Beaufort scale(redirected from Bft)
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A scale of wind force ranging from 0 (calm) to 12 (hurricane), corresponding with the velocity of wind at a set distance above ground or sea level.
[After Sir Francis Beaufort (1774-1857), British naval officer.]
(Physical Geography) meteorol an international scale of wind velocities ranging for practical purposes from 0 (calm) to 12 (hurricane force). In the US an extension of the scale, from 13 to 17 for winds over 64 knots, is used
[C19: after Sir Francis Beaufort (1774–1857), British admiral and hydrographer who devised it]
Beau′fort scale′(ˈboʊ fərt)
a scale for indicating the force or speed of wind, using numbers from 0 to 12 or sometimes 17.
[1855–60; after Sir Francis Beaufort (1774–1857)]
A scale for classifying the force of the wind, ranging from 0 (calm) to 12 (hurricane). The scale was devised in 1805 as a means of describing the effect of different wind velocities on ships at sea.
(wind scale) A scale that rates the force of wind from 0 to 12, a rating of 0 being absolute calm and one of 12 being hurricane force.
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|Noun||1.||Beaufort scale - an international scale of wind force from 0 (calm air) to 12 (hurricane)|
light air - wind moving 1-3 knots; 1 on the Beaufort scale
light breeze - wind moving 4-7 knots; 2 on the Beaufort scale
gentle breeze - wind moving 8-12 knots; 3 on the Beaufort scale
moderate breeze - wind moving 13-18 knots; 4 on the Beaufort scale
fresh breeze - wind moving 19-24 knots; 5 on the Beaufort scale
strong breeze - wind moving 25-31 knots; 6 on the Beaufort scale
fresh gale - wind moving 39-46 knots; 8 on the Beaufort scale
strong gale - wind moving 47-54 knots; 9 on the Beaufort scale
whole gale - wind moving 55-63 knots; 10 on the Beaufort scale
storm, violent storm - a violent weather condition with winds 64-72 knots (11 on the Beaufort scale) and precipitation and thunder and lightning
hurricane - a severe tropical cyclone usually with heavy rains and winds moving a 73-136 knots (12 on the Beaufort scale)
|2.||Beaufort scale - a scale from 0 to 12 for the force of the wind|