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Extract from the weather journal
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Waves can be described as either swell waves or sea waves. Sea waves are generally generated locally and move in the same direction as the wind. They have a more irregular appearance. Swell waves have been generated elsewhere, move out of their area, and travel in regular succession and in a well-defined direction. Waves travel in groups, or "sets". The higher waves occur near the centre of the group. To estimate wave height, average only
the well-developed waves in the centre of the group. At least 15-20 waves should be noted.