I'm assuming you're talking about the cycloid-like motion of the inner eye inside what appears to be a slighltly larger outer eye-wall. I'm not a weather nerd, but I did find it neat.
Originally Posted by cyswxman
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind." - William Thompson, 1st Baron Lord Kelvin
"If it was so, it might be, and if it were so, it would be, but as it isn't, it ain't. That's logic!" - Tweedledee
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