Temperatures will modify some today in the Mid-Atlantic region with the approach of a warm front and there can be a bit of snow, ice and/or rain at times. Right on its heels, a cold front will pass through the area on Wednesday and its passage will ensure moderately cold conditions for the remainder of the week and weekend. In addition, the winds will pick up at mid-week with gusts to 30 mph or so and it’ll stay quite breezy on Thursday to go along with the moderately cold conditions. The weekend will likely present another storm system for the Mid-Atlantic region and it could feature a mixed bag of rain, sleet and/or snow during the second half.
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The polar jet has dominated the scene in recent weeks typically extending all the way from western Canada into the northeastern US, but the sub-tropical jet is starting to show some life. This change in the overall weather pattern raises the prospects for moderation in temperatures across the northeastern states, some well-needed precipitation across many of the western states, and for the formation of storm systems that take a southern route across the southern states. By mid-week, a storm will head into California with some rainfall in low-lying areas and snow for mountainous areas, and then this low pressure system will re-emerge over the south-central states by the early part of the weekend...all of which will be aided by an activated sub-tropical jet stream.
The southern storm system will take a turn to the northeast later in the weekend and head towards the Ohio Valley, but it will become increasingly influenced by strong ridging centered over the Hudson Bay region of Canada. As such, the northward progression of the surface low will grind to a halt over the Ohio Valley and the action will shift to the east so that by the end of the weekend, strong low pressure is liable to be located somewhere near the eastern seaboard. Temperatures may be borderline later this weekend in the I-95 corridor so this region could become a “battle zone” with respect to precipitation type with snow favored to the north and west and rain to the south and east.
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After a bitter cold weekend, the new work week starts off with plenty of Arctic cold in the Mid-Atlantic region with numerous single digit temperatures being observed. Temperatures modify on Tuesday and then a cold front arrives at mid-week assuring cold weather for the second half of the week, but not the extreme cold just experienced. The weekend will bring another storm threat to monitor with the possibility of mixed precipitation during the second half.
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Intense cold this weekend with powerful and potentially damaging winds…
The combination of a clipper low pressure system and its associated cold front will produce snow showers in the area late today and tonight and there can be brief heavier snow bursts. Small accumulations are likely on the order of a coating to an inch and there can be slippery spots on the roadways. After the passage of the cold front, an Arctic air mass will plunge into the Mid-Atlantic region from eastern Canada leading to a bitter cold weekend. This Arctic air mass is the real deal, had its origins on the Siberian side of the North Pole, and will not have the usual modifying effects of crossing over the relatively warm Great Lakes. In addition to the bitter cold, biting winds will become a major factor on both weekend days with gusts of up to 55 mph producing dangerously low wind chill levels of well below zero and raising the possibility of power outages in some areas.
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An Arctic air mass will plunge into the Mid-Atlantic and Northeast US this weekend moving almost directly southward from the frozen tundra region of eastern Canada. Actually, this incoming Arctic air mass had its origins several days ago on the other side of the North Pole and was transported into North America from Siberia in a “cross-polar” overall wind pattern. The cold front at the leading edge of this bitter cold air mass will be quite active with strong support in the upper part of the atmosphere. As a result, numerous snow showers are likely on Friday night, and there can be bursts of heavier snow mixing into the picture...small accumulations and slick spots on the roadways are on the table. In addition to the bitter cold this weekend, biting and potentially damaging winds will become a major factor with gusts to 50+ mph raising the prospects for power outages in some areas. The combination of bitter cold air and powerful winds will result in dangerously low wind chill levels from later Saturday to early Sunday with apparent temperatures well below zero at times in many areas.
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An Arctic air mass is headed to the Mid-Atlantic region for the weekend with its origins on the Siberian side of the North Pole. This Arctic blast will be directly discharged to us from eastern Canada as compared with the more conventional “northwest-to-southeast” route that has air traveling over the Great Lakes meaning there will be less chance for modification. The cold front at the leading edge of this bitter cold air mass will be quite active on Friday night with strong support in the upper part of the atmosphere, leading to snow showers and perhaps a heavier snow squall. Small accumulations of a coating to an inch or so are likely on Friday night…watch for slippery spots. In addition to the bitter cold this weekend, winds will become a major factor on both days with gusts up to 50 mph producing dangerously low wind chill levels of well below zero in many locations.
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An Arctic air mass is headed to the Mid-Atlantic/Northeast US for the weekend with its origins on the Siberian side of the North Pole. This Arctic blast will be directly discharged to us from eastern Canada as compared with the more conventional “northwest-to-southeast” route that travels over the Great Lakes. The cold front at the leading edge of this bitter cold air mass will be quite active with strong support in the upper part of the atmosphere, likely leading to some accumulating snow on Friday afternoon and evening, and perhaps a few snow squalls will mix into the picture. In addition to the bitter cold, biting and potentially damaging winds will become a major factor on both weekend days with gusts of 50+ mph producing dangerously low wind chill levels of well below zero in many locations.
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Temperatures climbed above freezing on Tuesday for the first time in awhile in many spots and this allowed for some melting of the “snowcrete” that has been stuck in place in recent days. Yesterday’s “warmup” is the good news…the bad news is that much colder air returns by tonight and we’re headed for a bitter cold weekend in the Mid-Atlantic region. The next weather system of note will be a strong Arctic cold front that arrives later in the day on Friday and it can produce some snow during the afternoon and evening hours…perhaps even a snow squall. The passage of the late week Arctic front will result in a direct discharge of Arctic air from eastern Canada and temperatures are likely to be confined to the mid-to-upper teens for afternoon highs. In addition, the winds will be powerful on both Saturday and Sunday as the result of a very tight pressure gradient across the northeastern states and wind chill levels will be below zero at times. Another clipper system will drop southeast on Sunday from the Great Lakes to the Mid-Atlantic and it can produce snow showers in parts of the area.
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Weak low pressure will head in this direction today and it can produce some snow around here tonight with small accumulations on the table of a coating to an inch. The next weather system of note will be a strong Arctic cold front that arrives at the end of the week and it can produce some snow in the Mid-Atlantic region during the afternoon and evening hours on Friday. The passage of the late week Arctic front will result in a bitter cold weekend in the Philly metro region with temperatures likely to be confined to the teens for afternoon highs on both Saturday and Sunday. In addition, the winds will be powerful on both days as the result of a tight pressure gradient across the northeastern states and the combination of the bitter cold and strong winds will produce dangerously low wind chill values. Looking ahead, it does appear that, for the first time in awhile, milder weather might just make it all the way into the northeastern states by the second half of next week.
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Punxsutawney Phil saw his shadow this morning suggesting there will be six more weeks of winter, and I certainly have faith in all Pennsylvania prognosticators. One thing is for sure...the next 7 days will feature more in the way of well below-normal temperatures, and the upcoming weekend will be bitterly cold across the Mid-Atlantic/Northeast US with a direct discharge of Arctic air from eastern Canada. The Arctic front at the leading edge of this brutally cold air mass can produce snow showers and squalls on Friday, and powerful winds will add to the misery on both weekend days. The big cities from DC-to-Boston will likely experience single digit lows once again during the weekend and wind chills will be at dangerously low levels on both days.
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