A broad southwesterly flow of milder air has formed on the backside of strong high pressure which is now situated over the western Atlantic Ocean. This high pressure system had its origins last week over the central part of Canada, but has drifted southeastward over the past few days. The milder air mass worked its way into the eastern states on Tuesday and it’ll stay warmer-than-normal here into the day on Friday. A strong cold front will pass through the Mid-Atlantic region on Friday night paving the way for much colder weather this weekend and signs point to additional colder-than-normal outbreaks for the Mid-Atlantic region during the second half of March. One final note about the upcoming weekend, it will be time once again to turn the clocks ahead early Sunday morning.
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Clockwise winds on the back side of a strong high pressure system over the western Atlantic Ocean have produced a broad flow of warmer air from the southwest-to-the northeast and temperatures will respond noticeably here this afternoon. This warm up will intensify later in the week and it'll stay above normal right through Friday. A late week cold frontal passage, however, will usher in much colder air for the weekend and temperatures are likely to be confined to the 40's for afternoon highs.
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High pressure that first formed over central Canada has drifted southeastward over the past few days and it will emerge out over the western Atlantic Ocean by tomorrow. As a result, clockwise winds on the back side of the high have produced a broad flow of air from the southwest-to-the northeast and temperatures have responded noticeably higher across the central Plains and Upper Midwest. This warm up will expand into the eastern states by tomorrow afternoon and it’ll stay on the warm side of normal for much of the remainder of the week. In fact, 60+ degrees is likely here on Wednesday, Thursday and Friday before a late week frontal passage ushers in colder air for the weekend.
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A cold frontal system dropped through the region early yesterday and it ushered in a colder air mass that will stick around right through the upcoming weekend. In addition to the chill, winds will continue to a factor from the northwest causing it to feel even colder than the actual ambient air temperature. This colder air mass is anchored by strong high pressure across southern Canada which will remain in control through Sunday at which time it’ll begin to shift eastward. Looking ahead, once this high pressure system shifts to the western Atlantic Ocean early next week, a big warm up will develop in the eastern half of the nation. This warm up will first develop across the central US and then it'll expand into the eastern US. Much warmer conditions will arrive here in the Mid-Atlantic region for the Tuesday/Wednesday/Thursday time frame with highs likely near 60 degrees by the middle of next week.
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A strong and cold Canadian high pressure system will dominate the weather scene over the next few days in much of the northeastern quadrant of the nation including the Mid-Atlantic region. The days will feature colder-than-normal temperatures for early March and persistent NW winds will make it feel even colder than the actual ambient air temperature. Once this high pressure system shifts off the east coast early next week, a strong southwesterly flow of air will set up on its backside and begin a significant warm up in the central US on Sunday/Monday which will then expand into the eastern states on Tuesday/Wednesday/Thursday.
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A cold frontal system dropped through the region last night and has ushered in a colder air mass that will stick around right through the weekend. In addition to the noticeable cool down from yesterday, winds will become a big factor later today and we'll have stiff NW winds into the early part of the weekend. This colder air mass is anchored by strong high pressure across southern Canada which will remain in control through Sunday. Looking ahead, once this high pressure system shifts to the western Atlantic Ocean early next week, a big warm up will develop - first across the central US and then it'll expand into the eastern US. Much warmer conditions will arrive here for the Tuesday/Wednesday/Thursday time frame with highs likely near 60 degrees by the middle of next week.
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High pressure will build into the southern Mid-Atlantic region today and the result here will be a noticeable improvement in temperatures and much less wind compared to the past 36 hours or so. A cold frontal system will drop southward through the region tonight and it’ll usher in a colder air mass for the remainder of the week and for the upcoming weekend. This colder air mass will be anchored by strong high pressure across southern Canada and this system will be in control from tomorrow through Sunday. Looking ahead, a big warm up is coming to the eastern half of the nation next week with noticeable warming likely arriving here by Tuesday and Wednesday.
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An Arctic front whipped through the region last night and it’ll stay quite cold today in the Mid-Atlantic region along with continued rather strong NW winds. The winds will die down tonight as high pressure builds into the area and this system will dominate the weather scene for the rest of the week.
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The rain that we have experienced since early yesterday will wind down this morning and an Arctic front will blast through the region late in the day. As a result, winds will kick up noticeably later today and they will be very strong tonight with gusts possible to 50 mph or so. In addition, temperatures will drop sharply in the overnight hours bottoming out near 20 degrees and wind chills will be considerably lower. After a cold and sunny day on Tuesday, temperatures will moderate at mid-week under continuing mostly sunny skies.
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Don’t be surprised to see some snowflakes later tonight in some of the northern and western suburbs along the DC-to-Philly-to-NYC corridor as moisture pushes into a relatively cold and dry air mass (dew points in the teens). In fact, there can be a coating to an inch or so in some of the nearby northern and western suburbs of Philly and NYC and also in some of the far northern and western suburbs of DC.
Rain will be the dominate precipitation type on Saturday morning in the DC-to-Philly-to-NYC corridor before it winds down at mid-day and there will be significant rainfall on Sunday and Sunday night. An Arctic front will then blast through the Northeast US/Mid-Atlantic region on Monday and the winds will kick up noticeably later in the day and continue quite strong on Monday night. In addition, the plunge in temperatures will be quite dramatic in this short, but intense Arctic cold air outbreak and there can even be a few snow squalls in the Northeast US upon its arrival.
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