Beaufort scale

/boh"feuhrt/, (no longer in technical use)
1. a scale of wind forces, described by name and range of velocity, and classified as from force 0 to force 12, or, sometimes, to force 17.
2. a scale of the states of sea created by winds of these various forces up to and including force 10.
[1855-60; named after Sir Francis Beaufort (1774-1857), British admiral who devised it]

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in full  Beaufort wind force scale 
 scale devised in 1805 by Comdr. (later Admiral and Knight Commander of the Bath) Francis Beaufort of the British Navy for observing and classifying wind force at sea. Originally based on the effect of the wind on a full-rigged man-of-war, in 1838 it became mandatory for log entries in all ships in the Royal Navy. Altered to include observations of the state of the sea and phenomena on land as criteria, it was adopted in 1874 by the International Meteorological Committee for international use in weather telegraphy.

       Beaufort scale of wind (nautical)The Beaufort scale as originally drawn up made no reference to the speed of the wind, and various attempts, particularly during the 20th century, have been made to correlate the two. An attempt made in 1912 by the International Commission for Weather Telegraphers was interrupted by World War I. In 1921 G.C. Simpson was asked to formulate equivalents, which were accepted in 1926 by the Committee. In June 1939 the International Meteorological Committee adopted a table of values referring to an anemometer at a height of 6 metres (20 feet). This was not immediately adopted by the official weather services of the United States and Great Britain, which used the earlier scale referring to an anemometer at an elevation of 11 metres (36 feet). The Beaufort force numbers 13 to 17 were added by the U.S. Weather Bureau in 1955 (see Table (Beaufort scale of wind (nautical))).

       Beaufort scale of wind (nautical)The scale is now rarely used by professional meteorologists, having been largely replaced by more objective methods of determining wind speeds. Nevertheless, it is still useful in estimating the wind characteristics over a large area, and it may be used to estimate the wind where there are no wind instruments. The Beaufort scale also can be used to measure and describe the effects of different wind velocities on objects on land or at sea. As is evident in the Table (Beaufort scale of wind (nautical)), the terms for winds that are used by the U.S. National Weather Service sometimes differ from those used by other countries.

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Universalium. 2010.

Look at other dictionaries:

  • Beaufort scale — [bō′fərt] n. [after Sir Francis Beaufort (1774 1857), Brit naval officer who devised the original scale (1806)] a scale of wind force and speed: see the Reference Supplement …   English World dictionary

  • Beaufort scale — ► NOUN ▪ a scale of wind speed ranging from force 0 to force 12. ORIGIN named after the English admiral Sir Francis Beaufort (1774 1857) …   English terms dictionary

  • Beaufort scale — to measure wind velocity, developed 1806 by Francis Beaufort (1774 1857), surveyor and hydrologist …   Etymology dictionary

  • Beaufort scale — Force 12 at sea. The Beaufort Scale (  / …   Wikipedia

  • Beaufort scale —    an empirical scale, first devised by the British admiral Sir Francis Beaufort (1774 1857), for estimating wind speed by observing the effects of the wind. Using the scale, sailors can judge the wind velocity by observing the wind s effects on… …   Dictionary of units of measurement

  • Beaufort scale — A set of descriptive terms of wind strength, evolved according to the effect of wind upon sailing craft and sea disturbance. Captain Beaufort devised the scale in 1806. The scale is depicted in the illustration. (See page 102) …   Aviation dictionary

  • Beaufort scale — Beau′fort scale′ [[t]ˈboʊ fərt[/t]] n. mer a scale for indicating the force or speed of wind, using numbers from 0 to 12 or sometimes 17 • Etymology: 1855–60; after Sir Francis Beaufort (1774–1857) …   From formal English to slang

  • Beaufort scale — noun Etymology: Sir Francis Beaufort Date: 1858 a scale in which the force of the wind is indicated by numbers from 0 to 12 …   New Collegiate Dictionary

  • Beaufort scale — noun An empirical measure for the intensity of the wind based mainly on the state of the sea or wave conditions. Syn: Beaufort wind force scale …   Wiktionary

  • Beaufort scale — [ bəʊfət] noun a scale of wind speed ranging from 0 (calm) to 12 (hurricane). Origin C19: named after Sir Francis Beaufort, the English admiral who devised it …   English new terms dictionary

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