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significant wave height The statistical term used to describe wave height in a sea state made up of waves of many different heights. It is the average height of the highest one third of all waves present. It is intended to represent the wave height that might be perceived and used by an experienced seaman when describing the sea state. It generally applies to the wind waves, as opposed to the swell. It is sometimes abbreviated SWH. Significant wave height is illustrated in WXT G239 along with a presentation of the rest of the wave height distribution in terms of SWH. Most marine weather reports use SWH to describe the seas, although this is not often clearly stated. A report of 6 foot waves and 8 foot swells, means the predicted or observed significant wave height of the seas is 6 feet, which in turn would be statistically combined with a swell of near constant height of 8 feet. See swell. See also Quick Notes on Waves in WXT G217. See swell.

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