Sand goes and comes annually, but big storms pull some too far away to return. Waves swept away half the sand on North Beach in San Clemente, where just a few months ago sunbathers basked. A rock that a beachgoer could stub a toe on in south Laguna during the summer months is now exposed as a 10-foot-tall boulder.Recent storms have changed the coastline dramatically, shortening the beaches in height and width. It's a process that happens to varying degrees each year, with sand pulled out into the ocean in the winter and pushed back up on shore in the...