High pressure has shifted off the coast and this has opened the door for a southerly flow of air to bring in more humid air from the southern states. As a result, the threat for showers and storms will return today and any storm that forms can produce heavy rainfall and frequent lightning. The threat for showers and storms will continue during the next couple of days as a frontal system approaches the region. More comfortable air will arrive this weekend and temperatures may hold in the lower 80's for highs on both days. In fact, the prospects for another spectacular Sunday are quite high with plenty of sunshine anticipated along with low humidity and comfortable temperatures.
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Humidity levels will rise a bit today as high pressure begins a shift to off the Northeast US coastline. Higher humidity levels and an approaching frontal system will make it more unsettled around here for the second half of the work week. As a result, the chance for showers and thunderstorms will return on a daily basis, but no widespread heavy rain event is likely in the near term. Also, no excessive heat is likely as we progress through the first few days of August.
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The new work week gets off to a pretty nice start today with comfortable humidity levels for the end of July and plenty of sunshine. High pressure has taken control of our weather following the departure of the weekend storm which pounded the region from DC-to-Atlantic City, NJ, but left areas to the north of the PA/MD border virtually unscathed. Humidity will become more noticeable on Tuesday and then the second half of the week will become more unsettled with the threat for scattered showers and thunderstorms.
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Our late week heavy rain event is now underway in and around the DC metro region with torrential rain already falling in some areas. Low pressure is now forming along a stalled out frontal boundary zone and it will intensify as it heads towards the Mid-Atlantic coastline over the next 12 hours. The rain will gradually spread from southwest-to-northeast over the next few hours likely reaching the Philly metro region by early tonight. The heaviest rainfall amounts during this unfolding storm will likely be in the DC-Delmarva Peninsula-southern NJ corridor where perhaps 4-7 inches can accumulate in spots by tomorrow morning. The New York City metro region will be largely spared of the heavy rainfall and there will be a sharp drop off in the total rainfall amounts from south-to-north between southern and central Pennsylvania.
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More rain is headed towards the DC metro region and the heaviest amounts are likely to take place from later this morning into tomorrow morning. Low pressure will form along a stalled out frontal boundary zone and push towards the Mid-Atlantic coastline over the next 24 hours and rain should overspread the area from southwest-to-northeast and strong thunderstorms can be mixed into the picture. Given the recent heavy rainfall, flash flooding will be a serious concern during this upcoming event. Temperatures will remain fairly warm today with highs at or slightly above the 80 degree mark, but stiff NE winds on Saturday – typical of a nor’easter - could confine temperatures to the lower 70's to go along with the rainfall. Much improvement will take place on Sunday as the storm pulls away from the Mid-Atlantic coastline.
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Ingredients are coming together for a storm to hit parts of the Mid-Atlantic region from later tomorrow into Saturday and it should produce some heavyrainfall, possible strong thunderstorms, and winds at the coastline of more than 40 mph. This unfolding scenario is somewhat analogous to wintertime nor’easters in the Mid-Atlantic region with strong surface low pressure near the coastline, chilly high pressure anchored to the north and west, and vigorous energy aloft. While there can be scattered showers and thunderstorms later today and tonight, the main event from this developing storm should take place from later tomorrow into Saturday morning.
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There is growing likelihood for yet another heavy rain event in the Philly metro region and it could include some strong thunderstorm activity as well. High pressure has pushed off the Northeast US coastline and a warm front will approach the area later today from the southwest. This front will stall out over the region on Friday and allow low pressure to track right along its boundary zone. While there can be a few showers and thunderstorms later today and tonight, the main rain event around here will come later Friday into Saturday with occasional heavy rain and possible strong thunderstorms. Given the already-saturated grounds in some spots, flash flooding may become a serious concern during this storm. The rain looks like it will linger through much of of the day on Saturday and perhaps even into Sunday; especially, along coastal sections as this unfolding July nor'easter will be a slow mover.
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There is growing likelihood for yet another major rain event in the DC-to-Philly-to-NYC corridor and this could easily result in flash flood watches and warnings for much of the region at the end of the work week. High pressure will push off the Northeast US coastline on Thursday and a warm front will approach the area later in the day from the southwest. This front will stall out over the region on Friday and allow low pressure to track right along its boundary zone. This low pressure system will have tremendous support in the upper atmosphere and it could ultimately turn out to be an uncommon late July nor’easter.
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There is potential for yet another heavy rain event at the end of the work week and it could include strong-to-severe thunderstorm activity as well. High pressure will dominate the scene around here into Thursday, but then a warm front will approach the area from the southwest. This front will stall out over the region by Friday and allow low pressure to track right along its boundary zone. While there can be a few showers and thunderstorms later Thursday and Thursday night, the main event will come on Friday and Friday night with numerous showers and thunderstorms likely. Some of the rain is likely to be heavy at the end of the week and some of the storms can reach strong-to-severe levels. The rain could even linger into the first part of the weekend; especially, near coastal sections. High pressure will eventually win out by later in the weekend and temperatures should remain on the comfortable side both weekend days.
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High pressure across the Northeast US will take control of our weather for the next couple of days, but a shower or two cannot be ruled out for mid-day today in parts of the region. A more comfortable air mass has pushed into the area following the passage of a frontal boundary zone and we’ll actually see high temperatures likely holding in the 80’s for the remainder of the week. Another round of showers and thunderstorms is possible later Thursday into Friday and this could turn out to be another heavy rain event.
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