Originally Posted by HTC
Katrina had close to 600 Km in diameter, IIRC. This one had 1600 Km just before landfall, according to CNN.
Katrina was a cat. 5 hurricane @ sea and was a cat. 3 on landfall near New Orleans, IIRC. This one, was a cat. 2 near Cuba but wasn't even a cat. 1 on landfall and yet it was far far greater in size then Katrina and, to date, Katrina is by far the costliest weather phenomenon to date in US.
They go a lot bigger and stronger. Check out Hurricane Isabel as an example.
Katrina did so much damage because of the dikes being over 100 years old. Andrew had way more punch. Never mind the labor day storm.