Global Geological And Climatic Events

New list of names of tropical cyclones over north Indian Ocean


From UPSC perspective, the following things are important :

Prelims level: Naming of Tropical Cyclones

Mains level: Tropical Cyclones

The India Meteorological Department (IMD) has released a new list containing 169 names of future tropical cyclones that would emerge in the Bay of Bengal and the Arabian Sea.

When is the name of a Tropical Cyclone declared?

  • Names are declared when TCs are diagnosed with maximum sustained surface wind-speed of 34 knots (62 kmph) or more as per Global Data Processing and Forecasting System (GDPFS) Manual of WMO.
  • Panel Members’ names will be listed alphabetically country-wise.

We can expect a statement based prelim question like – Which of the following criterion are followed while naming a tropical cyclone?

Who is involved in the naming of Tropic Cyclone?

  • Worldwide there are six regional specialised meteorological centres (RSMCs) and five regional Tropical Cyclone Warning Centres (TCWCs) mandated for issuing advisories and naming of tropical cyclones.
  • IMD is one of the six RSMCs to provide tropical cyclone and storm surge advisories to 13 member countries under WMO/ESCAP Panel.
  • The panel countries include Bangladesh, India, Iran, Maldives, Myanmar, Oman, Pakistan, Qatar, Saudi Arabia, Sri Lanka, Thailand, United Arab Emirates and Yemen.
  • RSMC, New Delhi is also mandated to name the Tropical Cyclones developing over the North Indian Ocean (NIO) including the Bay of Bengal and the Arabian Sea.

Since when did naming begin?

  • The WMO/ESCAP Panel on Tropical Cyclones (PTC) at its twenty-seventh Session held in 2000 in Muscat, agreed in principle to assign names to the tropical cyclones in the Bay of Bengal and the Arabian Sea.
  • After long deliberations among the member countries, the naming of the tropical cyclones over the north Indian Ocean commenced from September 2004.
  • This list contained names proposed by the eight member countries of WMO/ESCAP PTC, viz., Bangladesh, India, Maldives, Myanmar, Oman, Pakistan, Sri Lanka and Thailand.

Why name Cyclones?

The naming of Tropical Cyclones (TC) helps the scientific community, disaster managers, media and general masses to-

  • identify each individual cyclone.
  • create awareness of its development.
  • remove confusion in case of simultaneous occurrence of TCs over a region
  • remember a TC easily
  • rapidly and effectively disseminate warnings to a much wider audience

Major criteria adopted for naming

  • The proposed name should be neutral to (a) politics and political figures (b) religious believes, (c) cultures and (d) gender
  • The name should be chosen in such a way that it does not hurt the sentiments of any group of the population over the globe
  • It should not be very rude and cruel in nature
  • The maximum length of the name will be eight letters
  • The Panel reserves the right to reject any name if any of the criteria above are not satisfied
  • The names of tropical cyclones over the north Indian Ocean will not be repeated. Once used, it will cease to be used again.


Explained: Naming of cyclones

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