So, here's the thing.
They're way out in the North Pacific. That "cradle of storms" thing is real.
Those big waves that surfers love on the North Shore of Hawai'i?
This is where they come from! Storms in the North Pacific! They're still huge after they make it to HAWAI'I
That's how all that kelp gets onto shore. Big storms, big waves, tearin' up the kelp forests & dropping them on the beach.
So you'll still get occasional 20, 30' waves even after a local storm is over.
When it's otherwise calm & the cows are out grazing on the beach.