The EPAC and Atlantic "areas of interest" are associated with the same surface trough. Therefore, as the EPAC surface low drifts east, it will influence and likely support cyclogenesis in the southern Caribbean region in combination with the low level vorticity. Everything is going to plan and matches my thoughts; convection is currently diminishing over the southern Caribbean as forecast in my graphic. Tomorrow, that will likely change; see my graphic above (black text on white background) for further discussion.
Graphical analysisRed text over mainland Mexico: "Diurnal convection"
Red text near Hispaniola: "Orographically induced convection"
Dark blue text over central Caribbean Sea: "Upper level shear"
Edit: Here's one with clearer text (
http://img296.imageshack.us/img296/4038/caribbeanmay26082mh9.png).