How surfers can predict wave height just by reading the wind The SMB method is a semi-empirical system that estimates wave height and period from wind speed, fetch, or duration. It assumes deep water and steady wind blowing over an open water surface.

If a weather map shows a 30 kilometers per hour wind (that's 8.3 m/s) blowing across 200 kilometers of open ocean for several hours, you'll probably get around head-high surf.

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