High pressure over the western Atlantic will pump much warmer air into the Mid-Atlantic region today on southwesterly winds and we’ll experience afternoon temperatures well up in the 80's.. A cool front will arrive late tonight and there can be showers and thunderstorms ahead of it anytime from later today through the late evening hours. This front will stall nearby on Saturday and low pressure will drift along the boundary zone on Sunday producing more clouds in the region, a threat of showers, and overall cooler conditions. It’ll turn even cooler during the early part of next week and an overall damp weather pattern will continue through at least mid-week. Elsewhere, a tropical system is very likely to form this weekend over the southwestern Atlantic – the first of the 2020 Atlantic Basin tropical season - and it may very well contribute to the formation of a coastal storm in the Mid-Atlantic region during the middle of next week.
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The east coast of the US will be an interesting area to monitor over the next week or so in terms of the weather as we’ll see a tropical system just east of Florida in the near term and then perhaps a coastal low by the end of next week which could impact the Mid-Atlantic. Low pressure is now forming over the Florida Straits and it’ll intensify over the next 24-48 hours as it makes a move to the northeast over the relatively warm waters of the southwestern Atlantic Ocean. This system may come uncomfortably close to the US east coast in coming days and may play a role in the development of a coastal low by the end of next week in the Mid-Atlantic region.
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High pressure has pushed off the eastern seaboard and this will result in some dramatic temperatures changes over the next 24 hours or so. Temperatures today will jump well up into the 60’s as low-level winds turn to a more southerly direction and then as southwesterly flow intensifies on Friday, they’ll climb to the low-to-mid 80's for afternoon highs. A cool front will cross the region on Friday night perhaps with a few showers and an embedded thunderstorm and then it’ll stall just to our south as we begin the weekend. By Sunday, low pressure will form along this stalled-out frontal boundary zone and clouds will return to the region along with the threat of showers and it’ll turn cooler as we close out the weekend. Meanwhile, a tropical system will form this weekend over the southwestern Atlantic and slide to our east; however, it may indirectly contribute to the development of a mid-week coastal low.
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High pressure will push off the east coast by tomorrow and this will result in some dramatic temperatures changes at week’s end. Temperatures will become warmer on Thursday afternoon as low-level southwesterly flow develops and then they’ll soar on Friday to summer-like values in the 80’s. With the significant warm up at the end of the work week will come an increased chances of showers and thunderstorms late on Friday and during Friday night.
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Another chilly day and night is in store for the region following the passage of a cold frontal system late yesterday and frost will be possible towards morning in N/W suburban locations with clear skies and light winds. High pressure will push off the east coast by Thursday and this will result in some dramatic temperatures changes at week’s end. Temperatures will become warmer on Thursday as southwesterly flow develops in the lower part of the atmosphere and then they’ll soar on Friday to summer-like values in the lower 80’s. With the significant warm up at the end of the work week will come an increased chances of showers and thunderstorms and the summer-like warmth will continue into the upcoming weekend.
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Another cold shot is coming to the Mid-Atlantic/Northeast US for the first half of the week and it could lead to more record or near record low temperatures and the possibility of frost during the next couple of late nights. As with the remarkable cold air outbreak this past weekend, attention should be paid to sensitive vegetation with this unusual late season chill. The end of the week will bring about a dramatic turnaround and summer-like warmth is quite likely on Friday as a “Bermuda-high” type pattern develops over the eastern US and Atlantic Ocean.
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The remarkable cold of the past weekend will give way to summer-like warmth at week’s end, but we have another cold air mass to go through before we get there. A cold front will cross the region today as low pressure deepens over New England. As a result, temperatures tonight and tomorrow night will fall back into the 30’s for overnight lows and frost will be possible by early Tuesday and again by early Wednesday. As another low pressure system approaches towards the end of the week, our temperatures will soar on both Friday and Saturday to near the 85 degree mark for highs and there will be a chance of showers and thunderstorms on both days.
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A remarkable cold air outbreak is coming to the region for Friday night and Saturday and it will be accompanied by a rain-changing-to-snow event in many interior sections of the Mid-Atlantic/Northeast US. The weather will become quite a bit more active later today as a strong cold front advances this way from the Upper Midwest and low pressure begins to develop over the Tennessee Valley. This low pressure system will push along the southeastward-advancing cold frontal boundary zone and rain is likely to return to the region during the afternoon and evening hours. As colder air wraps into the system tonight, the rain is likely to change to snow in a good part of the Mid-Atlantic/Northeast US; especially, across interior higher elevation locations of upstate PA, NY and New England where accumulations are possible. In fact, there can be a changeover from rain-to-snow showers later tonight all the way into the suburban locations well to the north and west of DC. This low pressure system will intensify dramatically by the time it reaches the Gulf of Maine on and a deepening pressure gradient will result in powerful winds to go along with the unusual cold. Winds on Saturday can gust to 50 mph or so raising the chance for scattered power outages. Looking ahead, the overall weather pattern that has resulted in multiple cold air outbreaks from Canada into the central and eastern US during the past several weeks is likely to finally break down during the third week of May, but we’ll have to endure some pain before we get to those expected warmer-than-normal conditions.
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A remarkable cold air outbreak is coming to the northeastern quadrant of the nation for Friday night and Saturday and it will be accompanied by a rain-changing-to-snow event for many interior sections of the Mid-Atlantic/Northeast US. This cold blast is likely to result in some of the coldest daily temperatures ever recorded both at the surface and in the upper atmosphere and, in some cases, monthly temperature records may be set. In addition, some spots might see their latest measurable snowfall in the Friday night/Saturday time period. Some interesting notes…in Philadelphia, there has not been a temperature in the 30’s on May 9th or later in more than fifty years (1966) and it could happen on both Saturday (9th) and Sunday (10th) mornings. In Buffalo, the predicted temperature of -40°C this weekend at the 500 millibar level would shatter the previous record of -35.7°C for the entire month of May. In Baltimore, there has not been a measurable snowfall in the month of May since 1872 and the latest on record there is May 9th (1923).
In addition to the cold and potential snow, winds will become an important factor as well on Saturday with gusts past 50 mph on the table in the Mid-Atlantic/Northeast US and this will raise the chance for scattered power outages. Looking ahead, the overall weather pattern that has resulted in multiple cold air outbreaks from Canada into the central and eastern US during the past several weeks is likely to finally break down during the third week of May, but we’ll have to endure some pain before we get to those expected warmer-than-normal conditions.
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Quite an amazing outbreak of cold air will arrive on Friday night and the cold frontal passage may actually be accompanied by a rain-changing-to-snow event in part of the Mid-Atlantic region – perhaps even in the higher elevation locations to the north and west of Route I-95. Saturday will turn out to be a very windy day with gusts possible to 50 mph and an unusually cold day for this time of year with temperatures perhaps 20+ degrees below normal. In addition to the wind and the cold, there can be a rain or snow shower on Saturday as the atmosphere will be very unstable given the extremely anomalous upper-level low pressure system that will be sitting over the Northeast US. While Sunday, Mother’s Day, will remain colder-than-normal and get off to a very cold start, the afternoon will become much more bearable as there should be far less in the way of wind when compared to Saturday and some sunshine. Looking ahead, the overall weather pattern that has resulted in cold air outbreaks for the central and eastern US in recent weeks finally looks like it may break down during the third week of May.
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