Beaufort wind scale
ranges of wind speeds which are reported as nautical miles per hour in marine weather forecasts while general weather forecasts report wind speeds in kilometres per hour. Beaufort values 13 to 17 have wind speeds in knots at 72-80, 81-89, 90-99, 100-109 and 110-118 without any verbal descriptions of sea conditions:
Beaufort scale -- State of air -- Wind speed (knots) -- Wind speed (km/h) -- Sea conditions
0 -- Calm -- 0-1 -- 0-1
Like a mirror
1 -- Light airs -- 1-3 -- 1-5
Ripples
2 -- Light breeze -- 4-6 -- 6-11
Small wavelets
3 -- Gentle breeze -- 7-10 -- 12-19
Small waves, fairly frequent whitecaps
4 -- Moderate breeze -- 11-16 -- 20-29
Small waves, fairly frequent whitecaps
5 -- Fresh breeze -- 17-21 -- 30-39
Moderate waves, many whitecaps
6 -- Strong breeze -- 22-27 -- 40-50
Large waves begin to form, white foam crests more extensive every-where
7 -- Near gale -- 28-33 -- 51-61
Sea heaps up, white foam from breaking waves blown in streaks along direction of wind
8 -- Fresh gale -- 34-40 -- 62-74
Moderately high waves of greater length, edges of crests break into spin-drift, foam blown in well-marked streaks along direction of wind
9 -- Strong gale -- 41-47 -- 75-86
High waves, dense streaks of foam blown along direction of wind, crests of waves begin to topple, tumble and roll over, spray may affect visibility
10 -- Whole gale -- 48-55 -- 87-100
Very high waves with long overhanging crests, foam in great patches blown in dense white streaks along direction of wind, surface on the whole becomes white, tumbling of the sea becomes heavy and shock-like, visibility affected
11 -- Storm -- 56-63 -- 101-117
Exceptionally high waves, small and medium-sized vessels may be lost to view for long periods, sea completely covered with long white patches of foam along direction of wind, everywhere the edges of wave crests are blown into froth, visibility affected
12 -- Hurricane -- >63 -- >117
Air filled with foam and spray, sea completely white with driving spray, visibility very seriously affected

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • Beaufort's scale — Beau fort s scale (Meteor.) A scale of wind force devised by Sir F. Beaufort, R. N., in 1805, in which the force is indicated by numbers from 0 to 12. [1913 Webster] Note: The full scale is as follows: 0, calm; 1, light air; 2, light breeze; 3,… …   The Collaborative International Dictionary of English

  • wind scale — n. a scale used in meteorology to designate relative wind intensities, as the Beaufort scale …   English World dictionary

  • wind scale — noun an international scale of wind force from 0 (calm air) to 12 (hurricane) • Syn: ↑Beaufort scale • Hypernyms: ↑scale, ↑scale of measurement, ↑graduated table, ↑ordered series …   Useful english dictionary

  • wind scale — /wind/ a numerical scale, as the Beaufort scale, for designating relative wind intensities. [1905 10] * * * …   Universalium

  • wind scale — /ˈwɪnd skeɪl/ (say wind skayl) noun a numerical scale, like the Beaufort scale, for designating relative wind intensities …   Australian English dictionary

  • Wind — For other uses, see Wind (disambiguation). Wind, from the …   Wikipedia

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

  • 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… …   Universalium

  • Beaufort , Sir Francis — (1774–1857) British hydrographer Beaufort was born in Navan in Ireland; his father was a cleric of Huguenot origin who took an active interest in geography and topography, publishing in 1792 one of the earliest detailed maps of Ireland. Beaufort… …   Scientists

  • 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

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