Cyclone Mocha

  • Cyclone Mocha, a tropical cyclone, has developed due to storm in southeast Bay of Bengal.
  • Mocha (Mokha) name was suggested by Yemen after Red Sea port city, which is known to have introduced coffee to the world over 500 years ago.

About Tropical cyclones

  • Tropical cyclones are violent storms that originate over warm ocean waters near the equator.
  • Conditions for formation of tropical cyclone:
    • Large sea surface with temperature higher than 27° C.
    • Presence of the Coriolis force.
    • Small variations in the vertical wind speed.
    • A pre-existing weak low-pressure area or low-level-cyclonic circulation.
    • Upper divergence above the sea level system.
  • Cyclones are named by the regional specialised meteorological centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs).
    • There are six RSMCs in the world, including IMD, and five TCWCs.
  • As an RSMC, IMD names the cyclones developing over north Indian Ocean, including Bay of Bengal and Arabian Sea.
  • IMD is also mandated to issue advisories to 12 other countries in the region on the development of cyclones and storms
  • In 2000, a group of nations called WMO/ESCAP (World Meteorological Organisation/United Nations Economic and Social Commission for Asia and the Pacific), which comprised Bangladesh, India, the Maldives, Myanmar, Oman, Pakistan, Sri Lanka and Thailand, decided to start naming cyclones in the region. After each country sent in suggestions, the WMO/ESCAP Panel on Tropical Cyclones (PTC) finalised the list.
  • Name is taken from this list which contains suggestions categorised alphabetically and country-wise and are neutral gender wise.
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