No.
A cross sea describes waves traveling in different directions and intersecting.
A rip current is a narrow, powerful flow of water moving away from shore.
However, both can create dangerous conditions for swimmers, so seeing unusual wave patterns is a good reason to be cautious.
Why Do They Happen?
Cross seas can occur when a new wind-generated wave system travels into an existing swell moving from another direction.
This can happen when:
- Winds change direction.
- Two weather systems generate different swells.
- An existing swell continues traveling while another wave system develops.
- Local geography influences how waves approach the coastline.
The result can be an unusual pattern where wave crests intersect at different angles.
The Bottom Line
Square waves are one of those natural phenomena that look almost unreal. But they’re a good reminder that the ocean can be beautiful and dangerous at the same time.
If you spot a pronounced checkerboard-like pattern on the water, admire it from a safe location rather than getting into the ocean. Follow local beach warnings and lifeguard instructions, and don’t underestimate unusual wave conditions.
Sometimes the smartest way to experience an incredible natural phenomenon is simply to stay on the shore and watch it.
