 Aloha, I'm Pat Durkin with your KKCR beach and safety tip for today. Rip currents are the leading cause of ocean rescues by lifeguards. Knowing how to recognize rip currents could keep you out of trouble. Surfers, fishermen, and experienced beachgoers respect the old adage, white water in, green water out. That means, as you stand on the beach looking out to sea, if you see white water from breaking waves, that water's coming in.