Anybody that survived the two blast waves throwing tons of materials like dust, one supersonic blast wave coming from the direction of point of detonation, the second caused by the vacuum going back towards the point of detonation will have to attempt to survive the Firestorms of anything combustible like wood asphalt shingles bursting into flames due to high overpressures, the Firestorms create their own wind patterns to spread rapidly.  Anybody believing they are safe in an underground shelter are wrong, the Firestorms will suck all the oxygen out.  The High Overpressures will burst ear drum and rupture eyes, if not completely crushing people.  The rolling supersonic blast wave will level the City of Honolulu all the way to Kaimuki, Kaimuki will deflect the blast wave, Kahala Mall eastward might survive.  Then comes the Alpha and Beta fine as talcum powder fallout, walking thru that kicks up a cloud for you to breath, clogs air filters.   Water, no electric water pumps.