WWL radio - which was the only station broadcasting all thru the storm (that's what we listened to as we stayed for the storm) has offered links to the broadcasts before and during the storm at this link
Scroll down the page till you get to "Katrina Audio Archives" on the right hand side and click on any one of the
Also, check right above the Radio Archives section to "Katrina Movie Extra 1". This is a movie showing those horrendous hurricane winds outside the radio station's building, across from the Superdome. It's riveting.