This prophecy predicts a series of tsunamis never seen before hitting cities and shorelines on the East Coast. Some will cause massive amounts of damage on a biblical scale. Others will cause minimal damage, and will be more akin to signs denoting great changes in America. Also, some of these prophecies may not have a literal fulfillment in the form of an actual tsunami. While many of those who have seen this, either in dreams or visions, declare that it will be literal, it could possibly also be symbolic. Some of my reasons for saying this is because of all the talk recently about a "Red Wave", "Red Tsunami" and others.
Therefore, a "tsunami", in symbolic terms, refers to a sudden and dramatic change of substantial size. If it's meaning truly is symbolic, it may signal or symbolize a sudden spiritual, economical, political or other shifting in this nation occurring along the coastlines, or within the states themselves that border the Atlantic ocean. It may also symbolize tsunami like changes in the nation as a whole, starting on the East Coast. Now I'm not saying that's what this is, as we don't know for certain yet. All I'm saying is, those are the possible interpretation of the many prophecy sources listed here in this entry. If I see things become more defined and certain at a later time, I'll update things as I always do.
EDIT (2022-02-15): Since we're now getting prophecies about tsunamis that are NOT the big one, I've decided to include them here as well.
(*Do you have a better description, or did you find an error? Please let me know.