Poem-a-day April 2

Today's prompt is to write about water:

Waves thunder across the sea
bringing relentless news from the depths.
Full of themselves, they shout, roar,
must be reckoned with,
then end their gigantic voyage
in ethereal white foam, disappear.
Where do they begin? and how and why?
Such an urgency, thundering on
night and day trying to convince
the shore of something.