I was just about to note that, too. The hint of a circulation that I mentioned earlier, is still there... and it's looking very impressive right now, overall. Rapid movement could slow its development, but that didn't hamper Bertha's development at all. Generally when the NHC says something like "A tropical depression could form at any time", they're looking for something very specific that they haven't seen yet. If the current apparently organization continues overnight, I believe advisories may be initiated as early as 5am, when visible imagery should be available.

The long-term model tracks for this system are extremely disconcerting. GFS and GFDL imply an eastern seaboard threat, while LBAR and BAMM indicate a South American impact. BAMD, which is the most up-to-date model on WU, splits the difference, taking the system straight through the central Caribbean, on a path toward Jamaica.