State level statuses (state ranks or S-ranks) are generated by the state Natural Heritage Program, and then reported to NatureServe. Here’s the link to the definitions of global and state ranks from NatureServe, in case you’ve never seen this: https://help.natureserve.org/biotics/content/record_management/Element_Files/Element_Tracking/ETRACK_Definitions_of_Heritage_Conservation_Status_Ranks.htm
This report may also be of interest: https://help.natureserve.org/biotics/content/Methodology/natureserveconservationstatusfactors_apr12.pdf
When I was working for the Massachusetts Natural Heritage and Endangered Species Program, I helped develop the state ranks for various taxa in Massachusetts. I can’t speak to how other states do it, but in Massachusetts, we looked at all the data we had, talked with various experts internally and sometimes externally, looked at the literature, and made our best estimate. However, we did not issue any sort of public report (or even internal report).
It’s also been my experience that sometimes Natural Heritage Programs have not had the time to update state ranks for every taxa in their state, so if a species has expanded into a state in the past decade or even two (for example, Black Vulture and Sandhill Crane as breeding birds in Massachusetts) or has gone downhill suddenly (because of white-nose syndrome in bats, for example), the state rank as reported by NatureServe may be out of date. Many (MANY) Natural Heritage programs are seriously understaffed and just cannot do everything they would like to do. There can also be a delay at NatureServe in collecting updated state ranks, again because of understaffing.
As for the situation in Hawai’i, I can’t help you. My best advice would be to contact the state Natural Heritage Program and ask them.