I'd highly recommend against staying on the boat if at all possible. Go to a shelter if there is one available.
Don't rely on "bungees" alone, tie down with stout line (not small stuff). Better yet put it below and secure it. If your are tied up so that the lines cross at your bow or you are on a mooring and you have an anchor, remove it. It can be like a knife and cut the lines in a heartbeat.
The problem with a slip or even a mooring is that you are also subject to how well others have prepared. Are there any boats there that are leaving their canvas up? Has everyone doubled up their lines? All it takes is one boat to not prepare and start a domino effect, especially if the winds keep it up for many hours. Make sure you have chaff protection wherever there is a possibility of rubbing (including line on line where "sawing" can occur) but don't completely "seal off" the lines with something like tight water hose or flexible pvc. Lines can get hot from stress on them and from pumping and the water helps cool them off. If you cut off all the water there is no cooling.
I'm not saying don't stay in Port Saint Joe, just that its not worth your life to stay on the boat. You are subject to the preparation of not only your own boat but to the preparation of those around you. In my experience there are always a few absentee owners and sadly, a few that are happy to collect the insurance check for their totaled boat.