Like a lot of people, I suspect, I have several works of James Joyce on my bookshelf and one day I'm definitely going to read one of them past the first page.
I've never heard this poem before and the first thing that strikes me is the contrast between black-and-white and full-colour. The winds are monotone and grey. But the sound of waves is white noise - i.e. full colour.
But that's probably too physicsy an interpretation. And even if it was the intention of the author, I can't see why.