10PM EDT Update 20 November 2023
The marginally favorable W Atlantic continues late into the official season, buoyed by record warm waters in the Atlantic and not yet toned down in any normal sense of the word by a developing strong El Niño in the eastern Pacific.
Tonight we begin tracking two more areas of interest. First and closest to land, newly Invest-tagged 99L in the central Caribbean is a small, but fairly well-defined area of low pressure. Second, southeast of Bermuda an area of low pressure is developing along a front and is expected to begin acquiring at least some subtropical or tropical characteristics as it travels southeast across the subtropical Atlantic.
6:30PM EDT Update 17 November 2023
High shear has begun taking over the Western Atlantic once more, and while we did see a near hurricane-force hybrid low over S Florida, the system with the better chance of becoming an actual named, tropical storm, Invest 98L, is being held in check by increasingly prohibitive levels of southwesterly shear and dry air.
While development of Potential Tropical Cyclone 22 into a subtropical or tropical storm is becoming unlikely, heavy rains, some gale-force winds and flood threats across Jamaica, southeastern Cuba, and Hispaniola will continue, with totals as high as 16" in spots likely to produce life-threatening flash flooding and mudslides.
11:50PM EDT Update 15 November 2023
The non-tropical Gulf of Mexico low pressure area we have been tracking has, as forecast, spun-out a rather stout hybrid low pressure area presently situated over the south Florida Keys. Sustained winds have been well into tropical storm force, with stronger gusts. This area of low pressure is not yet Invest-tagged, but presents a concern especially for those along the coasts, in the Keys and on and offshore from south and east Florida.
Flooding is becoming a top concern in South Florida as amounts may approach double digits, and power outages from the wind are accruing.
We now have a Forecast Lounge up on this feature, as well as on that of Invest 98L in the Caribbean.
Original Update
Two developing features in the Western Atlantic have the potential to become named cyclones this week. First, an area of broad low pressure is starting to take shape in the southwestern Caribbean, which is a favored area for tropical cyclone genesis this time of the year. Second, the non-tropical coastal low in the northern GOM may split off, with a hybrid to tropical low possible off the east coast of Florida by Thursday or Friday.
At present, is not yet mentioning the northern GOM low, but does have a 70% (High) probability for the model-forecast Caribbean low to develop.
There is a chance that one or both of these could become a strong storm or even a low-end hurricane while close to land in the Western Atlantic, although the odds of any truly serious development appear to be higher once both are more out to sea.
We do already have a Forecast Lounge up on the model-progged Caribbean cyclone
22L Forecast Lounge
S Florida/Keys Coastal Low Lounge
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