Rogue waves seem not to have a single distinct cause, but occur where physical factors such as high winds and strong currents cause waves to merge to create a single exceptionally large wave. Therefore, rogue waves are not necessarily the biggest waves found on the water they are, rather, unusually large waves for a given sea state. In oceanography, rogue waves are more precisely defined as waves whose height is more than twice the significant wave height ( H s or SWH), which is itself defined as the mean of the largest third of waves in a wave record. A rogue wave appearing at the shore is sometimes referred to as a sneaker wave. They are distinct from tsunamis, which are often almost unnoticeable in deep waters and are caused by the displacement of water due to other phenomena (such as earthquakes). Rogue waves (also known as freak waves, monster waves, episodic waves, killer waves, extreme waves, and abnormal waves) are unusually large, unpredictable, and suddenly appearing surface waves that can be extremely dangerous to ships, even to large ones. A merchant ship labouring in heavy seas as a large wave looms ahead, Bay of Biscay, c.

Download free lego unexpected gathering