What to Do If You Spot Square Waves

If you’re at the beach and notice this checkerboard pattern, here’s a simple, step-by-step guide to staying safe:

1. Admire from a Safe Distance

Yes, it’s gorgeous—and you absolutely can enjoy the view! But do so from the shore. This is a sight best appreciated with your feet firmly on the sand.

2. Do NOT Enter the Water

This is the most important rule. No matter how tempting it looks, do not wade, swim, or paddle into a cross sea. The currents are too unpredictable, and the risk of being swept away is real.

3. Warn Others Nearby

If you see other beachgoers—especially families with children—calmly let them know about the potential danger. A gentle word of caution can make all the difference.

4. Alert Lifeguards (If Available)

If the beach has lifeguards, let them know what you’ve observed. They may already be aware, but it’s always good to ensure they’re monitoring the situation closely.

5. Keep an Eye on Children and Pets

Our little ones and four-legged friends are especially vulnerable to sudden currents. Make sure they stay safely on the sand and away from the water’s edge.

How Long Do Square Waves Last?

Cross seas are typically temporary. They form when wind patterns shift, often during changing weather systems or along coastlines with complex underwater topography. Depending on conditions, they can last anywhere from a few hours to a couple of days.

If you see them, it’s wise to avoid swimming for the rest of the day—even if the pattern starts to fade. Residual currents can linger, and it’s better to be cautious.

Is There Any “Safe” Square Wave?

Some people wonder if calm, mild cross seas might be safe. The honest answer is: it’s never worth the risk.

Even when the checkerboard appears gentle from a distance, the underwater currents can still be deceptively strong. The ocean is unpredictable, and cross seas are a clear signal that something unusual is happening beneath the surface.

Safety always comes first.

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