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Implicitly what it’s saying is: “Hurricane reaching a maximum category of X”

That was my assumption, too, but the website shows 110 days since the last cat 5 but 114 days since the last cat 2, and they're not the same event.

More than that: the last cat 5 is "Otis" while the last cat 2 is "Tammy". AFAIK they are named in alphabetical order?

Something seems fishy in this dataset.

I mean, you can ask the meteorologists about the process of naming, but those hurricanes actually existed, on the dates suggested, so I'm not sure what's "fishy" about it.

Hurricane Tammy, Cat 2, October 18, 2023: https://en.wikipedia.org/wiki/Hurricane_Tammy

Hurricane Otis, Cat 5, October 22, 2023: https://en.wikipedia.org/wiki/Hurricane_Otis

I believe that the naming relates to which ocean they're forming in, but it's probably good for you to do your own research, so you can clear up any "fishiness" yourself.

I think the poster is suggesting that the Cat 5 should also count as a Cat 2 as Cat 5 is stronger than Cat 2.

There are several region dependent different name lists, just have a look at https://en.m.wikipedia.org/wiki/Tropical_cyclone_naming

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