Wow..that was a great loop to look at. Looks like the High by eastern Florida is starting to weaken, lifting more up to the north, and the trough is really coming in strong. From what I have seen with my un-college-educated eye is that maybe that western motion is slowing and the lifting of the high is going to allow Ivan to start moving more NW.
It also appears that Ivan is now too far west to allow for that trough to push him under Florida.
This is going to be interesting, huh?
Is that what your're seeing?
Note: maybe this is why the NHC has kept the forecast track a little further east of the model guidance for the last couple of advisories?