About a year ago on the Weather Channel, they were doing a report on Sierra snowpack. The snow was roughly 400-500 inches, but whoever put together the graphic (apparently inadvertently) used the ' for feet rather than " for inches.
So the bimbos are reading along, one says the snow is "500 feet deep"; the other asks, incredulously, "500 feet - don't you mean 500 inches?"; the first then responds "Nope ... it says right there - 500 feet", and the second then acquiesces "Well, I guess you're right".
30 ft. waves? You're talking a major tsunami...that would wipe out everything deep onto land.
fyi....any sailor can verify that thirty foot waves off Hattaras or Montauk or Cape Cod are real and not at all unusual in TS conditions.