To warn its residents of the tsunami, officials in Hawaii dispatched low-tech warning systems. When the tsunami warning was issued for the Pacific around 9:30 p.m. local time in Hawaii, sirens blared across the islands and trucks with loud speakers drove through neighborhoods.
Mindy Pennybacker, a Huffington Post blogger, reported:
A truck is circling our neighborhood, with a man giving an emergency management message over a loudspeaker: ‘Extremely dangerous waves are expected at 3 am. Occupants of high-rise buildings are advised to go to the third floor or above without delay.’