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A GREEN flag means that the water is calm. The undertow is slight to non-existent and it is safe to swim using the proper amount of caution!
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A YELLOW flag indicates the presence of light surf or currents and additional caution should be used while swimming in the Gulf.
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A RED flag indicates the presence of strong surf and currents. Swimming in these conditions is not recommended as it presents a very high hazard to all swimmers.
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A DOUBLE RED flag, however, means that the water is closed to the public! No one is allowed in the water when a double red flag is posted!
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Finally, a PURPLE flag indicates the presence of marine pest in the water such as jellyfish, stingrays or dangerous fish.