At first glance, the ocean can sometimes look almost unreal.
In rare conditions, waves traveling in different directions can create a striking grid-like pattern across the surface of the water. Known as square waves or cross seas, this phenomenon can produce what looks like a checkerboard stretching across the ocean.
Although the pattern is fascinating to watch, it can also be a warning sign of complicated and potentially dangerous sea conditions.
How Do Square Waves Form?
Square waves occur when two different wave systems meet at an angle. One set of waves may be generated by local winds, while another may come from a distant storm or weather system.
When these swells travel in different directions and intersect, they can create the distinctive crosshatch pattern visible from above or from the shoreline.
The surface may look organized and almost peaceful, but beneath it, the water can be moving in several directions simultaneously.
This can create unpredictable currents, changing wave heights, and unstable conditions that are difficult to anticipate.
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