Before heading out for your ocean swim, make sure you check for posted warning signs about potential hazards in the area. It's a good idea to check with a lifeguard if you aren't exactly sure of the sign's meaning.
Sometimes waves are so large that high surf warning signs are posted. Though huge waves, like those of North Shore, Oahu, are challenged by expert surfers, the safest thing to do is stay out of the water.
This sign advises that the waves are breaking right on the shoreline rather than further out. If a larger wave catches you, it can push you into the sand and possibly cause spinal and neck injuries.
Sometimes there is no gentle sloping shoreline that lets you gradually enter the water. This sign is to let you know that deep water can be just a step or two away.
Ocean currents sometimes carry jellyfish close to the shoreline. Their stings are painful, and some people may have an allergic reaction to the sting that can lead to breathing and possible cardiac problems.
Shark sightings and attacks on humans are rare. Signs will be posted if sharks have been spotted in the area. It is best to stay out of the water until they move on.
Sometimes it becomes necessary to post signs advising against swimming or having any contact with the water because of high bacteria levels. These signs can just prohibit entry into the water or, in severe bacterial outbreaks, advise that the beach is closed entirely.
