like Jac my threat would be a major winter storm,an ice storm would be even worse as the power lines would be down.
i have a few things like a kerosene heater and camping gear to wait it out.
I don't think most people have the room to store precut plywood over the years between storms and maybe down there it would rot if left outside.
I had a look at Google Earth to see what the area around Miami looked like and I was shocked at the huge developments of smaller one story homes.i can see why the shelters filled up.