The tsunami slammed the eastern coast of Japan, sweeping away boats, cars, homes and people as widespread fires burned out of control. It’s traveling at 500 mph – as fast as a jetliner – and likely won’t change speed until it hits a large area of land.

Waves are predicted to hit the western coast of the United States between 11 a.m. and 11:30 a.m. EST Friday. People near the beach and in low-lying coastal areas of Point Conception in Santa Barbara County were told to move immediately inland to higher ground.

While the tsunami is likely to go around smaller islands, the size of Hawaii’s islands will amplify the waves, which will crash hardest against harbors and inlets.