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Twin cyclones

Date: 17 May 2022 Tags: Geography & Environment

Issue

Satellite images had recently shown that two cyclones were formed in the Indian Ocean Region. One has been named Asani while the other is named Karim.

 

Background

Both the cyclones were formed at the same longitude but on the either side of the equator.

 

Details

Cyclone Asani will move along the Andhra Pradesh coast before weakening. Karim will move towards Australia before dispersing.

 

Formation

  • These synchronous cyclones are formed by effects of wind and the monsoon system combined with the Earth system.

  • Twin cyclones are formed by equatorial Rossby waves. They are huge waves with wavelengths of around 4,000–5,000 kilometres. 

  • The system has a vortex in the northern hemisphere and another in the southern hemisphere, with each being mirror image of another.

  • The northern vortex spins counterclockwise and has a positive spin, while the other spins in the clockwise direction and therefore has a negative spin. 

 

Movement

Once they are formed, the one in northern hemisphere moved towards north-west whereas the one in the south goes south-west.

 

Formation of tropical cyclones

  • When light warm air is lifted, the water vapor is condensed to form clouds. The latent heat of evaporation warms the region and a positive feedback is set off by this process. 

  • As warm air lifts further, it forms dark clouds. The system turns into a cyclone if certain conditions are met.

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