A green flag on the beach is an all-clear sign, indicating that it's safe to swim: Sea is quiet, without danger or risk. Good quality of water and general beach conditions. No risk situations for the swimmers.
People Also Ask
Purple FlagsWhen potentially dangerous ocean animals have been spotted, you'll see a purple flag. These flags fly either on their own or with other colored flags. If you see a purple flag, but the water is not closed to swimming, use extreme caution and keep a close watch for dangerous animals.
A rip tide is a specific type of current associated with the swift movement of tidal water through inlets and the mouths of estuaries, embayments, and harbors.