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”).
- Typhoon Rananim brought hurricanes of force 12 on the Beaufort scale when it landed.
- By now the sea was running hard, Force 10 on the Beaufort scale, estimated Thomson, and the euphoria brought on by the beauty of the ice pack was being rapidly replaced by terror at the thought of an icy lonely death.
- Numbers near the winds indicate their magnitude in the Beaufort scale (force 3 is equivalent to 3.6-5.1 m/s; force 5 to 8.7-10.8 m/s).
Mid 19th century: named after Sir Francis Beaufort (1774–1857), the English admiral and naval hydrographer who devised it.
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