Depending on actual track, I believe worst case for Jacsonville would be cat 1 winds (74-95mph). Highest winds along the coast.
Of course, now that school is cancelled in Jacksonville, that's bound to help keep Jeanne away, right?
Speaking of different tracks, do you remember when Jeanne was approaching the first time and Accu(not)-Wx was predicting Jeanne to go into the GOM? Now it looks like they might have to revert back to that original forecast again.

I'll be surprised if the center of Jeanne tracks north over Florida from where its at now rather than moving up the east coast or moving across to the west coast, as some models now seem to be suggesting.