Just to clarify Jason's explanation a little bit more with a few additions -

The trof passing to Fay's north is what will probably turn her NNE-NE across the state and perhaps drop her offshore - maybe allowing her to sit and stall out east of Jacksonville, as one of the more preferred scenarios - Under this passing trof, a ridge of high pressure builds in -- maybe to stall Fay out even more, at least initially, and then, perhaps, shove her inland into Georgia or back across Florida and out into the northeastern Gulf of Mexico.