Cyclone Yaas

News: Cyclone Yaas developing in the Bay of Bengal. The name ‘Yaas’ was suggested by Oman and refers to a tree with good fragrance and in English, the word is similar to Jasmine. The next cyclone—after Yaas—is likely to be named Gulab, suggested by Pakistan.

How are cyclones formed?

  • Cyclones are formed over the oceanic water in the tropical region. In this region, the sunlight is highest which results in warming of land and water surface. Due to warming of the surface, the warm moist air over the ocean rises upwards following which cool air rushes in to fill the void, they too get warm and rise — the cycle continues.

Why is the Bay of Bengal More Prone to Cyclones?

  • The low-pressure system of cyclone needs a continuous supply of heat energy and as the Bay of Bengal is warmer than the Arabian sea, it is able to provide the heat energy needed to sustain the low-pressure system.
  • Sea surface temperatures and humidity both directly correlate with chances of cyclone formation.
  • The Bay of Bengal receiveshigher rainfall and constant inflow of fresh water from the Ganga and Brahmaputra rivers. This means that the Bay’s surface water keeps getting refreshed, making it impossible for the warm water to mix with the cooler water below, making it ideal for depression.
  • On the other hand, the Arabian Sea receives stronger winds that help dissipate the heat, and the lack of constant fresh water supply helps the warm water mix with the cool water, reducing the temperature.
  • Absence of large landmass between the Pacific and the Bay, allows cyclonic winds to easily move into the Bay of Bengal. Cyclones from Pacific Oceanlow-pressure system originating from the Pacific Ocean also travel towards the left to the Bay of Bengal.