It is basically saying that the high pressure over Florida is going to point the hurricane in the direction of the Northern Gulf Coast, and that little has changed in the atmosphere to keep it from going in the forecasted direction. But, do not rule out any directional changes until the eye re-emerges from Cuba and has had time to intensify if it is going to. The changes have very little to do with how much rain florida is going to get. The eye of the hurricane is what is tracked and is influenced or not influenced by differing changes in the atmosphere to its north. The higher pressures will influence speed and forward movement of the eye. All of it is subject to greater or lesser pressures.