Not too many storage facilities that can survive a Cat 5 storm??? Do you have a trailer?? Depending on where Irma decides to go I would pack up all my valuables, birth certificates and important family pics and head North then West!! We just missed the Harvey bullet but we had all our stuff packed in big plastic bags and plastic storage containers ready to get out.
What's even worse is that you can't "run" East or West from where you live, your only option is North!! In a day or two the gas will disappear and the stores shelves will be bare!! Get water now because you can always drink it later if the storm bypasses you. Buy those 1 1/2 gal plastic water jugs and freeze them now to keep food in a cooler if you loose power (I still have some in my freezer from Harvey), when the jugs defrost you can still drink the water (nothing wasted).
Wishing you luck!!
PS- when we left town for the last hurricane (years ago) we had to drive 700 miles just to find an open hotel room. All the folks that left town before us had taken everything including the sketchy/cheap hotels!! Staying at a relatives (or friends) house is a better option preferably in another state. It ain't no fun!!
treblig