what is cyclone ? how it occurs?

what is cyclone?

"Cyclone" usually refers to an extra-tropical (non-tropical) cyclone, which is a low pressure area that forms near the boundary between warm and cool air masses. (It alternatively refers to a hurricane that forms in the Indian Ocean).

As depicted in the illustrations above and below, the cyclone grows in size and intensity as it draws on the energy that is available from the temperature contrast between the two air masses. The leading edges of the airmasses that are moving are called fronts. The imaginary line where the warm air meets the cold air at the surface in advance of the low pressure center is called a warm front. Where the cold air advances upon the warm air is called a cold front.

how it occurs?

Formation
Main article: Cyclogenesis
Cold-core cyclones (most cyclone varieties) form due to the nearby presence of an upper level trough, which increases divergence aloft over an area that induces upward motion and surface low pressure. Warm-core cyclones (such as tropical cyclones and many mesocyclones) can have their initial start due to a nearby upper trough, but after formation of the initial disturbance, depend upon a storm-relative upper level high to maintain or increase their strength.
 
 



Each of the six main types of cyclone has further characteristics which define it as either a Polar cyclone, Polar low, Extratropical, Subtropical, Tropical, or Mesoscale.
 


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