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   Beau·fort scale

   /ˈbōfərt ˌskāl/

   noun

   • 1. a scale of wind speed based on a visual estimation of the wind's effects, ranging from force 0 (less than 1 knot or 1 mph, “calm”) to force 12 (64 knots or 74 mph and above, “hurricane”).

   Word Origin mid 19th century: named after Sir Francis Beaufort (1774–1857), the English admiral and naval hydrographer who devised it.

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