the onshore wind was a river with no beginning , flowing inland from the west from over the endless blue pacific ocean , bumping the base of the san juan capistrano foothills before pushing as a clogged mass of invisible unbridled energy , boiling itself upward to lift in a rush over the santa ana mountains , to then turn into a deep cooling calm air eddy beyond the last upward thrust of the santiago peak , finally circulating over the bright citrus orchards of the corona valley .