Wow, middle of the night and 91L is looking like it's tightening up a tad. Tops getting colder and hints of convective banding beginning. That, and taking a hard look at the 0Z GFS upper air data, and am really starting to worry about the potential of a major hurricane in the central Caribbean in just a few days. GFDL is finally on board as well, showing a distinct system trekking somewhat towards Jamaica ( or just east of there ). Regardless of exact forecast points at this time, an already large system further supported by a significant anticyclone overhead could create a devastating flooding risk for Jamaica, E. Cuba, Haiti, Dominican Republic and possibly P.R.