| 1. | When the inner eye wall collapses, the eye expands, and winds abate.
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| 2. | Satellite imagery also began showing that an eye wall structure had formed.
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| 3. | Around that was the eye wall, probably 20 to 40 miles wide.
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| 4. | Other parts of the eye wall might contain islands of far weaker winds.
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| 5. | But they don't fully understand a cyclical process " eye wall replacement ."
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| 6. | Rotating around it is the eye wall, with the fastest, most violent winds.
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| 7. | But even a basic explanation of eye walls gets complicated.
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| 8. | It then got the trailing end of the eye wall for about three hours.
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| 9. | An onset of eye wall replacement cycle is evident here.
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| 10. | "There's no question that in the northern eye wall the damage was tremendous ."
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