Today will be the last for awhile in which high temperatures can reach the 90 degree mark as an important pattern change is about to take place in the Mid-Atlantic region and the result will be torrential rainfall and possible strong-to-severe thunderstorms. A storm system will push towards the Mid-Atlantic coastline over the next 12-24 hours with rain and slow-moving thunderstorms pushing in later today and continuing into early Friday. Some of the rain will be heavy at times from this low pressure system and some of the thunderstorms can reach strong-to-severe levels with gusty winds, flash flooding potential, and even isolated tornadoes.
On top of that, this type of weather pattern featuring a stalled out frontal boundary zone might just lead to a repeat performance over the weekend with more soaking rainfall possible associated with a second low pressure system - perhaps Saturday night into Sunday. The strong likelihood for copious amount of clouds and occasional rainfall over the next several days will help to contribute to a reduction in high temperatures so that they will be confined to the 80’s from tomorrow into next the middle of next week.
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A frontal system has stalled nearby and this boundary zone will act as a pathway for low pressure systems during the latter part of the week and weekend. As a result, the weather will remain very unsettled around here with multiple chances of showers and thunderstorms. This type of weather pattern is likely to produce drenching rainfall at times and there can be thunderstorms on the strong side during the next few days which can generate flash flooding and gusty winds. As far as temperatures are concerned, the combination of copious amounts of clouds and occasional rainfall will help to contribute to a reduction in high temperatures to the 80’s from Friday into early next week.
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Today is another hot day in the Mid-Atlantic region and tomorrow should feature high temperatures at or above the 90 degree mark, but a storm system pushing in from the Deep South at the end of the work week is likely to bring soaking rainfall to the area and it will help to break the back of this current heat wave. This low pressure system is likely to produce showers and thunderstorms in the local region from late tomorrow night into the day on Friday with heavy rain possible at times and some of the thunderstorms can be on the strong side. In addition, this type of unsettled weather pattern featuring a stalled out frontal boundary zone might just lead to a repeat performance over the weekend with more soaking rainfall possible associated with a second low pressure system. The strong likelihood for copious amount of clouds and occasional rainfall at the end of the work week and upcoming weekend will help to contribute to a noticeable reduction in temperatures so that highs are quite likely to be confined to the 80’s in coming days.
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A frontal system will stall nearby to our south later today and this boundary zone will act as a pathway for low pressure systems during the latter part of the week and weekend. As a result, the weather will remain quite unsettled around here and there will be multiple chances for showers and thunderstorms as we head to the end of the week and weekend - and some of the rain is likely to be heavy at times. As far as temperatures are concerned, they will slacken off by Friday as we'll be dealing with lots of clouds and occasional rainfall. In fact, temperatures should hold in the 80's on Friday, Saturday and Sunday and even into the early part of next week.
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It'll remain hot today in the NYC metro region with afternoon temperatures again reaching the 90's. Overall humidity is on the high side this morning, but it will tend to drop off some during the afternoon hours. It’ll stay pretty hot on Wednesday as well, but temperatures will tend to drop off a little later in the week although the chances of afternoon and evening showers and thunderstorms will resume for much of the second half of the week and the weekend.
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Today may turn out to be the worst day of all with respect to the recent hot spell as humidity levels are currently at tropical levels and this is raising “heat indices” to oppressive levels. "Heat indices” are a measure as to how uncomfortable overall conditions are to the average person as a result of the combination of heat and humidity. In addition to the overbearing heat and humidity, the combination of an upper-level wave of energy, a surface-level frontal system, and excessive heat and atmospheric moisture raises the prospects for strong-to-severe thunderstorm activity late this afternoon and evening along the I-95 corridor. There is a danger that some spots will get pounded by multiple storms during this event moving along in a "training" pattern; especially, across Pennsylvania, New Jersey and southern New York.
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A line of strong-to-severe thunderstorms passed through parts of the Mid-Atlantic region in the wee hours of the morning and there is the threat for another such line later today and early tonight. Today will be another very hot day with highs way up in the 90's along with oppressive humidity levels and, as a frontal system approaches from the northwest, new showers and thunderstorms will break out across central and western sections of the Mid-Atlantic and then head in our direction. The most likely timetable for any shower and thunderstorm activity in our region is the rather usual time period for summertime around here; namely, the late afternoon and evening hours of about 4 to 10pm. The hot weather will continue on Tuesday and Wednesday, but humidity amounts should be reduced some following the passage of today's approaching frontal system. By later in the week, temperatures will drop off a bit, but there will also be a daily threat for showers and thunderstorms.
As far as the weekend heat is concerned, high temperatures in the I-95 corridor reached well into the 90's on both days, but no records were set. Here are the specifics for a few selected cities along I-95 in terms of high temperatures for Saturday and Sunday: PHL 97, 95; BWI 98, 94: DCA 98, 97 and NYC 96, 94.
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Hot weather is in store for the Mid-Atlantic region from today through early next week in what is "climatologically-speaking" the peak time for temperatures in the summer season. A frontal system will approach the area later today and it will likely set off a round of showers and thunderstorms in the I-95 corridor anytime between 2 and 8pm and some of the storms can be on the strong side. The passage of the front will provide us with no relief from the heat this weekend and temperatures will soar into the 90's on both days. Another frontal system will approach late Monday bringing with it more in the way of showers and thunderstorms by late in the day or at night. The first couple of days of the new work week will continue to feature hot conditions and high temperatures well up in the 90's.
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High pressure will shift to our south and east today and this will open the door for hot air to return to the region on Friday from our southwest. A weakening cold front will approach later tomorrow and it could generate scattered showers and thunderstorms in the Mid-Atlantic region. Excessive heat will take place this weekend in the I-95 corridor as the dissipating frontal system will not be able to provide us with any relief in the heat. The excessive heat will continue right into the early part of next week in what is climatologically-speaking the hottest time of the summer season.
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We are now slightly more than halfway through the summer season period of June, July and August and temperatures have averaged at above normal levels in the I-95 corridor (Philly: +0.9° June, +2.2° July; DCA: +1.0° June, +1.2° July; NYC: +0.8° June, +0.7° July) and there is no reason to believe this overall warmer-than-normal pattern will stop anytime soon despite the nice break we are experiencing here at mid-week. In fact, after this current break in the heat and humidity, excessive heat appears to be headed our way for the Friday, Saturday, Sunday, Monday time frame and this one could actually result in some isolated 100° readings in the Mid-Atlantic region. 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.
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