Katrina wasn't the last hurricane of Category 3 strength to hit the US in 2005. Rita made land fall in 2005 as a Category 3 in the US. This storm was at one point feared to hit New Orleans about a month after Katrina. Luckily it made landfall in western Louisiana, sparing New Orleans the worst. But that's not all! Wilma hit Florida as a Category 3 in October.
The one thing that was unique about Katrina, Rita and Wilma was that they were all Category 5s while in the ocean before weakening before hitting the US. The strength of these hurricanes is judged by their wind speed not by their rain fall. Katrina judged by rain fall exceeded that of some Category 5s when they made landfall.
Irma does look like it is on a path to squeeze into the gulf. While they haven't made a forcast for what it would do in the gulf, in all probability it would bring in more rain to Texas. The exceptions that would spare Texas some rain would be for a dramatic u-turn after entering the gulf and hit the western side of Florida.
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