When it comes to colors like green and red, you can probably take a guess at what those colors may indicate about ocean safety at the beach. But have you ever noticed a purple flag on the beach?

A yellow flag, and a special purple flag, have been raised on a beach in Tenerife after a dangerous discovery was made.

Red flag: strong winds and currents Purple flag: Marine life warning ... even on low-risk days. Beach cameras also are available online so Spring Breakers can check out water conditions before ...