Rainfall has been rather sporadic in much of the Mid-Atlantic region during the past couple of months with some spots getting drenched by small-scale thunderstorms and other areas staying largely rain-free. The end result of this weather pattern has been the browning of many lawns and the need for some soaking rainfall. The best chance in awhile for some heavy rainfall on a more widespread basis comes to the Mid-Atlantic region in the time period from later tomorrow into the upcoming weekend. The combination of tropical moisture associated with Beryl’s remains and a stalling frontal system along the coast will enhance this chance for heavy rainfall and, hopefully, there will be some improvement to area lawns.
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Hurricane Beryl is now classified as a category 4 storm and will impact Jamaica shortly with hurricane conditions as it continues to push across the Caribbean Sea in a west-northwest direction. On this path, Hurricane Beryl will slide across the Yucatan Peninsula region of Mexico on Friday and then push to a position out over the open warm waters of the southwestern Gulf of Mexico this weekend. The weakening of Beryl which began late yesterday will likely continue for the next couple of days as it bypasses Jamaica and then crosses land mass of the Yucatan Peninsula on Friday. After that, Beryl may very well re-intensify this weekend and it likely shifts to a northwesterly direction which would put southeastern Texas on the table for a possible landfall by Sunday night/early Monday.
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Hurricane Beryl remains classified as a category 5 storm and is moving at a pretty good clip (22 mph) across the Caribbean Sea. Hurricane Beryl will move very close to or right over the island of Jamaica on Wednesday and then likely reach the Yucatan Peninsula region of Mexico by the end of the week. After that, the likely scenario has a weakened Beryl moving over the southwestern Gulf of Mexico and it very well can take a turn to the northwest late in the weekend meaning a landfall in southeastern Texas is on the table.
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Hurricane Beryl is now moving across the southern Windward Islands and into the Caribbean Sea as a category 4 hurricane with maximum sustained winds of 140 mph. This system has a chance to intensify into category 5 status (sustained winds of 157 mph or higher) in the next day or two as it treks to the west-northwest over the warm waters of the Caribbean Sea. On this current track, Hurricane Beryl will move close to the island of Jamaica by mid-week and then likely reach the Yucatan Peninsula region of Mexico by the end of the week. After that, the likely scenario has a weakened Beryl moving west towards eastern Mexico; however, a turn towards the northwest and southeastern Texas cannot be ruled out later this weekend.
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There are currently two tropical systems in the Atlantic Basin with one located over the western Caribbean Sea and the other positioned in the eastern tropical Atlantic. While the frontrunner tropical system may indeed generate lots of rainfall for the Yucatan Peninsula and then eastern Mexico, it is the trailing system that may ultimately become more of a concern. The tropical system still well out in the Atlantic has a good chance for intensification in coming days and it very well could become quite an important player on the tropical scene in about 7-10 days or so.
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Several ingredients will come together late today and tonight to raise the chance of severe thunderstorm activity in the Mid-Atlantic region. The combination of an approaching surface cool front, higher heat and humidity, a strong low-level jet, wind shear, and an upper-level trough will result in showers and thunderstorms from later today into tonight and any thunderstorm can reach severe levels. The severe weather threats include damaging wind gusts, heavy rainfall, and large hail. In addition, given the expected formation of strong wind shear, there will also be the potential of isolated tornadoes.
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While quite warm this week in places like Washington, D.C. and Philadelphia, the worst of the heat and humidity is still to come. In fact, humidity levels have been rather manageable in these areas during the past few days limiting “heat indices” which are meant to reflect how weather conditions “feel” to humans given the heat and humidity. Large-scale upper-level ridging has been centered overhead during the past few days allowing for a bit of an onshore flow of air in places like D.C., Philly, and southern New Jersey, but that pattern will change in the Friday, Saturday, Sunday time frame resulting in higher heat and humidity. In addition, the chance of showers and storms will increase beginning later tomorrow and the threat of rain will continue this weekend and any storm that forms can produce locally heavy rainfall and damaging wind gusts.
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Washington, D.C. reached the 90 degree mark on Thursday for only the first time this month, but that is about to change in a big way as an extended hot spell is coming to the Mid-Atlantic region. The hot stretch begins early next week, but before we get there we’ll have to deal with possible strong-to-severe thunderstorms later today and early tonight and these will be followed by a comfortable Father’s Day weekend with lower humidity.
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Numerous signs point to an active tropical season this year in the Atlantic Basin with more tropical storms, hurricanes, and “major” hurricanes compared to the long-term averages. The average number of named tropical storms in an Atlantic Basin tropical season is 14.4 with 7.2 of those reaching (minimal) hurricane status, and 3.2 becoming “major” (1991-2020 baseline period).
Based on my overall analysis of current and forecasted atmospheric and oceanic conditions, I expect around 16 named storms this season with around 9 reaching hurricane status and of those perhaps as many as 4 to achieve “major” classification level. Another metric to use in the assessment of overall tropical activity is known as the accumulated cyclone energy or ACE which utilizes both strength and longevity of tropical storms in its calculation and I expect this to be 150-160% of normal in the Atlantic Basin this tropical season.
The two most important parameters that have been factored into the “2024 Tropical Outlook” include: (1) the development of La Nina in the equatorial part of the Pacific Ocean and (2) warmer-than-normal sea surface temperatures in much of the breeding grounds region of the tropical Atlantic Ocean and Caribbean Sea…both of which are favorable for the development and intensification of tropical activity. I believe the most vulnerable areas to be directly impacted this upcoming tropical season include those in and around the Caribbean Sea, Gulf of Mexico, and Southeast US.
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A spurt of tornadoes since late April has put levels well above normal as we reach the end of May and the overall active weather pattern of recent weeks looks like it’ll continue into the month of June. One of the key ingredients to this on-going active weather pattern has been the steady influx of colder-than-normal air masses from Canada into the US at the same time increasingly warm and humid air has been flowing northward from the Gulf of Mexico. The main area of concern for severe weather and tornadoes over the next few days will be across the Plains states all the way from Texas (today/tonight/tomorrow) to the Dakotas/Minnesota (on Sunday).
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