Isn't the thing with Tampa Bay that the shore area inside the bay is pretty low and the Bay doesn't drain quickly when water builds up? Also, under some circumstances, a passing storm can suck water out of the bay as it forms the wall of water that is a surge.
One of the weird things about the area (and Florida) is that the highest land points are the gypsum waste stacks at the phosphate fertilizer / acid plants. They are covered with soil, but the gypsum is radioactive.