was checking out the topographic maps at teraserver.com and the area from Franklin on out to the Gulf is mostly if not all marsh. By now with the strong onshore flow most of that marsh area may well be filling up with water.
I would imagine the coastline is like that of the big bend area or the Sw part of Florida, where its not a real defined line of land ending and water starting

That storm surge wont have to go over much land because what little is there is probably under water already.
Geeze!!! upwards of 15 feet+ strom surge plus wind blowing waves on top of that?!?!?. This is where the love/hate relationship with hurricanes really comes into play.