There are two big weather stories unfolding for the Mid-Atlantic region for the next few days with the potential of severe thunderstorms and torrential rainfall later today and tonight as the remains of Barry pass through the region and then the hottest weather of the summer so far in the Friday through Sunday time frame. An already very warm and moist atmosphere will get even more unstable later today and tonight as a trough of low pressure associated with what was once tropical cyclone Barry passes through leading to numerous showers and thunderstorms.
Once this large tropical moisture field pushes away from the area, an atmospheric blow torch will setup and cause temperatures to soar on Friday in the I-95 corridor and it’ll stay excessively hot and humid this weekend with a run to 100 degrees possible during this stretch. There can be scattered showers and storms late Sunday with a weak frontal system and then more showers and storms on Monday associated with an even stronger frontal system which will usher in cooler air by next Tuesday. In fact, the remainder of July looks much more pleasant across the eastern half of the nation with normal-to-below normal temperatures and we could very well look back on this Friday-to-Sunday heat wave as the worst of the summer in the Mid-Atlantic region.
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A disturbance will bring more heavy rain to the region; especially, during the morning hours and there can be a thunderstorm mixed in as well. Watch for some serious localized flooding conditions and as always, "turn around, don't drown". Building high pressure will result in some clearing later tonight and the next couple of days will feature plenty of sunshine and warm conditions. The high pressure system will shift to the east of here by later Wednesday and a cold front will cross the area later Thursday into Friday and there can be some strong thunderstorm activity associated with the late week frontal system. Elsewhere, low pressure now situated over the Southeast US is likely to drop southward to over the Gulf of Mexico and it could very well intensify into a tropical storm later in the week.
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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 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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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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There will be numerous bands of showers and thunderstorms today in the Mid-Atlantic as the combination of strong surface low pressure, a warm front and a cold front impacts the region. One line of storms in particular could reach the I-95 corridor region later in the afternoon and early evening hours with strong-to-severe thunderstorm activity and any these cells can produce damaging wind gusts, hail and flooding rainfall. Following the passage of the cold front, temperatures will drop dramatically in the overnight hours and winds will become very strong from a northwesterly direction. The strong winds will continue on Saturday to go along with cooler conditions and partly-to-mainly sunny skies.
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Deep upper-level low pressure will intensify over the next 24 hours as it slowly grinds its way across the southern states. The combination of this strong wave of energy in the upper atmosphere and an influx of very moist tropical air will result in a severe weather threat later today and tonight in the Deep South. In addition to the severe weather threat which includes the potential for hail and isolated tornadoes, heavy rainfall is likely later today in the southern states and localized flooding is a concern as grounds are well saturated. The threat for heavy rainfall and severe weather will shift to the eastern seaboard late tomorrow and tomorrow night with the possibility of strong-to-severe thunderstorm activity extending from the Mid-Atlantic region to Florida.
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Deep upper-level low pressure will intensify over the next couple of days as it slowly grinds its way across the southern states. The combination of this strong wave of energy in the upper atmosphere and an influx of very moist low-level air will result in a severe weather threat today in the region from Texas-to-Kansas and later tomorrow across Mississippi, Alabama and perhaps as far north as Tennessee. In addition to the severe weather threat which includes the potential for large hail and tornadoes, heavy rainfall is likely later today in the south-central states and then on Thursday across the southeastern US. Any heavy rainfall can result in localized flooding as much of the eastern half of the nation is experiencing well-saturated ground conditions. The heavy rainfall and severe weather threat will reach the eastern seaboard on Friday afternoon and evening with the possibility of strong-to-severe thunderstorms from the Mid-Atlantic region to Florida.
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Yesterday at this time temperatures were in the 70’s across the Denver metro region and today they’re in the 30’s, a blizzard warning is in effect and the game between the Rockies and Braves has been called off hours ahead of time. A major storm will bring a variety of impacts to the Rockies, central and northern Plains from later today into Thursday that will include heavy snowfall, whiteout conditions, and wind gusts as high as 60 mph. The bullseye region for this springtime blizzard will extend from northeastern Colorado-to-central Minnesota and some spots in this corridor can see accumulations of 1-2 feet during this upcoming event.
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A major storm will bring a variety of impacts to the Rockies, central and northern Plains from later tomorrow into Thursday that will include heavy snowfall, whiteout conditions, and winds as high as 60 mph. The bullseye region for this springtime blizzard will likely extend from northeastern Colorado-to-central Minnesota and some spots in this corridor can see accumulations of 1-2 feet during this upcoming event.
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