Joe B. said that he thinks it's moving more like 10mph right now, not 6mph. He basically said that it's moved 40 miles in 4 hours. The math's correct. He also said that he thinks it will exit the coast tomorrow morning around 6am, then try to figure out where it's going to go. His projected path is pretty close to that of the NHC's. Although, depending on how this storm behaves, that's like trying to find a needle in a haystack.
One more thing he mentioned: he said the storm is being fed by the feeder bands that are just north of the Keys, and that's where Katrina wants to go. I think Margie mentioned this already, but I'll just throw it in there for more confusion.