The week started off with below-normal temperatures in much of the Mid-Atlantic region thanks to plenty of cloud cover and a light low-level easterly breeze. As is often the case this time of year, the break in the heat will be rather short-lived. High pressure pushes off the east coast at mid-week and the peak in this week’s heat and humidity in the Mid-Atlantic region may come on Thursday after persistent southwesterly flow develops on the backside of the high. After that, the potential exists for some heavy rainfall from Thursday night into the upcoming weekend as a frontal system stalls in the region with weak wind flow aloft and a very moist overall environment.
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It’ll turn out slightly warmer today compared to Monday with the return of sunshine following the partly sunny start to the week. High pressure will stay in control through tomorrow night and then it pushes offshore on Thursday allowing for a surge in heat and humidity in the northeastern states. In fact, temperatures could soar well into the 90’s on Thursday afternoon and then a slow-moving front will approach from the northwest on Thursday night and Friday. This late week frontal system is likely to stall out near the coast and result in shower and thunderstorm activity from Friday into Saturday - some of which can be heavy at times.
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A decent start to the work week in terms of temperatures which will be slightly below-normal for the first day of August, but it’ll turn hotter during the second half. A warm front pushes north through the region on Tuesday and then a weak cool front follows on Tuesday night. The second half of the week will feature temperatures climbing to the middle 90’s and it’ll become more humid on the back side of high pressure pushing off the coast to our east.
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A cool front will move slowly across the area later today into tonight and with it will come another chance for showers and thunderstorms…some of the PM storms can be strong-to-severe. Downpours early last night brought a lot of rainfall to some areas in a short period of time. The front should clear the coast by early tomorrow and a comfortable air mass will push into the Mid-Atlantic region for the weekend. Temperatures will be confined to the 80’s today and right into the early part of next week. Hot weather will develop in the central states by the middle of next week and a surge of heat and humidity can return here later next week.
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A cool front will approach the region later today and then move slowly across the area during the next 24-36 hours. As such, it’ll stay unsettled around here with the chance of showers and thunderstorms later today, tonight and on Friday though much of the time will be rain-free. The cool front will push far enough to the south and east by the weekend to allow for the arrival of a comfortable air mass into the Mid-Atlantic region. After a flirtation with the 90 degree mark later today, temperatures should generally be confined to the 80’s for afternoon highs on Friday, Saturday and Sunday and even into the early part of next week.
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A meandering frontal system and a couple of upper-level disturbances will keep us unsettled over the next couple of days with a shot at some shower and thunderstorm activity from late today into Thursday. Another chance of showers and thunderstorms will come on Thursday night and Friday with the next cool front and it looks like that system will clear through here by early Saturday. As such, a comfortable air mass should push into the Mid-Atlantic region for both Saturday and Sunday with high temperatures confined to the 80’s on both days.
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There have been many frontal passages in recent weeks across the Mid-Atlantic region that have produced showers and thunderstorms and, in some cases, severe weather. While these showers and thunderstorms have often been quite “numerous” to the south of the PA/MD border, they have usually been “isolated-to-scattered” across Pennsylvania, New Jersey and New York City. These “hit or miss” variety showers and thunderstorms are frustrating many residents to the north of the PA/MD border with lawns now beginning to turn brown in many areas. There will be additional chances of showers and thunderstorms in coming days, but still no guarantees; especially, to those north of the Mason-Dixon Line.
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Temperatures will actually stay below-normal today in most spots of the Mid-Atlantic region with highs, for example, confined to the lower 80’s in the DC metro area where normal highs at DCA are about 90 degrees. Given the general west-to-east air flow in the upper part of the atmosphere, the front that came through last night will have difficulty pushing too far to the south and east over the next 24 hours or so and is likely to stall out in the southern Mid-Atlantic region. As such, it’ll stay unsettled around here for the remainder of the work week with additional chances for showers and thunderstorms to go along with overall rather seasonal temperatures. Another cool front will head this way late in the week and all signs point to this next one having enough “push” behind it to bring another comfortable air mass this way for the upcoming weekend.
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The first extended heat wave of the summer in the Mid-Atlantic/Northeast US will break today with the arrival of a frontal system that is currently producing showers and embedded thunderstorms in upstate Pennsylvania. The chance of showers will increase in the I-95 corridor by the early-to-mid afternoon and while not every location will get hit, a strong-to-severe thunderstorm is possible right into the late evening hours. Much more comfortable conditions will take place on Tuesday with below-normal temperatures and another cooler-than-normal air mass is destined to come this way for the upcoming weekend. The past weekend featured some excessive heat in the DC-to-Philly-to-NYC corridor with a run to the 100 degree mark on both days.
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The first extended heat wave of the summer in the Mid-Atlantic region will break today with the arrival of a frontal system that will generate showers and perhaps a strong-to-severe thunderstorm or two. It’ll remain pretty hot today though not as excessive as the past weekend and it’ll continue to be very humid and quite breezy. Much more comfortable air will arrive in the region by tomorrow with temperatures likely confined to the low-to-mid 80’s for highs on Tuesday afternoon…actually below-normal for this time of year. The front stalls out nearby on Tuesday and its proximity for the remainder of the week will keep it quite unsettled here to go along with seasonal temperatures. One final note, the high temperatures for Saturday and Sunday in the I-95 corridor were as follows: Philly: 98/99 degrees, DCA: 96/94 degrees, Central Park (NYC): 95/95 degrees and LaGuardia Apt. (NYC): 97/98 degrees.
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