not sure if you may be able to view this.... here's a look out of a one of the P-3's...(NOAA aircraft) at katrina's eye.... pretty picture... would est. plane is flying at or near 10,000ft. or lower... i think this may also be when the eye was 32nm wide....not sure what day or time.... but i would bet she is atleast a cat 4 in the picture.... the stadium effect is perfect and no high clouds are seen over the eye in the picture.....

http://www.aoml.noaa.gov/hrd/Storm_pages/katrina2005/Reye9.jpg

if you can't see the picture.....more information can be found here

http://www.aoml.noaa.gov/hrd/data2.html