There will be two storms to deal with in the Mid-Atlantic/NE US in coming days with the first storm impacting this area from Friday into Saturday and the second storm Monday into Tuesday. The initial storm will be predominately a plain rain event; however, there can be some icing at the onset early tomorrow; especially, south of the PA/MD border include the N/W suburbs of DC. By late tomorrow, enough milder air will arrive for plain rain to fall in the DC-to-Philly-NYC corridor and this can become a soaking rain event from Friday night into Saturday. The departure of the first storm will result in an influx of another cold air mass at the end of the weekend and this could set the stage for some snow and/or ice later Monday as the next storm system closes in on the area.
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There will be a couple of storms to deal with over the next several days with the first one becoming predominately a plain rain event. However, there can be an initial burst of light precipitation as early as tomorrow morning and it could be cold enough for some freezing rain and/or ice pellets - possibly impacting the AM commute. A second storm can bring some snow and/or ice to the region early next week. High pressure will stay in control of our weather today providing us with some sunshine, but it’ll be quite cold for this time of year. Temperatures will only manage to climb into the upper 30’s this afternoon and the normal high for this date is 48 degrees (at Reagan National Airport). Low pressure will form quickly in the southeast US on Friday and it’ll ride right up the coast impacting us from tomorrow well into the day on Saturday. High pressure will return for the second half of the weekend, but it’ll be quite breezy and cold on Sunday. Another storm is likely to impact the region from later Monday into Tuesday and this one should have enough cold air around to produce some snow and/or ice in the region - at least at the onset.
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Snow in the region should wind down by the mid-to-late morning and there will be some clearing this afternoon as high pressure moves closer from the Ohio Valley. That high will push overhead tonight and temperatures will drop the lower 20’s for lows by early Thursday. Strong low pressure will move up along the east coast as we head towards the weekend and this is likely to produce heavy rainfall around from late Friday into early Saturday.
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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 this afternoon and colder air will push in during the late day and 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 the mid or late morning on Wednesday, but it can mix with rain again as it is winding down. Accumulations are likely to average out in the range of a coating to three inches with the lower amounts in the District 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 into the 60’s 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 middle 30’s in the DC 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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