Sneaker waves are common on the Oregon coast and they really can sneak up on you, if you're not careful. These unpredictable waves often happen when other waves bounce off complex terrain on the coast and create conditions for one big, dangerous wave. This is how the Oregon Parks Department describes sneaker waves:
They´re called sneaker waves because they appear without warning, often surging high up on the beach with deadly force, and are impossible to predict. Sneaker waves also carry a large amount of sand that can saturate your clothes, weighing you down and making escape difficult if not impossible.
How to play it safe: Never turn your back on the ocean.
via Oregon Parks and Recreation Department
"Never turn your back on the ocean." Solid advice.