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It was a Cat 5 in all but name. Max winds were measured at 155 MPH, Cat 5 starts at 157 MPH wind speed.

So a cat 4 is a cat 5 in all but name? And a cat 5 is a cat 6 in all but name?

Don't be obtuse. This was 2 MPH away from being a "weak" Cat 5.

Or we can say that this was a strong cat 4 instead.