Storm surge is different because of so many factors. I remember we didn't see the dreaded storm surge with Hurricane Charley, even though it hit Charlotte Harbor, FL as a 150 mph Category 4 hurricane, because it was so tiny, fast moving and was only a Category 4 for about two hours prior to landfall. Hurricane Ian was the same intensity and the exact same landfall location, but was much, much larger in size, slower moving, and had hours and hours as a Category 4 and 5 to build the disastrous storm surge.