The predicted wave on the west coast is 50cm, so I don't think it's going to be noticeable.
Ships in deep water aren't generally affected by tsunamis as they have very long periods, low amplitudes, and travel very fast in open water. It's only once they hit shallow water, slow down, and build that they become a threat. If the tsunami warning was more serious, they could take the ships into deep water and wait it out.