A slow-moving cold front will push across the region later this afternoon and temperatures will fall through the evening hours. Showers ahead of the front will continue through the afternoon in the I-95 corridor and then enough cold air will filter into the region for a changeover to snow around or shortly after midnight. The snow will then continue into early Wednesday with some accumulations along the I-95 corridor on the order of a coating (urban areas) to 2 or 3 inches (northern/western suburbs). The snow will have a much more difficult time sticking to the asphalt roadways during this event after today’s warmth as compared with grassy surfaces, but that raises the chances for black ice during the morning commute as temperatures will be near freezing.
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A strong cold front will slowly work its way through the region late this afternoon and colder air will push in during the early evening hours. There will be occasional rain showers today ahead of the slow moving cold frontal system; primarily, during the mid-day and afternoon hours and temperatures will peak early in the mid and upper 50's. The precipitation could actually slacken off or end briefly this evening, but as a wave of low pressure forms along the frontal boundary zone, it'll then resume and likely change from rain-to-snow shortly after midnight. The snow will continue through much of the morning on Wednesday, but it can mix with rain again as it winds down around mid-day. Accumulations are likely to average out in the range of a coating to three inches with the lower amounts in the metro region and the higher amounts in the northern and western suburbs. Snow will have a more difficult time sticking to the roadways as compared with grassy surfaces, but there still can be some impact on the morning commute.
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A strong cold front is pushing across the Upper Midwest and it is the leading edge of some very cold air for this time of year (Minneapolis, for example, to drop to five degrees below zero later tonight). 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 the southwest to the northeast. At the same time, upper-level energy will be moving to the northeast from the south-central US and it’ll ride up along the slowly advancing frontal boundary zone. As a result, precipitation will become enhanced behind the surface cold frontal system and this will lead to a rain-changing-to-snow scenario along the I-95 corridor from late Tuesday night into Wednesday morning. Accumulations are likely during this rain-to-snow event early Wednesday on the order of a coating to three inches and this should take place in the big cities as well.
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A warm front will push through the region today and it’ll turn much milder with occasional rain or drizzle and temperatures reaching the middle 50’s. A strong cold front will slowly advance towards the region on Tuesday and it’ll stay quite mild with temperatures climbing towards the 60 degree mark and there will be more shower activity. A wave of low pressure is likely to form along the cold frontal boundary zone on Tuesday night as the colder air begins to arrive and there is a likelihood for rain changing to snow and some accumulations are likely from late Tuesday night into Wednesday morning. Once that wave of low pressure passes by the northeast of here, the flood gates will open and cold air will pour into the Mid-Atlantic region. High temperatures on Thursday will struggle to reach the mid 30’s in the NYC metro region.
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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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