*The coldest night of the season so far is on its way and many suburban locations will experience a frost/freeze for the first time this fall.* October was a warmer-than-normal month in the Mid-Atlantic region (PHL +5.8 degrees, DCA +5.5 degrees, NYC +4.1 degrees) and overnight lows rarely, if ever, dropped into the 30's in most suburban locations...that will change not only later tonight, but also during the next few late nights as well. An upper-level disturbance can produce occasional showers around here today, but skies should clear this evening and colder air will push into the region following the passage of a secondary cold frontal system. Temperatures should stay below-normal right through the upcoming weekend.
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High pressure took control of the weather in the Mid-Atlantic region on Sunday and the new work week will start off with plenty of sunshine, but with cool, breezy conditions. A cold front will slide through the region during the morning without much fanfare (i.e., dry), but its passage will usher in much colder air compared to recent weeks. There will be a couple of chances for the first frost/freeze of the season in the Mid-Atlantic region this week with likely the best chance coming late Wednesday night/early Thursday.
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Today’s storm in the Mid-Atlantic region is living up to its potential with strong, persistent E-SE winds, some serious coastal flooding, and occasional heavy rainfall that will produce 1-3 inches and isolated higher amounts. The added twist this afternoon and evening will be the likelihood for some strong thunderstorms which should rotate from the southwest-to-northeast and could include damaging wind gusts along with downpours.
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Another storm system will impact the region today and it will generate strong winds, periods of rain and possibly a strong thunderstorm or two. Rainfall amounts are likely to end up in the 1-3 inch range from this system with isolated higher amounts and - given the already pretty well saturated grounds - flash flood watches have been issued for much of the region. Winds will become quite strong from an E-SE direction as the low pressure system approaches and potentially can gust into the 40-50 mph range. With the expected long time period of an onshore flow during this storm, coastal flooding is a serious concern. The coastal flooding threat is not only for the Delmarva's Atlantic Ocean coastline, but also with respect to the Chesapeake Bay and tidal Potomac; especially, during tonight's high tide. It remains quite unsettled on Saturday with lots of clouds remaining and a continuing shower threat. The weather should settle down some for Sunday although a shower cannot be completely ruled out and Monday should turn out to be a dry and cool day.
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The next storm for the Mid-Atlantic region will arrive on Friday and this system will bring another soaking rainfall and strong E-SE winds for an extended period of time. As a result of the expected long and strong onshore flow of air with this next storm, coastal flooding is a big concern in all susceptible areas of the Mid-Atlantic.
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High pressure will build into the area today, but its impact will be rather short-lived. Another storm system will reach us on Friday and it will generate more significant rainfall in the Mid-Atlantic region likely in the 1-3 inch range. In fact, flash flood watches may have to be issued for this storm given the already pretty well saturated grounds from the rains of earlier this week. In addition to the rain, winds will become quite strong on Friday from a southeasterly direction and potentially gusting into the 40-50 mph range. It remains quite unsettled on Saturday with lots of clouds and a continuing shower threat, but the weather should settle down some for Sunday and especially Monday.
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An active weather pattern continues today with a powerful nor’easter finally starting to pull away from the New England coastline and a vigorous upper-level low over Texas that has resulted in an outbreak of severe thunderstorms and tornadoes in the Deep South. This same upper-level low will push to the east over the next 24 hours and contribute to a windy and rainy end to the week in the Mid-Atlantic/NE US.
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An off-shore storm will shift away from the region today and there will be some sunshine, but its proximity will continue to result in windy conditions in the Mid-Atlantic. High pressure will build into the area on Thursday, but then another storm will form near the eastern seaboard from Friday into Saturday. This next system is associated with the energy left behind from the storm that pounded the west coast on Sunday and Monday and it could bring more significant rain and wind to the Mid-Atlantic region. Looking ahead, a cold front is likely to push our way by the middle part of next week.
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A nor’easter will intensify off the southern New England coastline today and then it’ll take a loop back towards Long Island later tonight which will prolong its impact around here into tomorrow. An occasional shower is possible here this morning and mid-day and could become more numerous late in the day and early tonight. The bigger impact from the intensifying off-shore storm will be the winds which will increase over the next few hours and potentially gust past 40 mph later in the day and also during the night. Another low pressure system can have an impact around here later in the week as energy from yesterday’s west coast storm reaches the eastern seaboard.
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A powerful storm system has pounded the west coast during the past 24 hours or so and a strong Nor’easter is about to unfold just off the east coast. This developing Nor’easter will impact much of the Mid-Atlantic/Northeast US from later tonight into Wednesday morning with flash flooding type rains in some areas and potentially damaging wind gusts; especially, along coastal sections. The development of the east coast storm will wait for the arrival of a surface cold frontal system which will push eastward this afternoon from the Ohio Valley into the Mid-Atlantic. This frontal system can result in some strong-to-severe thunderstorm activity along the I-95 corridor from later today into early tonight following a day of near record warmth.
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