A system of winds rotating around a center of low atmospheric pressure. A cyclone rotates counterclockwise in the northern hemisphere and clockwise in the southern hemisphere (opposite to that of an anticyclone). Modern meteorology restricts the use of the term cyclone to the cyclonic-scale circulations. But, it is still applied popularly to the more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils (which may in fact exhibit anticyclonic rotation), and even, very loosely, to any strong wind. Because cyclonic circulation and relative low atmospheric pressure usually coexist, in common practice the terms cyclone and low are used interchangeably. Also, because cyclones nearly always are accompanied by inclement (sometimes destructive) weather, they are frequently referred to simply as storms
A Southeastern and Indian Ocean weather phenomenon that results in wind speeds of around 150 to 200 km/h
A large area of low atmospheric pressure, characterised by inward-spiralling winds A "low"
An area of low pressure where winds blow counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere See anticyclone, wind
a violent rotating windstorm (meteorology) rapid inward circulation of air masses about a low-pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
It is attended by high temperature, moist air, abundant precipitation, and clouded sky
an area of low pressure, with circulation counterclockwise in the northern hemisphere and clockwise in the southern hemisphere (See also anticyclone, Coriolis force, atmospheric pressure)
The term includes the hurricane, typhoon, and tropical storms; it should not be applied to the moderate disturbances attending ordinary areas of low pressure nor to tornadoes, waterspouts, or "twisters,"
Area of low pressure in the atmosphere that displays circular inward movement of air In the Northern Hemisphere circulation is counterclockwise, while Southern Hemisphere cyclones have clockwise wind patterns
An area of low atmospheric pressure with converging and ascending air flows that rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere
This center moves onward, often with a velocity of twenty or thirty miles an hour
a large-scale circulation of winds around a central region of low atmospheric pressure, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere
alternative name for a depression, an area of low atmospheric pressure A severe cyclone that forms in the tropics is called a tropical cyclone
An area of low atmospheric pressure characterized by rotating and converging winds and ascending air
A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure
(meteorology) rapid inward circulation of air masses about a low-pressure center; circling counterclockwise in the northern hemisphere and clockwise in the southern
An area of closed pressure circulation with rotating and converging winds The circulation is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere Also called a low pressure system and the term used for tropical cyclone in the Indian Ocean Other phenomena with cyclonic flow may be referred to as dust devils, tornadoes, tropical and extratropical systems
An area of low pressure Winds blow in a counter clockwise direction in the Northern Hemisphere and in a clockwise direction in the Southern Hemisphere Inclimate weather is associated with a cyclone
A circulating air mass that rotates counterclockwise in the northern hemisphere and clockwise in the southern hemisphere Also used in many parts of the eastern hemisphere as synonymous to "hurricane"
An area of low pressure around which winds blow counterclockwise in the Northern Hemisphere Also the term used for a hurricane in the Indian Ocean and in the Western Pacific Ocean
A cyclone is a violent tropical storm in which the air goes round and round. a very strong wind that moves very fast in a circle hurricane, typhoon typhoon (kykloma , from kykloun , from kyklos; CYCLE). 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
An area of low atmospheric pressure which has a closed circulation that is cyclonic (counterclockwise in northern hemisphere and clockwise in southern hemisphere)
An area of low atmospheric pressure with winds blowing around it, counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere
synoptic scale weather system with winds in the low troposphere rotating about the local vertical in the same sense as the local terrestrial surface but faster (i e counterclockwise on a northern hemisphere map) Also a local name for a severe tropical cyclone in the Indian Ocean
An area of low pressure around which strong winds circulate clockwise I the southern hemisphere and anticlockwise in the northern hemisphere
In the Northern Hemisphere, the closed counter-clockwise movement of air referred to as a circulation - around a low pressure centre; typically known as a low Often this term is used in error to describe a tornado Dew Point The dewpoint is a measure of atmospheric moisture It is the temperature to which air must be cooled in order to reach saturation (assuming that air pressure and moisture content are constant) As the surface of the earth cools at night, warm moist air near the ground is chilled and water vapour in the air condenses into droplets on the grass and other objects Dew is particularly heavy on clear nights, when the earth cools rapidly When a blanket of cloud insulates the earth, the cooling rate is slower The greater the difference between the temperature and the dew point, the drier the air
An area of closed pressure circulation with rotating and converging winds, the center of which is a relative pressure minimum The circulation is counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere Also called a low pressure system and the term used for a tropical cyclone in the Indian Ocean Other phenomena with cyclonic flow may be referred to by this term, such as dust devils, tornadoes, and tropical and extratropical systems The opposite of an anticyclone or a high pressure system
In the Northern Hemisphere, a closed counter-clockwise movement of air-known as a circulation - around a low pressure centre; usually called a low The term is frequently misused to describe a tornado
Counter-clockwise rotating area of air that usually denotes unsettled weather A hurricane is a (warm-core) cyclone
An atmospheric closed circulation rotating counter-clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere
A system of winds rotating around a center of low atmospheric pressure A cyclone rotates counterclockwise in the northern hemisphere and clockwise in the southern hemisphere (opposite to that of an anticyclone) Modern meteorology restricts the use of the term cyclone to the cyclonic- scale circulations But, it is still applied popularly to the more or less violent, small-scale circulations such as tornadoes, waterspouts, and dust devils (which may in fact exhibit anticyclonic rotation), and even, very loosely, to any strong wind Because cyclonic circulation and relative low atmospheric pressure usually coexist (in the northern hemisphere), in common practice the terms cyclone and low are used interchangeably Also, because cyclones nearly always are accompanied by inclement (sometimes destructive) weather, they are frequently referred to simply as storms
Tropical revolving storm Caused by warm moist air rising quickly into low pressure systems in the southern hemisphere
In general, a condition of the atmosphere characterized by a central area of pressure much lower than that of surrounding areas, and a system of winds blowing inward and around (clockwise in the southern hemisphere and counter-clockwise in the northern); called also a low-area storm
are high-pressure air masses that rotate in a counter clockwise direction in the Northern Hemisphere and clockwise in the Southern Hemisphere Cyclones are usually warmer air masses as compared to the temperature of the surrounding air A cyclone is not the same as a tornado The opposite of a cyclone is an anticyclone
Cone-shaped devices that separate materials by centrifugal action They are used in the phosphate industry to separate clays from the matrix and to recover dust from air streams
of or relating to or characteristic of a violent tropical storm; "cyclonic destruction" of or relating to or characteristic of the atmosphere around a low pressure center; "cyclonic cloud pattern
A violent storm originating over tropical or subtropical waters, characterized by violent rainstorms and high-velocity cyclonic winds. Severe atmospheric disturbance in tropical oceans. Tropical cyclones have very low atmospheric pressures in the calm, clear centre (the eye) of a circular structure of rain, cloud, and very high winds. In the Atlantic and Caribbean they are called hurricanes; in the Pacific they are known as typhoons. Because of the Earth's rotation, tropical cyclones rotate clockwise in the Southern Hemisphere and counterclockwise in the Northern. They may be 50-500 mi (80-800 km) in diameter, and sustained winds in excess of 100 mph (160 kph) are common. In the eye, however, the winds drop abruptly to light breezes or even complete calm. The lowest sea-level pressures on Earth occur in or near the eye
[ 'sI-"klOn ] (noun.) 1848. From Ancient Greek κυκλῶν (kuklōn), present active participle of κυκλόω (kukloō, “I encircle”) from κύκλος (kuklos, “circle”)