A weakening cold frontal system will clear the area today and the next few days will be somewhat of an improvement over the past few in terms of the high temperatures that we have been experiencing. In fact, high temperatures for much of the rest of the week will be much closer to the 90 degree mark rather than the 95 or higher, but the chance of showers and thunderstorms will not go away any time soon and more heavy rain is likely.
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The good news is that today will be the last day of the recent extended heat wave in many parts of the Mid-Atlantic region; especially, north of the PA/MD border. The bad news is that there will be strong-to-severe thunderstorms affecting parts of the Mid-Atlantic region before we get some relief around here.
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It’ll stay quite hot and humid today as a cold front approaches from the northwest trailing a low pressure system that will pass by well to our north. As a result, the threat for showers and thunderstorms will continue this afternoon and evening and some of the storms that forms may be strong and some of the rain can be heavy at times. Temperatures and humidity levels will turn more reasonable for the second half of the week following the cold frontal passage.
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It’ll stay hot and humid for the next couple of days, but some relief comes by mid-week. Low pressure will trail a cold front through the region later tomorrow and it’ll turn a tad cooler for the second half of the week. The frontal system is likely to generate more storms for the region later tomorrow and some of the rain can be heavy at times.
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The excessive humidity and high heat will stick around through the upcoming weekend and there will be isolated showers and thunderstorms. While isolated, these showers and thunderstorms will tend to be slow-moving and - given the high available moisture levels in the atmosphere - heavy rainfall could be the result from any individual shower or storm. Slight relief in the high heat is likely to arrive early next week.
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High pressure off the east coast in the classic “Bermuda high” position is pumping tropical moisture into the Mid-Atlantic region and the next few days will be quite oppressive with high heat and excessive humidity. In fact, heat indices - which are a measure of the discomfort caused by heat and humidity - will likely reach over 100 degrees during the next few days in much of the Mid-Atlantic region. This air mass is so humid with high precipitable water content that even though showers and thunderstorms will be spotty, any shower or storm that forms will be slow-moving and can produce heavy rainfall amounts in a short period of time.
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The heat index is a measure of discomfort as a result of the combined effects of temperature and humidity and it will reach well over 100 degrees during the next few days. In fact, this stretch of very uncomfortable weather should continue right through the weekend in what will turn out to be the longest period of high humidity so far this summer season. A deep plume of tropical moisture is pushing into the Mid-Atlantic region and it will stick around for the next several days. High pressure has pushed off the east coast and the clockwise flow of air around it has turned our low-level winds to a south-to-southwest direction and this is pushing tropical air northward along the eastern seaboard. In addition to the heat and humidity, the overall weather pattern for the next few days will be quite unsettled with scattered showers and thunderstorms and any shower or storm can produce heavy rainfall.
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High pressure has shifted off the east coast and this has opened the door for hot and very humid air to flow into the Mid-Atlantic region from the southeastern states. Low-level winds have turned around to primarily a south-to-southwesterly direction and moisture-laden air is now easily riding up along the eastern seaboard. As the humidity levels and temperatures increase, so will our chances for showers and thunderstorms. In fact, this will become a daily threat for the rest of the work week and through the weekend as well and some of the storms can produce heavy rainfall.
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High pressure will shift off the east coast today and this will open the door for hotter and more humid air along with a daily shot at showers and thunderstorms for the second half of the week and the weekend. Low-levels winds will shift to a south-to-southwest direction later today as the high moves eastward and moisture-laden air will ride northward along the eastern seaboard from the Gulf of Mexico over the next few days. High temperatures from mid-week into the weekend should top out at 90 degrees or slightly higher and the humidity will become quite noticeable.
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High pressure has built into the region from the Great Lakes and it’ll shift offshore on Tuesday. A warm front will lift northward into our region by mid-week and then another frontal system will slowly drop southward through the Northeast US late in the week bringing hot, unsettled weather for much of the second half of the week.
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