If you ever see square waves in the ocean, the most important thing is don’t go swimming. They can look fascinating, but the pattern can indicate two different wave systems crossing each other, creating a dangerous sea state.
Square waves, sometimes called a cross sea, happen when waves traveling in different directions intersect. Instead of producing the usual rows of waves moving roughly parallel to the shore, you can see a distinctive grid-like or checkerboard pattern on the water.
They’re especially noticeable from above, where the intersecting wave patterns become much easier to see.
The problem isn’t that the waves are literally forming perfect squares. It’s the crossing currents and wave systems that matter.
When waves from different directions meet, the water can become much more chaotic. Wave heights can vary rapidly, and conditions can be difficult for swimmers, surfers, and even boats.
A person swimming in calm-looking water might suddenly encounter stronger movement or be pushed in an unexpected direction.
This is the biggest rule.
If you’re at a beach and notice a pronounced cross-sea pattern, don’t enter the ocean simply because the water looks beautiful or unusual.
If you’re already swimming, head toward shore calmly if you can do so safely.
Look for beach safety signs, flags, lifeguard instructions, and local weather or marine warnings.
A strange-looking sea isn’t something to challenge just for the experience.
One of the deceptive things about cross seas is that the surface can look mesmerizing rather than obviously stormy.
Ocean conditions can change quickly, particularly when different swell systems are interacting.
If you’re visiting the beach with children, keep them well away from the surf when conditions appear unusual. Children can be particularly vulnerable to unexpected waves and currents.
If you encounter a cross sea while boating, follow the vessel’s safety procedures and the advice of local maritime authorities. Don’t deliberately steer into increasingly rough conditions simply to get a closer look.
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