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www.nationalgeographic.org/news/rogue-waves

A rogue wave is usually defined as a wave that is two times the significant wave height of the area. The significant wave height is the average of the highest one-third of waves that occur over a given period. Therefore, a rogue wave is a lot bigger than the other waves that are happening in its vicinity around the same time.

en.wikipedia.org/wiki/Rogue_wave

Rogue waves may also occur in lakes. A phenomenon known as the "Three Sisters" is said to occur in Lake Superior when a series of three large waves forms. The second wave hits the ship's deck before the first wave clears. The third incoming wave adds to the two accumulated backwashes and suddenly overloads the ship deck with tons of water.

www.reference.com/science/rogue-waves-form-61c8a4aa68b7789a

Another cause of rogue waves is the focusing of wave energy. Storms create waves that go against the normal wave direction, shortening the wave frequency. This can cause waves to join up and create larger waves. Both of these are possible explanations for how rogue waves are caused. Rogue waves are monstrous, steep waves that appear out of nowhere.

www.answers.com/Q/Where_do_rogue_waves_occur

A rogue wave is a wind-driven ocean wave that forms when several wind-driven waves briefly combine to produce a much larger wave. Like other wind driven waves as rogue wave that reaches shore will ...

www.theinertia.com/environment/rogue-waves-are-actually-much-more-common-than...

Rogue waves in the North Sea actually occur twice a day during storms. ... Rogue Waves Are Actually Much More Common than We Thought. ... Rogue Waves Are Actually Much More Common than We Thought

en.wikipedia.org/wiki/List_of_rogue_waves

This list of rogue waves compiles incidents of known and likely rogue waves – also known as freak waves, monster waves, killer waves, and extreme waves.These are dangerous and rare ocean surface waves that unexpectedly reach at least twice the height of the tallest waves around them, and are often described by witnesses as "walls of water". They occur in deep water, usually far out at se...

www.quora.com/How-often-do-rogue-waves-reach-shore

Never. Rogue waves don't really travel. Say what? I'll explain. Rogue waves occur when the peaks of many different waves happen to align. Ocean waves are the random superposition of several sinusoidal wave components, each with a certain wave he...

science.howstuffworks.com/environmental/earth/oceanography/rogue-wave2.htm

When such waves run into a strong current, the current can increase wave heights and cause the waves to break. This would explain monster waves 98 feet (30 meters) high or more, and account for the "wall of water" effect. Rogue waves frequently occur in areas known for strong ocean currents.

oceanservice.noaa.gov/facts/roguewaves.html

A rogue wave estimated at 18.3 meters (60 feet) in the Gulf Stream off of Charleston, S.C. At the time, surface winds were light at 15 knots. The wave was moving away from the ship after crashing into it moments before this photo was captured. Rogue, freak, or killer waves have been part of marine ...