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1 Dec 2025·Source: The Indian Express
2 min
Environment & EcologyEnvironment & EcologyEXPLAINED

Decoding Cyclone Names: The Global System Behind Ditwah and Others

Tropical cyclones are named by regional bodies under WMO guidelines, following a specific rotational system.

Decoding Cyclone Names: The Global System Behind Ditwah and Others

Photo by Wolfgang Hasselmann

Background Context

Historically, tropical cyclones were identified by their latitude and longitude, which was confusing. The practice of naming storms began to simplify communication between forecasters and the public, making it easier to refer to specific storms and issue warnings. The WMO established a standardized system for naming cyclones globally.

Why It Matters Now

With increasing frequency and intensity of extreme weather events due to climate change, effective disaster communication is paramount. The cyclone naming system plays a critical role in public awareness, evacuation efforts, and international coordination for disaster response in vulnerable coastal regions.

Key Takeaways

  • •Cyclones are named to avoid confusion and enhance communication.
  • •WMO coordinates the naming process globally.
  • •Regional bodies like IMD (for North Indian Ocean) maintain lists of names.
  • •Names are chosen from lists contributed by member countries and are used sequentially.

Related Concepts

Cyclone FormationDisaster Risk Reduction (DRR)Early Warning SystemsClimate Change Impacts
When a tropical cyclone forms, like the recent 'Ditwah', it gets a name, but have you ever wondered how? It's not random! Tropical cyclones are named by Regional Specialized Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs) around the world, following guidelines set by the World Meteorological Organization (WMO). Each region has a designated list of names, contributed by member countries, which are used in rotation. This naming system helps in clear communication, avoids confusion, and raises public awareness about specific storms, which is crucial for disaster preparedness and management.

Key Facts

1.

Tropical cyclones are named by Regional Specialized Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs)

2.

Naming follows guidelines from the World Meteorological Organization (WMO)

3.

Names are contributed by member countries and used in rotation

4.

The system aids in communication and disaster preparedness

UPSC Exam Angles

1.

Role of international organizations like WMO in global disaster management.

2.

India's specific role as an RSMC (IMD-RSMC New Delhi) for the North Indian Ocean basin.

3.

Geographical aspects of tropical cyclone formation, movement, and regional nomenclature.

4.

Policy and administrative aspects of disaster preparedness and early warning systems.

5.

Environmental factors influencing cyclone intensity and frequency (e.g., climate change).

Visual Insights

Global Tropical Cyclone Naming Centres & 'Ditwah' Location

This map illustrates the six Regional Specialized Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs) with naming responsibility across the globe, as coordinated by the WMO. It also marks the approximate location of the recent Cyclone 'Ditwah' in the North Indian Ocean, named by RSMC New Delhi.

Loading interactive map...

📍New Delhi, India📍Tokyo, Japan📍La Réunion, France📍Nadi, Fiji📍Miami, USA📍Honolulu, USA📍Bay of Bengal

The Global Process of Tropical Cyclone Naming

This flowchart outlines the systematic process by which tropical cyclones are named globally, from name submission by member countries to the eventual use and potential retirement of names, ensuring clarity and consistency in communication.

  1. 1.WMO Member Countries Propose Names (e.g., India, Pakistan, Oman for North Indian Ocean)
  2. 2.Regional Specialized Meteorological Centre (RSMC) Compiles & Maintains Regional Name List
  3. 3.WMO/ESCAP Panel on Tropical Cyclones (or similar regional body) Approves List
  4. 4.Tropical Cyclone Forms & Reaches Designated Intensity Threshold (e.g., Cyclonic Storm)
  5. 5.RSMC Assigns the Next Available Name Sequentially from the Approved List
  6. 6.Name Used for Official Warnings, Public Communication, & Media Reporting
  7. 7.Was the Cyclone Exceptionally Destructive or Caused Significant Fatalities?
  8. 8.Name Retired from the List (to avoid confusion & for sensitivity)
  9. 9.List Continues in Rotation (or New Name Replaces Retired One)

Practice Questions (MCQs)

1. With reference to the naming of tropical cyclones, consider the following statements: 1. Tropical cyclones are named by the World Meteorological Organization (WMO) directly, based on a global list. 2. Each region has a designated list of names contributed by member countries, which are used in rotation. 3. The primary purpose of naming cyclones is to facilitate clear communication and raise public awareness for disaster preparedness. Which of the statements given above is/are correct?

  • A.1 and 2 only
  • B.2 and 3 only
  • C.3 only
  • D.1, 2 and 3
Show Answer

Answer: B

Statement 1 is incorrect. Tropical cyclones are named by Regional Specialized Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs) following guidelines set by the WMO, not directly by the WMO from a single global list. Statement 2 is correct, as each region maintains its own list of names contributed by member countries, used in rotation. Statement 3 is correct, as the naming system significantly aids in communication, avoids confusion, and enhances public awareness, which is crucial for disaster management.

2. Consider the following statements regarding tropical cyclones and their characteristics: 1. Tropical cyclones derive their energy from the latent heat released by condensation of water vapor. 2. The Coriolis effect is essential for the formation of tropical cyclones, which is why they do not form near the Equator. 3. The India Meteorological Department (IMD) functions as one of the six Regional Specialized Meteorological Centres (RSMCs) globally, responsible for naming cyclones in the North Indian Ocean basin. How many of the statements given above are correct?

  • A.Only one
  • B.Only two
  • C.All three
  • D.None
Show Answer

Answer: C

Statement 1 is correct. Tropical cyclones are heat engines that draw energy from warm ocean waters and release it through the condensation of water vapor, which fuels their intensification. Statement 2 is correct. The Coriolis effect provides the necessary rotational force for the formation of tropical cyclones. Since the Coriolis effect is weakest at the Equator (0-5 degrees latitude), tropical cyclones rarely form in this region. Statement 3 is correct. The IMD, based in New Delhi, is indeed one of the six RSMCs worldwide and is responsible for issuing advisories and naming tropical cyclones over the North Indian Ocean (including the Arabian Sea and Bay of Bengal).

3. Which of the following statements is NOT correct regarding the World Meteorological Organization (WMO) and its role in disaster management?

  • A.WMO facilitates international cooperation in meteorology and operational hydrology.
  • B.WMO sets international standards and guidelines for meteorological observations and data exchange.
  • C.WMO directly issues warnings and advisories for all tropical cyclones globally.
  • D.WMO supports research and training in meteorology and related fields to improve forecasting capabilities.
Show Answer

Answer: C

Statement C is NOT correct. While WMO sets the guidelines for tropical cyclone naming and warning systems, it does not directly issue warnings and advisories for all tropical cyclones globally. This responsibility falls to the designated Regional Specialized Meteorological Centres (RSMCs) and Tropical Cyclone Warning Centres (TCWCs) in their respective areas of responsibility. Statements A, B, and D accurately describe key functions of the WMO, which include fostering international cooperation, setting standards, and supporting research and training.

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