I just awoke and heard the news. As far as Hawai'i, the state has a very good early warning system. In fact, the Pacific Tsunami Center is located on O'ahu. The sirens went off as soon as they determined the possibility existed and all media (radio/TV) would then be on the civil defense system, w/ updates etc.
I know my dad's houses should be fine; they are not in the inundation zone. I'm gonna call later today to see how he/they are fairing. Waikiki should be a ghost town w/ the beaches empty and the tourist shuttled up to higher floors.