One good thing that might result from this dubious "axedent".... is that attention is drawn to the warning system AND shelter situation around the nation, not just in Hawaii. Might also be a good time to invest in a fallout shelter construction business (history repeats)...lol.
Ahem, I am a Mason contractor with hidyhole experience.... tornado country. Been thinkin' 'Bout making them more than just a short term bunker.
As for Hawaii...likely you would not need any long term(months shelter). It would be an air-burst miles above ground. People in the lee of any mountains/volcanoes would be fine, fallout on the Isles would be minimal.... most would be downwind over the ocean.
Underground is a good place to be, shielding from the Gamma burst is the greatest priority.... well outside of the shockwave. Water is a good radiation shield..... maybe some scuba would be a good thing to have on hand. I'd shoot for some shade at 30+ feet.
Question is...why would a sane nation capable of eliminating that problem(NK) ...not go ahead and eliminate said problem.
Probably waiting until after SK winter games.
Note to self, sell NTDOY before then, buy CHK.