Draupner wave

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The Draupner wave, a single giant wave measured on New Year's Day 1995, confirmed the existence of freak waves, which had previously been considered near-mythical.
Close-up of the event, taken from Paul Taylor's paper.

The Draupner wave or New Year's wave is often believed to be the first rogue wave to be detected by a measuring instrument, occurring at the Draupner platform in the North Sea off the coast of Norway on 1 January 1995. Yet, prior to the publicity made about that measurement, other cases such as that of the Weather Forecaster [1] had confirmed that such freak waves exist through anecdotal evidence provided by those who had encountered them at sea.

Minor damage was inflicted on the platform during this event, confirming the validity of the reading made by a downwards-pointing laser sensor. In an area with significant wave height of approximately 12 metres (39 ft), a freak wave with a maximum wave height of 25.6 metres (84 ft) occurred (peak elevation was 18.5 metres (61 ft)).