High pressure will sit on top of the Mid-Atlantic region today and provide us with spectacular weather considering the time of year with comfortable conditions and plenty of sunshine. This high pressure system will shift to our south and east on Thursday and this will open the door for hot air to return to the area from the Midwest at the end of the work week. A weakening cold front will approach later Friday and it could generate some shower and thunderstorm activity in the Mid-Atlantic region on Friday night. Hot weather will continue this weekend in the NYC metro region with high temperatures way up in the 90’s as the dissipating frontal system will not be able to provide us with any relief.
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High pressure and a new air mass will push into the region today following the late night frontal passage and overall humidity levels should drop noticeably during the day. Tomorrow promises to be a nice day for mid-July with comfortable temperatures and humidity levels and then it’ll turn very warm again on Thursday afternoon, but humidity should remain relatively reasonable for one more day. Hot weather will return on Friday and continue this weekend with high temperatures likely in the 90's each day. A frontal passage on Friday night could spark a few showers and thunderstorms as the weekend begins and - given the frontal passage - 100 degrees no longer looks achievable this weekend.
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We are now halfway through the summer season time period of June, July and August and temperatures have averaged at slightly above normal levels in the I-95 corridor (Philly: +0.9° June, +1.9° July; DCA: +1.0° June, +1.1° July; NYC: +0.8° June, +0.4° July) and there is no reason to believe this overall warmer-than-normal pattern will stop anytime soon despite a nice break coming here for the mid-week. In fact, after a break in the heat and humidity on Tuesday, Wednesday and Thursday, excessive heat appears to be headed our way for the weekend and this one could last right into early next week. Indeed, the nation as a whole will be quite hot by the weekend which is rather typical weather for a summer featuring an El Nino-to-La Nina transition in the tropical Pacific Ocean. The nice break in the heat and humidity for the mid-week time period will be brought about by the passage late tonight of a cold frontal system that will generate scattered strong-to-severe thunderstorms in the DC-to-Philly-to-NYC corridor during the 3-9 PM time period with possible damaging wind gusts.
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Today will be quite hot and steamy, but Wednesday promises to be very pleasant with comfortable temperatures and humidity – in between a strong cold frontal passage. Temperatures today will climb well into the 90’s along the I-95 corridor and, as a strong cold front approaches, the chances will grow for late day and evening showers and thunderstorms and some of the storms can be strong. The best chance for strong thunderstorms will be in the northern and western suburbs of the metro area as there will be a tendency for some weakening of this frontal system as it slides closer to the coast. High pressure pushes back into the region on Tuesday following the frontal passage and humidity levels should drop noticeably during the day. Nice weather on Wednesday and Thursday will be followed by another hot spell for Friday, Saturday and Sunday as temperatures climb back into the 90’s.
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Today will be another hot one in the Mid-Atlantic region with high temperatures this afternoon well up in the 90's in most locations along the I-95 corridor. A weak frontal system will slide through later today and most likely cross the area rain-free, but an isolated shower or thunderstorm cannot be ruled out this afternoon. Following the frontal passage, overall humidity levels may actually drop some later today making the heat a little easier to take and then high temperatures will be slightly reduced this weekend compared to today along with scattered showers and thunderstorms. A stronger front arrives early next week and this should continue the chances for showers and thunderstorms by late Monday and Tuesday.
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High pressure situated off the east coast in the familiar “Bermuda High” position will continue to produce humid weather in the Mid-Atlantic region and the heat will become quite noticeable today with high temperatures reaching the 90 degree mark. The threat for scattered showers and thunderstorms will continue today as a weak frontal boundary grudgingly approaches from the Upper Midwest. The heat will continue on Friday as we close out the work week, but the chances for showers and thunderstorms will diminish tomorrow. That frontal system will dissipate by the weekend providing us with little relief in temperatures and humidity; consequently, quite warm and muggy conditions are likely to continue on Saturday, Sunday and Monday along with an isolated shower or thunderstorm. Looking longer-term, the unfolding hotter-than-normal weather pattern in the Mid-Atlantic looks like it'll continue for much of the time from mid-July into the autumn season and the Atlantic Basin will soon see increasingly active tropical weather.
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High pressure has shifted off the east coast and from this “Bermuda High” position it will promote an increasingly moist low-level flow of air from the Deep South into the Mid-Atlantic region. At the same time, a weak cold front will slowly slide eastward into the Mid-Atlantic region over the next couple of days and this combination of increasing humidity and an approaching frontal system will increase chances for showers and thunderstorms as early as late today or tonight. The hottest two days of the week are likely to be tomorrow and Friday when temperatures should reach 90+ degrees. The front is likely to stall nearby this weekend and that will likely keep it somewhat unsettled around here into early next week.
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High pressure will shift offshore today and the clockwise flow around it will promote low-level southwesterly winds. This wind shift will act to push warmer and more humid air into the Mid-Atlantic region from the Deep South over the next couple of days. In fact, much of the second half of the week will feature high temperatures flirting with the 90 degree mark much of the time. At the same time this high pressure system shifts off the east coast, a weak cold front will slide slowly eastward across the Upper Midwest and this combination will increase our chances for showers and thunderstorms as the week progresses.
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High pressure builds into the region today and the new work week will start off rather warm, but comfortable for this time of year. The high pressure will slip off the coast on Wednesday and it’ll turn hotter with high temperatures likely flirting with the 90 degree mark at mid-week. A couple of weak frontal systems will increase the chance for showers and thunderstorms later in the week.
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A significant rain event is in the offing for the Mid-Atlantic region over the next 24 hours. A warm front will edge into the area from the Ohio Valley and low pressure will ride along its boundary zone. As a result, occasional rain will fall from late today or early tonight into tomorrow, some of it can be heavy at times, and thunderstorms may mix in. High pressure will return for Wednesday and Thursday and temperatures should climb to rather hot levels for much of the second half of the week.
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