A tremendous amount of rain fell late yesterday and last night across southeastern PA, east-central PA and much of southern and central NJ with nearly four and a half inches recorded at Philly Intl Airport. All of this was as a result of extremely slow-moving shower and thunderstorm cells in an overall weak wind field in the atmosphere along with a tropical air mass firmly entrenched in the region. For today, an unusually strong low pressure system for this time of year will move towards northwestern Pennsylvania and an associated strong surface cold front will slide towards the I-95 corridor. At the same time, a powerful wave of energy in the upper part of the atmosphere will move over the Mid-Atlantic region. As a consequence, there can be an outbreak of severe thunderstorms from later this afternoon into tonight that could impact the DC-to-Philly-to-NYC corridor with damaging wind gusts, hail and perhaps even a few isolated tornadoes and the localized flooding threat will continue as well in any downpour. Once the strong cold front clears the coast by early tomorrow, the threat for rain will wind down, humidity will drop noticeably, and the winds will pick up from a northwesterly direction gusting to 30 mph or so. High pressure will build into the area later tomorrow and it may just stay in control for most of the upcoming weekend, but more showers and thunderstorms are possible around here by Sunday night and Monday.
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A nearly stationary frontal system draped across the Mid-Atlantic region will continue to act as a focal point for showers and thunderstorms today and tonight and any shower or storm can produce heavy rainfall as they will be slow movers. Given the already well-saturated grounds, any heavy rainfall can quickly result in localized flooding conditions. Ingredients may be coming together for a severe weather outbreak in the I-95 corridor later tomorrow afternoon and early tomorrow night. An unusually strong low pressure system for mid-June will move over the western part of the Mid-Atlantic by later tomorrow and a strong surface cold front will slide towards the east coast. At the same time, a powerful wave of energy in the upper part of the atmosphere will move over the Mid-Atlantic region. As a result, there can be an outbreak of severe thunderstorms late on Thursday that could impact the DC-to-Philly-to-NYC corridor. Once the strong cold front clears the coast by early Friday, the threat for rain will end, humidity will drop, and the winds will pick up noticeably from a northwesterly direction. High pressure may stay in control for much of the weekend, but more rain is possible here by early next week.
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A nearly stationary frontal boundary zone is combining today with tropical-like humidity and upper-level energy to generate more showers and thunderstorms in the Mid-Atlantic region and this threat for rain will continue tonight and Wednesday as well. Some of the rain that falls will be heavy and some of the storms that form later today will reach strong-to-severe levels potentially resulting in damaging wind gusts and even isolated tornadoes. Given the already well-saturated grounds, any heavy rain can quickly produce localized flooding conditions with a couple of inches possible in a short period of time. Later in the week, the combination of a strong surface low pressure system and associated cold front with powerful energy aloft will likely result in a severe weather outbreak in the I-95 corridor from later Thursday into Thursday night before a break in the action arrives for Friday and Saturday.
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The threat continues today for heavy showers and possible strong-to-severe thunderstorms. A nearly stationary frontal system draped across the Mid-Atlantic region will continue to act as a triggering mechanism for showers and thunderstorms and some of the rain that falls will be heavy at times. Given the already well-saturated grounds, any heavy rainfall can quickly result in localized flooding conditions and some spots could receive an additional few inches on top of what has already fallen in recent days. A strong front may finally push through the region later Thursday night/early Friday and this could pave the way for a break in the action for later Friday and the upcoming weekend. That frontal passage, however, may come with the threat for severe weather late Thursday into Thursday night before windy and drier conditions arrive here on Friday.
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Torrential rain is possible here later today and early tonight as a nearly stationary frontal system hangs around the Mid-Atlantic region contributing to a very moist and unstable atmosphere. There is also the threat for strong-to-severe thunderstorm activity in this type of pattern which could result in damaging wind gusts to go along with heavy rainfall. The threat for heavy rain and possible strong-to-severe thunderstorms will likely repeat on Tuesday afternoon and evening and perhaps again on Wednesday and Thursday. Given the already well-saturated grounds, localized flooding is indeed a serious concern this week in this unfolding extremely wet stretch of weather. A break in the action may arrive later Friday and for at least part of the upcoming weekend before a return to the threat for rain again by the early part of next week.
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The pressure gradient between a low pressure system to our north and high pressure to our south will tighten today and this will lead to increasingly strong winds gusting to 35 mph at times. The high pressure to our south will maintain control of the weather on Saturday as it shifts offshore, but then a frontal system will close in on the area during the latter stages of the weekend. This front will stall out in or near the region setting the stage for a stormy period from Sunday to Thursday that will feature quite warm and humid conditions as well.
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Low pressure that is generating rain in the region will push north of here later this morning, but that will not be the end of the threat for rain. A cold front approaches the region later today and will cause scattered PM showers and thunderstorms. Any rain this morning associated with the low pressure system can be heavy at times and the same goes for any late day showers and thunderstorms associated with the cold frontal passage. High pressure builds into the area on Friday and it’ll combine with low pressure to the north to produce strong winds on Friday to go along with cooler-than-normal temperatures and comfortable humidity levels. The high shifts off the coast on Saturday and this will allow more moisture to push in this direction for the early part of next week. The threat for showers and thunderstorms that will return on Sunday will stick around on Monday and Tuesday in the Mid-Atlantic region.
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High pressure will shift offshore today, but it’ll remain close enough for another pleasant mid-June day in the Mid-Atlantic region. The weather will go downhill tonight as a warm front and associated low pressure system lift northward along the east coast leading to an increase in clouds and the threat for late night rain and thunderstorms and some of the rain can be heavy at times. The rain will continue into the morning hours on Thursday and then we'll experience scattered PM showers and thunderstorms as the surface low pressure pushes to the north of here and a cold front arrives. High pressure will build into the region for the last day of the work week and comfortable, but windy weather will prevail on Friday. It'll turn warmer on Saturday and stay rain-free, but clouds return on Sunday as will the chance for showers and thunderstorms and that threat for rain continues early next week.
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A cold front passed through the region earlier today and this will usher in a noticeably less humid air mass to go along with increasing amounts of sunshine and plenty of wind. Temperatures tonight will drop into the comfortably cool middle 50’s for late night lows and Wednesday promises to remain quite comfortable for the middle of June. Another cold front will approach the region on Thursday and it can cause some shower and thunderstorm activity ahead of it and yes, some of this next event can feature heavy rainfall at times. High pressure will follow for the end of the work week and much of the upcoming weekend.
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The new work week gets off to a wet start in the Mid-Atlantic region as low pressure treks across the Great Lakes. A warm front will lift north through the region today and then a cold front will arrive early Tuesday. The combination of the two fronts will bring occasional showers and PM thunderstorms to the region through tonight and some of the rain will fall heavily at times. Given the already well-saturated grounds, any downpour can result in localized flooding conditions. High pressure builds into the area for later tomorrow and Wednesday with noticeably less humid air, but more showers are destined for later in the week.
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