Strong high pressure ridging continues to be centered over the central states and active weather has developed in northwest flow across its outer perimeter region. As a result, there will be occasional showers here and scattered thunderstorms are likely as well…some of the rain that falls in this unsettled period can be heavy at times. Temperatures today are likely to reach 80 degrees for afternoon highs and could climb into the middle 90’s on Friday following the passage of a warm front and ahead of the next cool front.
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A lot is going on in the world of weather highlighted by multiple tropical systems, an intense heat wave with very high humidity levels anchored by very strong upper-level high pressure ridging, and very active weather in the “ring of fire” around the outer perimeter of that same high pressure system. On the tropical scene, Tropical Storm Franklin is pounding away today at Haiti and the Dominican Republic and once it bypasses this high-terrain Caribbean island of Hispaniola into the open waters of the Southwest Atlantic, it will intensify into a hurricane with a decent chance of attaining “major” categorization of 3 or higher. Meanwhile, the moisture associated with the remnants of Tropical Storm Harold which pounded southern Texas earlier this week will douse the Four Corner states during the next couple of days. Finally, there is the chance that a tropical systems forms this weekend in Caribbean Sea and it could move north next week and impact portions of the Southeast US.
Elsewhere, very strong ridging of high pressure over the nation’s midsection is anchoring an intense heat wave from the Upper Midwest to the Gulf coast. This heat wave is made worse by very high humidity levels that have featured dew points as high as 80 degrees in some spots. On the outer perimeter of this very strong high pressure ridge is a region that I like to refer to as the “ring of fire”, there is some very active weather that is bringing heavy showers and strong thunderstorms to the eastern Great Lakes. This “ring of fire” activity will spread to the south and east bringing heavy showers and strong thunderstorms to the Mid-Atlantic/Northeast US during the next couple of days.
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High pressure that originated in Canada will move overhead today generating another comfortable day in the Mid-Atlantic region with pleasant temperatures and low humidity levels. While the comfortable weather pattern continues here in the Mid-Atlantic region, strong upper-level ridging in the middle of the country is resulting in a blistering heat wave from the Upper Midwest to the Gulf coast that is accompanied by very uncomfortably high humidity levels. The weather here turns much more unsettled again beginning late tonight and continuing into the weekend with the renewed threat of showers and thunderstorms…some of the rain can be heavy at times.
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A cool front passed through the region early this morning and temperatures will average some ten degrees cooler this afternoon as compared with Monday. High pressure that originated in Canada will control the weather for the next couple of days and a developing upper-level trough later in the week will bring a return to somewhat unsettled weather in the Mid-Atlantic region.
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A cool front will push through the region tonight and our flirtation with the 95 degree mark for afternoon highs will be just a one-day affair. Following the passage of the cool front, the next couple days will feature more seasonal temperatures as high pressure builds into the Mid-Atlantic region.
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A cool front will clear the coast this morning and usher in a comfortable air mass for the Mid-Atlantic region. Humidity will lower today as a westerly breeze picks up and temperatures late tonight will drop to cooler levels seen around here in quite awhile. It stays pleasant on Saturday with plenty of sunshine expected and turns warmer on Sunday and Monday. Peak temperatures on Saturday afternoon should be in the lower 80’s and then in the low-to-mid 90’s by Monday afternoon just ahead of the next cool front.
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A cool front will approach the region late today and this will increase the chance of isolated showers and thunderstorms from later this afternoon into early Friday. A pleasant air mass will follow the passage of the front for the bulk of the day on Friday and it promises to be quite comfortable tomorrow night and on Saturday. It turns warmer on Sunday with temperatures climbing towards the 90 degree mark by afternoon and the low-to-mid 90’s can be reached on Monday afternoon. The next cool front will likely pass through on Monday night ushering in another comfortable air mass for next Tuesday and Wednesday.
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We have entered the second half of August and this is typically when tropical activity ramps up in the Atlantic Basin. Indeed, there are a couple of impressive waves to watch in the far eastern Atlantic Ocean and there may be a threat to deal with in the eastern US/Gulf of Mexico by the last week of August; however, of more immediate concern is the current activity in the eastern Pacific Ocean. There is a growing chance that significant moisture from a tropical system makes its way into the Southwest US by later this weekend and early next week - and this includes a very real threat for excessive rainfall across southern California. In addition, winds may become quite high depending on the ultimate storm track that this developing tropical system undertakes.
Elsewhere, a building ridge of high pressure in the upper part of the atmosphere will result in an intensifying heat wave by this weekend across the central states and it is likely to expand to the Great Lakes and Midwest. While the heat may ultimately expand all the way into the Mid-Atlantic/Northeast US, this would be just a one or two day affair and the overall weather pattern for the northeastern states remains quite favorable for very comfortable air masses to reach this area from central Canada.
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A cool front crossed through the Mid-Atlantic region on Tuesday night and today should feature mainly rain-free conditions although an afternoon shower cannot be completely ruled out. Another frontal system approaches the region later Thursday and this will increase the chance for showers and thunderstorms from later tomorrow into early Friday. More comfortable air returns for the bulk of the day on Friday and for Saturday as well and then it’ll turn very warm again on Sunday and Monday ahead of the next cool front which likely arrives on Monday night.
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A strong cool front will cross the Mid-Atlantic region late today and it is likely to generate another round of showers and thunderstorms; primarily, focused in the period from mid-afternoon to early evening. Some of the storms late today can be strong-to-severe with the highest chance for severe weather along and to the south and east side of I-95. High pressure will follow the passage of the cool front on Wednesday, but additional frontal systems will keep it somewhat unsettled later in the week.
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