The images they were just showing on Fox, I believe they are false color images of clouds rather than radar, show a substantial air movement south from western Louisiana to the west which could influence Katrina to curve more to the north. and the eye seems to be doing so and might cause her to shift course to the east earlier. The warming of the surface waters began on the coast itself which means she is going to continue to move into warmer waters rather than into cooler waters.

If the wind speed continues to increase, even the drop caused by hitting land might not be enough to drop her into a category 4 immediately.