While it's true that 6 hour averages give overall, long-term motion, the bad thing is that if a turn begins shortly before the new advisory comes out, the average motion can be deceiving. For instance, the motion for the first 5 hours may be due west, but if in the last hour a turn begins, it won't necessarily be reflected accurately in the average. Charley taught us that lesson down here. I seem to remember that when he made landfall, the motion for the last official advisory was obviously wrong.
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Re: 4 frames now