Cyclones are air masses, which move violently from the tropical areas having hot air. The surrounding colder air flows towards them with a whirling movement, which spiral upwards. The atmospheric disturbance caused by this moving mass of air is called cyclone.
Cyclones blow from west to east causing extensive damage to areas through which they pass. According to the weather maps, there are permanent cyclonic areas in the Northern Atlantic and Pacific oceans.
Below Cyclones info from Wikipedia (Read More):-
In meteorology, a cyclone refers to an area of closed, circular fluid motion rotating in the same direction as the Earth[1][2]. This is usually characterized by inward spiraling winds that rotate counter clockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere of the Earth.
Large-scale cyclonic circulations are almost always centred on areas of low atmospheric pressure[3][4]. The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones which lie on the synoptic scale. Warm-core cyclones such as tropical cyclones, mesocyclones, and polar lows lie within the smaller mesoscale. Subtropical cyclones are of intermediate size.[5][6] Cyclones have also been seen on other planets outside of the Earth, such as Mars and Neptune.
http://en.wikipedia.org/wiki/Cyclone
