Red flag: Strong currents and/or waves. No swimming in sea.
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If sharks are present, red flags will be hoisted or a shark sighted sign will be posted. If you see a flag or sign at the beach and you're not sure of its meaning, ask a lifeguard for an explanation or look for an indicator key nearby.
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.
These flags will fly from lifeguard stands to alert of any potential dangers. As indicated, a double red flag means the water is closed to the public; no swimming is allowed.A single red flag indicates hazardous conditions, such as strong waves or currents.
Red flag is high hazard meaning high surf and/or strong currents. Yellow flag is medium hazard meaning moderate surf and/or currents. Green flag is low hazard meaning calm conditions, exercise caution. Purple flag means dangerous marine life spotted.