Katrina, alternatively, hit Florida as a Class 1 hurricane, then spent three full days gaining energy over the Gulf of Mexico, reaching Class 5, with winds as much as 175 mph. Regardless that it weakened because it churned towards land, the storm had loads of time to generate the huge 19-foot storm surge that it pushed onto the coast. It was that surge that did essentially the most harm, overrunning levees and inundating coastal communities, together with a lot of New Orleans. Greater than 1,800 folks died.
https://www.washingtonpost.com/nation/2021/08/31/how-ida-katrina-compare-wind-fingerprints/?utm_source=rss&utm_medium=referral&utm_campaign=wp_national | How Hurricane Ida was completely different from Katrina: Have a look at the wind ‘fingerprints’