- /suy"klohn/, n.1. a large-scale, atmospheric wind-and-pressure system characterized by low pressure at its center and by circular wind motion, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere. Cf. anticyclone, extratropical cyclone, tropical cyclone.2. (not in technical use) tornado.3. Also called cyclone collector, cyclone separator. Mach. a device for removing small or powdered solids from air, water, or other gases or liquids by centrifugal force.[term introduced by British meteorologist Henry Piddington (1797-1858) in 1848, perh. < Gk kyklôn revolving (prp. of kykloûn to revolve, v. deriv. of kýklos; see CYCLE); appar. confused by Piddington with kýkloma wheel, snake's coil]
* * *Any large system of winds that circulates about a centre of low atmospheric pressure in a counterclockwise direction north of the Equator and in a clockwise direction south of it.Cyclones that occur in the mid-and high latitudes are known as extratropical cyclones; they are frequently preceded by thickening and lowering clouds, followed by precipitation. Cyclones that form in the lower latitudes are known as tropical cyclones; smaller than extratropical cyclones, they tend to be more violent and can cause considerable damage (see tropical cyclone). Wind systems that circulate around a high-pressure centre in directions opposite to that of cyclones are known as anticyclones.
* * *any large system of winds that circulates about a centre of low atmospheric pressure in a counterclockwise direction north of the Equator and in a clockwise direction to the south. Cyclonic winds move across nearly all regions of the Earth except the equatorial belt and are generally associated with rain or snow. Also occurring in much the same areas are anticyclones, wind systems that rotate about a high-pressure centre. Anticyclones (anticyclone) are so called because they have a flow opposite to that of cyclones—i.e., an outward-spiralling motion, with the winds rotating clockwise in the Northern Hemisphere and counterclockwise in the Southern. These winds are usually not as strong as the cyclonic variety and commonly produce no precipitation. A brief treatment of cyclones follows. For full treatment, see climate: Cyclones and anticyclones (climate).Cyclones occur chiefly in the middle and high latitude belts of both hemispheres. In the Southern Hemisphere, where most of the terrestrial surface is covered by the oceans, cyclones are distributed in a relatively uniform manner through various longitudes. Characteristically, they form in latitudes 30° to 40° S and move in a generally southeasterly direction, reaching maturity in latitudes around 60°. The situation is quite different in the Northern Hemisphere. There, continental landmasses extend from the Equator to the Arctic, and large mountain belts interfere with the midlatitude air currents, giving rise to significant variations in the occurrence of cyclones (and anticyclones). Certain tracks are favoured by the wind systems. The principal cyclone tracks lie over the oceans, regularly traversing to the east of both mountain barriers and continental coastlines.Cyclones that form closer to the Equator (i.e., at latitudes 10° to 25° north and south over the oceans) differ somewhat in character from the extratropical variety. Such wind systems, known as tropical cyclones, are much smaller in diameter. Whereas extratropical cyclones range from nearly 1,000 to 4,000 kilometres (620 to 2,500 miles) across, tropical cyclones typically measure only about 100 to over 1,000 kilometres in diameter. They also tend to be more violent than those occurring in the midlatitudes and can cause considerable damage. Their wind velocities may reach up to 90 metres per second (200 miles per hour), as opposed to a maximum of about 30 metres per second (67 miles per hour) for extratropical cyclones. In the Atlantic and Caribbean regions, tropical cyclones with winds of at least 33 metres per second (74 miles per hour) averaged over one-minute intervals are called hurricanes, while in the western Pacific and China Sea, the term typhoon is applied.
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cyclone — [ siklon ] n. m. • 1860; mot angl., du gr. kuklos « cercle » 1 ♦ Bourrasque en tourbillon; vent très violent. Météorol. Tempête caractérisée par le mouvement giratoire convergent et ascendant du vent autour d une zone de basse pression où il a… … Encyclopédie Universelle
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Cyclone — Cyclone; cyclone; peri·cyclone; meso·cyclone; … English syllables
Cyclone — Cy clone (s? kl?n), n. [Gr.????? moving in a circle, p. pr. of ?????, fr. ky klos circle.] 1. (Meteor.) A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves … The Collaborative International Dictionary of English
cyclone — 1848, coined by British East India Co. official Henry Piddington to describe the devastating storm of December 1789 in Coringa, India; irregularly formed from Gk. kyklon moving in a circle, whirling around, prp. of kykloun move in a circle, whirl … Etymology dictionary
cyclone — *whirlwind, typhoon, hurricane, tornado, waterspout, twister … New Dictionary of Synonyms
cyclone — ► NOUN 1) a system of winds rotating inwards to an area of low barometric pressure; a depression. 2) a tropical storm. DERIVATIVES cyclonic adjective. ORIGIN probably from Greek kukl ma wheel, coil of a snake … English terms dictionary
cyclone — [sī′klōn΄] n. [altered < cyclome (< Gr kyklōma, wheel), infl. by Gr kyklōn, moving in a circle < kykloein, to circle around, whirl < kyklos: see WHEEL] 1. loosely a windstorm with a violent, whirling movement; tornado or hurricane 2.… … English World dictionary
Cyclone — This article is about the meteorological phenomenon. For other uses, see Cyclone (disambiguation). Polar low over the Barents Sea on February 27, 1987 In meteorology, a cyclone is an area of closed, circular fluid motion rotating in the same… … Wikipedia