A tsunami could cause damage along coastlines of all islands in the state of Hawaii. The National Weather Service says urgent action should be taken to protect lives and property.
A tsunami is a series of long ocean waves in which each individual wave crest can last five to 15 minutes or more and extensively flood coastal areas.
The danger can continue for many hours after the initial wave as subsequent waves arrive.
The NWS says the tsunami wave heights cannot be predicted and the first wave may not be the largest.
Experts say tsunami waves wrap around islands, so all shores are at risk no matter which direction they face.
The NWS says extremely strong and unusual near-shore currents can accompany a tsunami.
Debris picked up and carried by a tsunami amplifies its destructive power. Simultaneous high tides or high surf can significantly increase the tsunami hazard.
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