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Multiple eyewalls had been detected in very strong hurricanes before, including Typhoon Sarah and Hurricane Donna, although the double eyes were usually seen in very intense systems.
Double eyewalls were also seen post-seeding in some of the seeded storms.
At the time however, the only known times that rapid changes in eyewall diameter, other than during presumably successful seedings, was during rapid changes in intensity.
It remained controversial whether the seedings caused the secondary eyewalls or whether it was just a natural cycle.
Basically, if eyewall changes similar to those observed in seeded hurricanes were rare in unseeded tropical cyclones, it would provide powerful evidence that Project Stormfury was successful.
Conversely, if such changes were common in unseeded systems, it would throw doubt on the very hypothesis and assumptions driving Project Stormfury.

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