GFS has been in again off again developing a tropical system and moving it into the gulf. The 18z run chose violence with its solution, but that's not surprising this far out. The more reliable 00z run comes out around midnight. One thing to keep in mind is that we are almost to the peak of hurricane season (sept. 10) so things are about as conducive as they can be for tropical development. Due to that the long range models are constantly trying to develop tropical systems. They'll put them in a couple runs and then take them out. That said, the GFS has really been wanting to develop a low over the southern Caribbean and move it up into the Gulf. Once we get inside 240 hours it will be interesting to see what the Euro and Canadian models show. If they pick up on the same thing then it might be time to really start paying attention.