What are Twin Cyclones ?

Twin Cyclones

Team Ambitiousbaba are here with a Current Affairs Special Series. In this series, candidates will be introduced to current affairs topics daily, which will not only improve their general awareness but also will ensure that the candidates do not lack in any current affairs topic. Today’s Current Affairs topic is “Twin Cyclones

Recently some pictures were captured from the Indian Ocean region. One is in the northern hemisphere and the other one is in the southern hemisphere, named cyclone Asani and cyclone Karim respectively.

What is Cyclone Karim?

  • Karim is a cyclone with a wind speed of 112 kilometres per hour (kmph).
  • It is categorised under the category II hurricane.
  • It has created a path in the open seas west of Australia.
  • The name to the cyclone was given by South African Country Seychelles.

What is Cyclone Asani?

  • Asani is a cyclone with wind speeds of 100-110 kmph gusting to 120 kmph.
  • It remains as a Severe Cyclonic Storm over the Bay of Bengal.
  • The name to the cyclone was suggested by Sri Lanka.

Similarities between the two cyclones:

  • They formed in the Indian Ocean.
  • Both originates in the same longitude and now drifting apart.
  • The interaction of the wind and the monsoon when combines with the earth then it produces these cyclones.
  • These twin cyclones are caused by equatorial Rossby waves.

About Rossby waves:

  • Rossby waves are huge waves in the ocean.
  • It has the wavelength of 4,000–5,000 km.
  • These waves are named after the famous meteorologist Carl-Gustaf Rossby.
  • Very often twin cyclones are formed from these Rossby waves.

Formation of Cyclone:

  • When the vorticity is positive in both Northern and Southern hemispheres.
  • In case with Rossby waves, the air in the boundary layer is moist and is lifted slightly.
  • When the air is lifted slightly, the water vapour condenses to make clouds. As it condenses, it lets out the latent heat of evaporation.
  • The ocean’s surface temperature has to be 27 degrees or warmer; the wind shear in the atmosphere must not be too high.
  • Once they are stronger, they will spin faster and faster and organise themselves into the big storms.

Cyclones moving to different hemispheres:

  • Yes, once formed they will generally move west.
  • In the Northern Hemisphere, they will have a slightly northerly component of motion and in the southern hemisphere a slightly southern component.

Who gave rise to the twin cyclones?

  • The Madden-Julian Oscillation is a large cluster of clouds and convection which gave rise to the twin cyclones.
  • The size of the MJO is about 5,000-10,000 km.
  • It is composed of a Rossby wave and a Kelvin wave.

Questions and Answer

Q.1. What is the wavelength of Rossby waves?

Ans. 4,000–5,000 km

Q.2. Cyclone Asani, name of the cyclone is named by which country?

Ans. Sri Lanka

Q.3. Cyclone Karim and Asani is formed in which ocean?

Ans. The Indian Ocean


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