Shear over the northwestern Caribbean looks to be running 15 to 30 knots in the upper-levels, and practically non-existent to maybe 25 knots in the mid-levels. That level of shear, while relatively "high," is really not all that challenging - 91L is currently basically stationary, and the shear over it is not exactly un-supportive .. and should the upper-level high get better established atop 91L, then that shear would ease up, and it is conceivable that 91L could undergo a bit of rapid improvement.
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Re: "Agatha" Reemerges in Caribbean - June 1st Now Atlantic Invest 91L -