Large air mass rotating around a strong centre with low pressure is defined as Cyclone in meteorology.
Following are the characteristics of Cyclones:
- The inward spiralling winds turn anti-clockwise in the Northern Hemisphere.
- They turn clockwise in the Southern Hemisphere.
- Every large-scale cyclone is centered on areas of low atmospheric pressure.
- The largest low-pressure systems are cold-core polar cyclones and extratropical cyclones of the largest scale (synoptic scale).
- Cyclones with warm-core such as subtropical cyclones and astropical cyclones fall within the synoptic scale, according to the National Hurricane Center glossary
- Dust devils, tornadoes and mesocyclones, lie within the smaller mesoscale.
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