The combination of a very moist air mass, a southward-advancing cold front, and an unstable atmosphere is resulting in more shower and thunderstorm activity for the Mid-Atlantic region. Any shower or thunderstorm that hits a given area later today/early tonight can produce flash flooding conditions given the general slow movement and the abundance of available moisture. Late yesterday and early last night, the “bulls eye” of the heaviest rainfall took place in Chester County, PA, but today’s threat will extend southward to southern New Jersey, the Delmarva Peninsula, and the DC metro region.
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It’ll remain very humid today in the Philly metro region and there will again be the chance for PM showers and thunderstorms. Any shower or thunderstorm later today can produce heavy rainfall and localized flooding conditions as they will be slow movers and there is a tremendous amount of available low-level moisture. A cold front will cross the region later tonight and usher in slightly cooler air for the late week; however, it will stall just to our south. As low pressure systems move across the stalled out frontal boundary zone, the chance of showers and thunderstorms will continue in the Mid-Atlantic region through Friday, but at least part of the upcoming weekend looks rather promising.
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It’ll remain very humid today in the Philly metro region and there will be the chance for late day/evening showers and thunderstorms. Any shower or thunderstorm later today can produce some heavy rainfall as they will likely be slow movers and there is an abundance of available low-level moisture. A cold front will cross the region tomorrow night and usher in slightly cooler air for the late week; however, it will stall just to our south. As low pressure systems move across the stalled out frontal boundary zone later in the week, the chance of showers and thunderstorms will continue in the Mid-Atlantic region.
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Our first extended stretch of very warm and humid weather will continue for the next few days with afternoon temperatures not far from 90 degrees right through mid-week. The main weather maker is a strong high pressure system over the western Atlantic Ocean which is pumping in the very warm and humid air mass from the southeastern states into the Mid-Atlantic region. The chance of showers and thunderstorms will exist each day through this very warm period given the high levels of low-level moisture. The highest chance for rain will come during the PM hours over the next few days and any shower or thunderstorm can produce some heavy rainfall. It turns cooler later in the week following the passage of a cold front.
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An upper-level trough of low pressure remains to our west this morning and it’ll help to keep it unsettled around here today with additional showers and thunderstorms possible. High pressure will build into the eastern states early this weekend and then move to a classic summertime “Bermuda high” location by early next week. As a result, hot, increasingly humid, and downright summer-like weather is likely here from the weekend through the middle of next week with daily highs at or above the 90 degree mark.
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The combination of a moist air mass, surface frontal systems, and a slow-moving upper-level trough is bringing more rainfall to the Mid-Atlantic region and there can be downpours later in the day and again tonight which could result in some localized flash flooding. In addition, there is the potential for strong-to-severe thunderstorm activity ahead of an advancing cold frontal system. The upper-level trough will still be to the west of the I-95 corridor on Friday leading to an unsettled day and the possibility of additional showers and thunderstorms. High pressure builds across the eastern states this weekend and a classic summertime “Bermuda high” setup is likely to result in hot, increasingly humid and summer-like weather for the period from Sunday-to-Wednesday with daily high temperatures at or above the 90 degree mark in the I-95 corridor.
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The combination of a moist air mass, surface frontal systems, and a slow-moving upper-level trough is bringing more rainfall to the Mid-Atlantic region. One batch of rain has already moved through the area associated with a northward-moving warm frontal system. Additional showers are coming later today into tonight and there is the threat for some strong-to-severe thunderstorm activity. Any rain later today and tonight can fall heavily at times. The threat for showers and storms will continue on Friday and then high pressure will build into the eastern states by early this weekend. This system will then move into a classic summertime “Bermuda high” position and the result here will be a hot and summer-like stretch of weather from Sunday into Wednesday with increasingly uncomfortable humidity levels.
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The combination of an increasingly moist flow of air, two surface frontal systems, and a slow-moving upper-level trough will raise the prospects for downpours in the Mid-Atlantic region on Thursday and Thursday night and also the chance for strong-to-severe thunderstorm activity. The rain may actually come in two different waves – one late tonight/early Thursday associated with a warm frontal system and a second late tomorrow and tomorrow night associated with a cold front. High pressure builds across the eastern states this weekend and a classic summertime “Bermuda high” setup is likely to result in hot, humid and summer-like weather for Sunday, Monday and Tuesday with high temperatures at or above the 90 degree mark in the I-95 corridor.
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A surface frontal system will combine with increasingly moist air and a slow-moving upper-level trough to bring us more rainfall on Thursday and Thursday night. The potential does exist for downpours in this type of pattern and strong-to-severe thunderstorm activity is on the table as well. Looking ahead, it looks like it’ll get very warm later this weekend and early next week with highs likely at or above 90 degrees on Sunday, Monday and Tuesday as high-pressure ridging takes over in the eastern states.
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The weekend was very chilly in the Mid-Atlantic region and it was accompanied by a soaking rain event which was actually beneficial (despite its poor timing) due to the recent dry spell. It looks like more significant rainfall is on the table for Thursday and Thursday night and it could include strong-to-severe thunderstorm activity. The combination of an increasingly moist flow of air, surface frontal system, and a slow-moving upper-level trough will raise the prospects for the rain and potential severe weather in the Mid-Atlantic region.
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