The week will start off with comfortably warm temperatures in the Mid-Atlantic region, but an approaching cold front will likely result in scattered showers and thunderstorms during the afternoon and/or evening hours...some of the storms can be on the strong side. Another cold front will pass through at mid-week ushering in more comfortable air for the northeastern part of the nation. At the same time the Northeast US/Great Lakes enjoys comfortable weather conditions, much of the western US will experience excessive heat as upper-level high pressure ridging expands and intensifies over that part of the nation. Elsewhere, it looks like the Gulf of Mexico will feature a tropical system by late this week or early this weekend and it may ultimately head towards Louisiana.
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A southward-moving cold frontal system arrived here yesterday and has stalled-out in the region allowing for additional showers today and maybe another thunderstorm or two...some of the rain can be heavy at times. The front will finally clear through the region by tomorrow and as high pressure builds in we'll experience warmer conditions on Saturday and some sunshine. The next cold front will then approach late in the weekend and likely generate some shower and thunderstorm activity for late Sunday and Sunday night. Looking ahead, a rather refreshing and cooler-than-normal air mass will push into the Northeast US by the middle of next week at the same time the Southwest US experiences some extreme heat. This pattern change will be the result of a vigorous upper-level low that will drop southeastward from Canada into the Northeast US at the same time strong high pressure ridging builds into the southwestern states. In addition, there is likely to be the first tropical activity of the young Atlantic Basin season by later next over the Gulf of Mexico.
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A cold front is inching towards the area this morning and it will stall out nearby resulting in an increased chance of PM showers and thunderstorms in the DC metro region. In fact, the threat exists for some very heavy rainfall around here later today and tonight given the combination of weak winds, very moist air, and the surface cold frontal boundary zone and this threat will extend eastward to the Delmarva Peninsula. The threat for rain will continue on Friday as well and then the weekend should get off to a pretty decent start. The next cold front could bring some shower and thunderstorm activity back here by late Sunday/Sunday night.
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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 DC metro region and there will again be the chance for showers and thunderstorms. Any shower or thunderstorm later today can produce heavy rainfall and localized flooding 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 some of the upcoming weekend looks rather promising.
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It’ll remain very humid today in the DC metro region and there will be the chance for 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 high temperatures close to 90 degrees on a daily basis. 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 through this very warm period given the high levels of low-level moisture with the highest chance for rain coming during the PM hours. It turns somewhat cooler later in the week following the passage of a cold front.
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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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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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