Kauai had an early '50's episode of stalled-tropical-storm rain that exceeded 52", a total even more than Houston recently suffered. Flood control projects followed. But Oahu is extremely vulnerable to events like that, and highly susceptible to wind damage if a Cat IV hits in full strength.  And now we have to contend with Nork nukes. As for tsunami, our government minders have still not mounted signs showing where the high water demarcation will be when citizens flee imminent ocean inundation.