What is a rogue wave?

A rogue wave , also called a freak, killer, or monster wave, is an unusually large, unpredictable, and hazardous water wave that can appear suddenly on the ocean surface. They can reach heights of up to 30 meters (nearly 100 feet) and are defined as being more than twice the size of surrounding waves. Rogue waves result from the coincidental stacking of multiple wave crests or from a combination of waves and currents. They pose a threat to ships, oil platforms, and lighthouses. The highest confirmed rogue wave, the Draupner wave, was measured at 25.9 meters (85 feet) at an oil-drilling platform off the coast of Norway in 1995.

How do rogue waves differ from normal ocean waves?

Rogue waves differ from normal ocean waves due to their unusual height and unpredictability. They can reach heights greater than twice the size of surrounding waves and emerge from unexpected directions, regardless of the prevailing wind and wave direction. Several mechanisms can cause rogue waves. One such mechanism is constructive interference, where smaller, faster waves merge with slower waves, causing oscillations to combine and form an unusually large wave. Although strong winds can play a role, rogue waves can also occur in relatively calm seas.

What causes a rogue wave to form?

Rogue waves , also called freak or killer waves, are unusually large, unpredictable ocean waves. They can reach up to 30 meters (nearly 100 feet) and are defined as being at least 2.2 times the significant wave height. Several mechanisms can cause rogue waves. One is constructive interference, where smaller, faster waves merge with slower ones, causing their oscillations to combine temporarily into an extremely large wave. Although strong winds can contribute, rogue waves can also occur in calm seas. These waves can move in any direction relative to the prevailing wind and wave motion.

Where are rogue waves most likely to occur in the ocean?

Rogue waves, also known as freak waves or killer waves, are unpredictable and unusually high water waves on the ocean's surface. They can reach heights greater than twice the size of surrounding waves and can move in any direction relative to the prevailing wind and wave motion. While it remains a mystery how frequently these events occur, analysis of satellite imagery suggests they happen more often than expected. The first indisputable evidence of rogue waves came in 1995, when scientists analyzed data recorded at the Draupner E oil-drilling platform off the coast of Norway in the North Sea. The most extreme rogue wave on record occurred in the Pacific Ocean near the coast of British Columbia in 2020.

How do scientists detect and study rogue waves?

Scientists detect and study rogue waves , also known as freak waves or extreme storm waves, using several methods. Analysis of satellite imagery helps determine how frequently these events occur. Data recorded at the Draupner E oil-drilling platform off the coast of Norway in 1995, using a laser wave gauge, provided the first indisputable evidence of rogue waves. The gauge measured a 25.9-meter wave crashing over the structure.

Why can rogue waves be dangerous for ships and offshore structures?

Rogue waves, also known as freak or killer waves, pose significant dangers to ships and offshore structures due to their unusual height and unpredictable nature. These extreme storm waves can reach heights of up to 30 meters (nearly 100 feet) and emerge from unexpected directions. They can move in any direction relative to prevailing wind and wave motion. The immense force of these waves can capsize vessels, wash crew members overboard, and inflict substantial damage to structures like oil-drilling platforms. The unpredictable nature and size of rogue waves make them a formidable threat to maritime safety.

rogue wave

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Three 3-D diagrams illustrate rogue wave formation among shorter and medium waves, showing how currents, wind, and intersecting swells create exceptionally large waves through energy focusing and constructive interference, with explanatory text about wave behavior and record heights.

The Great Wave off Kanagawa by Katsushika Hokusai shows a towering blue wave threatening boats, with Mount Fuji visible in the background.

Quick Facts

Also called:: extreme storm wave

Related Topics:: wave; What Makes a Wave Go Rogue?

On the Web:: National Center for Biotechnology Information - PubMed Central - Rogue Waves: From nonlinear schrodinger breather solutions to Sea-Keeping test (Oct. 17, 2026)

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rogue wave

hydrology

Also known as: extreme storm wave, freak wave, killer wave, monster wave(Show More)

Written by

Michael McDonoughAll

Fact-checked by

Britannica Editors

Last updated

Oct. 18, 2026 •History

Top Questions

What is a rogue wave?
A rogue wave, also called a freak, killer, or monster wave, is an unusually large, unpredictable, and hazardous water wave that can appear suddenly on the ocean surface. They can reach heights of up to 30 meters (nearly 100 feet) and are defined as being more than twice the size of surrounding waves. Rogue waves result from the coincidental stacking of multiple wave crests or from a combination of waves and currents. They pose a threat to ships, oil platforms, and lighthouses. The highest confirmed rogue wave, the Draupner wave, was measured at 25.9 meters (85 feet) at an oil-drilling platform off the coast of Norway in 1995.
2 Britannica Sources
1. rogue wave
2. What Makes a Wave Go Rogue?
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How do rogue waves differ from normal ocean waves?
Rogue waves differ from normal ocean waves due to their unusual height and unpredictability. They can reach heights greater than twice the size of surrounding waves and emerge from unexpected directions, regardless of the prevailing wind and wave direction.

Several mechanisms can cause rogue waves. One such mechanism is constructive interference, where smaller, faster waves merge with slower waves, causing oscillations to combine and form an unusually large wave. Although strong winds can play a role, rogue waves can also occur in relatively calm seas.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What causes a rogue wave to form?
Rogue waves, also called freak or killer waves, are unusually large, unpredictable ocean waves. They can reach up to 30 meters (nearly 100 feet) and are defined as being at least 2.2 times the significant wave height.

Several mechanisms can cause rogue waves. One is constructive interference, where smaller, faster waves merge with slower ones, causing their oscillations to combine temporarily into an extremely large wave. Although strong winds can contribute, rogue waves can also occur in calm seas. These waves can move in any direction relative to the prevailing wind and wave motion.
2 Britannica Sources
1. rogue wave
2. What Makes a Wave Go Rogue?
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Where are rogue waves most likely to occur in the ocean?
Rogue waves, also known as freak waves or killer waves, are unpredictable and unusually high water waves on the ocean's surface. They can reach heights greater than twice the size of surrounding waves and can move in any direction relative to the prevailing wind and wave motion.

While it remains a mystery how frequently these events occur, analysis of satellite imagery suggests they happen more often than expected. The first indisputable evidence of rogue waves came in 1995, when scientists analyzed data recorded at the Draupner E oil-drilling platform off the coast of Norway in the North Sea. The most extreme rogue wave on record occurred in the Pacific Ocean near the coast of British Columbia in 2020.
2 Britannica Sources
1. rogue wave
2. What Makes a Wave Go Rogue?
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How do scientists detect and study rogue waves?
Scientists detect and study rogue waves, also known as freak waves or extreme storm waves, using several methods. Analysis of satellite imagery helps determine how frequently these events occur. Data recorded at the Draupner E oil-drilling platform off the coast of Norway in 1995, using a laser wave gauge, provided the first indisputable evidence of rogue waves. The gauge measured a 25.9-meter wave crashing over the structure.
2 Britannica Sources
1. rogue wave
2. What Makes a Wave Go Rogue?
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Why can rogue waves be dangerous for ships and offshore structures?
Rogue waves, also known as freak or killer waves, pose significant dangers to ships and offshore structures due to their unusual height and unpredictable nature. These extreme storm waves can reach heights of up to 30 meters (nearly 100 feet) and emerge from unexpected directions. They can move in any direction relative to prevailing wind and wave motion. The immense force of these waves can capsize vessels, wash crew members overboard, and inflict substantial damage to structures like oil-drilling platforms. The unpredictable nature and size of rogue waves make them a formidable threat to maritime safety.
2 Britannica Sources
1. rogue wave
2. What Makes a Wave Go Rogue?
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

rogue wave, a relatively unpredictable and unexpectedly high water wave arising at the water’s surface and formed from the coincidental stacking of multiple wind-driven wave crests passing through a single point or arising from a combination of waves and currents that may shorten the waves’ frequency. Rogue waves tower to heights greater than twice the size of nearby waves, and they may move in either the same direction, the opposite direction, or at oblique angles to the prevailing wind and wave motion. They may be hazardous to ships at sea, capable of capsizing a vessel or washing crew members off the deck and into the ocean, and they are powerful enough to damage oil-drilling platforms and lighthouses. Rogue waves are distinguished from tsunamis, which are caused by submarine earthquakes, underwater or coastal landslides, or volcanic eruptions.

Unusually high waves resembling present-day rogue waves were the subject of folklore for several centuries. Even reports of 30-meter (100-foot) waves from such reputable figures as 19th-century French explorer and navigator Jules-Sébastien-César Dumont d’Urville were not taken seriously by his employers. In fact, the first indisputable evidence of rogue waves did not become available until nearly the end of the 20th century, from scientists analyzing data recorded at the Draupner E oil-drilling platform off the coast of Norway in the North Sea in 1995. A laser wave gauge mounted on the platform measured a 25.9-meter (85-foot) wave as it crashed over the structure. That wave was twice the height of those that came before and after it as well as being 6.4 meters (21 feet) higher than could be explained by any wave model existing at the time (see also scientific modeling). The “Draupner wave” is the highest confirmed rogue wave known. The most extreme rogue wave on record, however, occurred in the Pacific Ocean near the coast of British Columbia in 2020. Although its height, at 17.6 meters (57.7 feet), was somewhat less than the Draupner wave’s, it was more than three times higher than surrounding waves.

Unconfirmed reports of higher rogue waves also exist. One of the highest rogue waves is said to have occurred in 1933, when an estimated 34-meter (112-foot) wave crashed over the USS Ramapo in the North Pacific. Higher still was the wave that reportedly swept over a lighthouse at Trinidad Head, California, during the winter of 1914–15. The top of the lighthouse stood 53.3 meters (175 feet) above sea level, and records noted that the wave might have been as much as 61 meters (200 feet) high.

Michael McDonough John P. Rafferty

rogue wave

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