In reference to the last time a 100mph hurricane without a visible eye. Going by Dvorak guidance, the storm should be at least a T5.0 per the intensity chart, however an eye becomes visible at T4.5; SSD is indicating the storm was T4.5 last update while CMISS ADT was showing a T4.2 based on computer analysis of the CDO.

This storm is very unusual. I think essentially it is strengthening too rapidly for the eye to have cleared out yet, but it is actually a higher T number.

CMISS ADT ref: http://tropic.ssec.wisc.edu/real-time/adt/odt09L.html