If the 00Z globals are to be believed, the southwestern Caribbean may not even be the true focus for an incipient disturbance. What the guidance is starting to key in on out toward 72-96 hours is a weak
BI or BE system forming between 20-25N and 75-80W (denoted by the dashed blue line) downstream of a 500MB low or trough (annotated) near south Florida,
and in an area of fairly strong upper level westerlies. There's still some sort of lowering of pressures that occurs farther south over the western or southwestern Caribbean Sea (blue circle), but it's really starting to look like more of a disorganized mess with two competing areas of (1) non-tropical, and (2) tropical low pressure developing (1) A little east to southeast; and (2) Well to the south of southern Florida early next week.
GFS

ECM

The less reliable globals are more progressive/open at 500MB, but have a similar surface repsonse.
GEM

NAVGEM

JMA
