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Terra, I am not sure who you were responding to, but my whole point is to NOT obsess over every point. I am not trying to be mean or anything but extrapolating two hour movements, and "eyeballing" movements are not necessarily good ideas when you have a MAJOR hurricane bearning down on an area.
Please understand I mean no disrepect, I am simply trying to give my educated opinion.

The education attempt is appreciated. Let me explain my reasoning, though - I'm looking at the shape and movement of the central dense overcast (CDO) - the whole storm, not just the eye. As the storm changes shape, it shows in some ways how it is being infliuenced by factors that will potentially steer it one way or the other.

Currently with the eye not visible on IR, it's easy to take some dry entrenchments as being the eye which can cause confused, too. It's hard to say which was Katrina will ultimately head, but it's "pointing" toward a more northward motion than the 4pm forecast, though. The 10pm forecast could stay the same, or it could move to the east. We'll find out at 10pm (CT).