What does ’30 foot seas’ indicate when used in the description of ocean conditions?

Question

I think my biggest hang up is I haven’t really been able to rationalize the difference between what a wave is versus a swell.

In: Other

Answer 1

Here is good explanation of wave vs swell:

[https://www.hko.gov.hk/en/wservice/tsheet/pms/files/Wave_observations-final.pdf](https://www.hko.gov.hk/en/wservice/tsheet/pms/files/Wave_observations-final.pdf)