Tsunami warnings are being downgraded in most areas following one of this century’s most powerful earthquakes in Russia.

After an 8.8-magnitude earthquake struck the Far East region of Russia on July 29, Hawaii and the U.S. West Coast were hit with tsunami warnings and advisories.

By The Associated Press A tsunami sent waves into Russia, Japan, Hawaii and the West Coast of the United States after an 8.8-magnitude earthquake struck off the coast of the Russian Far East early … ...

Tsunami waves can also continue to impact coastlines hours after they first hit. As forecasts evolve, what's the difference between a tsunami warning, an advisory and a watch?