One sunny morning, I noticed The Stripe again:

Running all the way up and down the coast.

In places where there is a large fetch the stripe is clearly foamy:

But looking downwind from the pier the picture above was taken from, the foam stripe becomes just a stripe!

And looking in the same direction, but from further out on the pier, we see that there is in fact a lot of foam on the water, somewhat organised in rows.

Later the same day the wind had picked up and it became even clearer:

See?