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 km/h, ‘calm’) to force 12 (64 knots or 118 km/h 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).’
- ‘As the wind blew harder, the tower's coloured neon rings would get brighter, like a visual display of the Beaufort scale.’
- ‘A wind is not regarded a gale until it reaches about twice this speed - between 60 and 75 km/h, or eight on the Beaufort scale.’
- ‘The Beaufort scale, of course, has become a part of the standard operating lingo for meteorologists and sailors.’
- ‘These surveys were carried out at a sea state of Beaufort scale 3 and always covered the entire inner lagoon, unless deteriorating weather conditions truncated a survey.’
Mid 19th century named after Sir Francis Beaufort (1774–1857), the English admiral and naval hydrographer who devised it.