednesday morning.
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A strong cold front will push across the Northern Plains and Upper Midwest early next week and usher into these regions a bitterly cold air mass for this time of year. This frontal system will slow down in its advance to the south and east on Tuesday as it’ll become more aligned with an upper-level wind flow blowing from southwest-to-northeast. At the same time, upper-level energy will be moving over the southwestern portion of the frontal system in the south-central US on Tuesday. This setup could produce a wave of low pressure that forms along the frontal boundary zone and perhaps result in a rain-changing-to-snow scenario along the I-95 corridor late Tuesday night/early Wednesday.
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It’ll turn a bit milder today ahead of the next cold front which will usher in another cold air mass for the upcoming weekend. High pressure will shift off the coast on Sunday and it'll turn noticeably milder on Monday and Tuesday with a southwesterly flow of air and rain is possible each day. Another strong cold front will then slowly push through the region on Tuesday night and usher in a cold air mass for the middle of next week. There is the chance that rain changes to snow late Tuesday night/early Wednesday as the colder air arrives behind this slow-moving frontal system.
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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 at any time today as the front approaches the region and then another rain or snow shower is possible early tonight. 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 the 30's 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 around today off the Mid-Atlantic coastline and this will allow colder air will wrap into the system and push well to the south and east. As a result, any rain or wintry mix around here early today will change over to snow and the snow is likely to continue at varying rates into the overnight hours. One thing we'll have to watch for with this system are small-scale bands of heavy snowfall that are likely to form and any of these can generate much higher localized amounts. There may be quite a sharp gradient of snowfall totals from the metro area to the far northern and western suburbs with 3-6 inches in the metro region by late tonight and 6+ inches in the Lower Hudson Valley (NY) and interior sections of northern NJ. 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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