High pressure stays in control into mid-week at which time it’ll shift offshore and open the door for hotter and more humid air to flow into the Mid-Atlantic region. The July 4th holiday on Thursday will feature very warm and humid conditions and the chance of PM showers and thunderstorms. The threat of showers and thunderstorms will continue on Friday and Saturday as well to go along with the very warm and humid conditions as a cool front slowly advances in this direction from our northwest. Elsewhere, Hurricane Beryl is now a category 5 storm over the Caribbean Sea and headed to Jamaica on Wednesday and the Yucatan Peninsula by the end of the week.
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Following the overnight passage of a surface cool front, the short work week will start off quite comfortable with low humidity values and a northerly breeze. High pressure stays in control into mid-week at which time it’ll shift offshore and open the door for very warm and more humid air to flow in this direction. The July 4th holiday will feature very warm and humid conditions and the chance of showers and thunderstorms. The threat of showers and storms will continue on Friday and Saturday as well along with very warm and humid conditions featuring an approaching cool front from northwest of here.
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A surface cool front pushed off the east coast early yesterday paving the way for a comfortable air mass with moderate humidity levels that will stick around through the day today. Overall humidity levels will begin to climb later tonight and it’ll be a noticeable and uncomfortable factor on both weekend days. We’ll also have to deal with the chance of showers and thunderstorms on both weekend days as a couple different frontal systems impact the region.
A warm front will advance from the south on Saturday and this can produce showers and thunderstorms any time from late tonight through tomorrow night...any thunderstorm can reach strong-to-severe levels. A cool front will then drop to the south and east towards our area late in the weekend and it too can generate showers and thunderstorms in the area...any thunderstorm late Sunday can reach strong-to-severe levels. Following the passage of the late weekend cool frontal system, another comfortable air mass will push into the Mid-Atlantic for the early part of next week.
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A surface cool front is pushing off the coast this morning and its passage has cleansed the atmosphere of the high heat and humidity from yesterday and it’ll lead to improving conditions all along the I-95 corridor. Clouds will give way to sun and overall humidity levels will come down today with the onset of a northwesterly flow of air in the lower levels of the atmosphere. It’ll stay rather comfortable through tomorrow and then the humidity builds up again late Friday night and Saturday ahead of the next cool frontal system. That front can cause another round of showers and thunderstorms in the Mid-Atlantic region this weekend and it’s passage will be followed by another comfortable air mass for the early part of next week.
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Several ingredients will come together late today and tonight to raise the chance of severe thunderstorm activity in the Mid-Atlantic region. The combination of an approaching surface cool front, higher heat and humidity, a strong low-level jet, wind shear, and an upper-level trough will result in showers and thunderstorms from later today into tonight and any thunderstorm can reach severe levels. The severe weather threats include damaging wind gusts, heavy rainfall, and large hail. In addition, given the expected formation of strong wind shear, there will also be the potential of isolated tornadoes.
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Several ingredients will come together later today and early tonight to produce the chance of severe thunderstorm activity in the Mid-Atlantic region. The combination of an approaching cool front, higher heat and humidity, a strong low-level jet, and a vigorous upper-level trough will result in showers and thunderstorms from later this afternoon into the late evening hours and any storm can reach severe levels with potential damaging wind gusts, heavy rainfall, and large hail. In addition, strong wind shear is expected to develop in this environment and this ingredient can result in isolated tornadoes; especially, across the northern Mid-Atlantic regions of NE PA and NW NJ. The surface cool front will move offshore by early tomorrow morning paving the way for lowering humidity levels on Thursday to go along with decreasing cloud cover. Another cool front can bring somewhat of a repeat performance of this type of weather on Saturday night and Sunday with the chance of additional showers and strong-to-severe thunderstorms.
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Several ingredients will come together late tomorrow and tomorrow night to produce the chance of strong-to-severe thunderstorm activity in the Mid-Atlantic region. The combination of an approaching cool front, higher heat and humidity, a strong low-level jet, and an upper-level trough will likely result in showers and thunderstorms from later tomorrow into tomorrow night and any storm can reach strong-to-severe levels. The main threat should be damaging wind gusts; however, given the expected strong wind shear, there will also be the potential of isolated tornadoes; especially, over northeast PA and NW NJ.
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A cool front passed through the Mid-Atlantic region early Monday and ushered in a comfortable air mass featuring noticeably lower humidity levels than recent days and they’ll stay in the moderate zone today. It’ll turn hotter and more humid on Wednesday ahead of the next cool frontal system and that front is likely to produce afternoon and evening showers and thunderstorms in the Mid-Atlantic region. Some of the PM thunderstorms on Wednesday can reach strong-to-severe levels. More comfortable air returns to the region on Thursday following the passage of the mid-week front and it stays comfortable into the weekend. Another front is likely to bring another round of showers and thunderstorms to the Mid-Atlantic region on Saturday night and Sunday.
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A cool front passed through the Mid-Atlantic region in the overnight hours and has ushered in a much more comfortable air mass featuring noticeably lower humidity levels. The breeze will be a factor today gusting up to 30 mph or so out of the northwest. It turns warmer on Tuesday and hot on Wednesday ahead of the next cool front. Temperatures at mid-week will climb back into the 90’s and there can be afternoon and evening showers and thunderstorms. More comfortable air returns to the region later in the week on the heels of the mid-week frontal passage.
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The most uncomfortable part of this current heat spell will come today, tomorrow and Sunday as there will be an increase in overall humidity levels and the heat as well. In addition, the chance of showers and thunderstorms will begin to increase later today and the threat will continue through the weekend and early part of next week. The increasing potential for rain over the next few days will come about with the increase in overall humidity levels and the interaction with a couple of frontal systems. One such back door front will enter the picture later today from our northeast and then a second cool front will approach from the northwest late on Sunday. Any thunderstorm that forms during the next few days can bring heavy rainfall and produce locally damaging wind gusts. Looking ahead, little in the way of relief is expected next week with temperatures likely back to near 90 degrees on Monday and Tuesday for afternoon highs and then into the 90’s by the middle of next week.
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