So the GEM and GFS are on board with development. The NW Caribbean should continue to increase in convection over the next 24-48 hours as a trough of low pressure begins to form there. The entire area looks to be moistening as a tropical wave heads towards that area of the Caribbean and a trough moves into the Western Gulf of Mexico towards the NW Caribbean.
Saved water vapor loop:

Also the 12Z FIM-9 model (based on NCEP data, same as GFS), has a pretty decent system cranking up and moving north paralleling the eastern seaboard of the United States, 168 hour position below:
