22nd October 2024 (12 Topics)

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Dana, Severe Cyclonic Storm

Context

The India Meteorological Department (IMD) has announced the development of a low-pressure system over the East-central Bay of Bengal, which is expected to intensify into a severe cyclonic storm, named "Dana".

The Naming of Cyclones

The process of naming cyclones in the North Indian Ocean follows a structured convention initiated by the WMO/ESCAP Panel on Tropical Cyclones.
Countries Involved
- Original Group: In 2000, a group comprising Bangladesh, India, the Maldives, Myanmar, Oman, Pakistan, Sri Lanka, and Thailand began naming cyclones.
- Expansion: In 2018, the panel expanded to include Iran, Qatar, Saudi Arabia, the UAE, and Yemen.
- Total Names: The IMD has a list of 169 cyclone names, with 13 suggestions from each of the 13 member countries.
Naming Conventions: Countries must adhere to specific guidelines when proposing names:
- Neutrality: Names should not reference political figures, religions, or cultures.
- Sensitivity: Names must not offend any global population group.
- Length: Names should be short, easy to pronounce, and contain no more than eight letters.
- Originality: A name cannot be repeated until all others on the list have been used.
- Pronunciation: Each proposed name must include its pronunciation.
Naming cyclones serves several important purposes:
- Memorability: Names are easier to remember than numbers or technical terms.
- Awareness: Named storms facilitate public awareness and media reporting.
- Preparedness: They enhance community preparedness by enabling rapid dissemination of warnings, especially during multiple cyclonic events.

Fact Box: What are Cyclones?

A cyclone is a large-scale system of air that rotates around the centre of a low-pressure area.
The cyclone forms around the low-pressure area, called a depression, along a zone of cold and warm air exchange called the ‘eye wall’. The eye is the central and calmest part of the cyclone.
From this eye wall, long, arching cloud and rain systems called rainbands spiral outwards, which bring alternating periods of intense rain and calm spells during a cyclone.
The air circulates inward in an:
- anticlockwise direction in the Northern hemisphere
- clockwise in the Southern hemisphere
Cyclones are classified as:
- Extra tropical cyclones (also called temperate cyclones): They occur outside of the tropic. They have “cold air at their core, and derive their energy from the release of potential energy when cold and warm air masses interact”
- Tropical cyclones: Tropical cyclones are those which develop in the regions between the Tropics of Capricorn and Cancer
India is exposed to nearly 10 per cent of the world’s tropical cyclones. More cyclones occur in the Bay of Bengal than the Arabian Sea and the ratio is approximately 4:1.
Worldwide terminology: Cyclones are given many names in different regions of the world – They are known as:
- Typhoons in the China Sea and Pacific Ocean
- Hurricanes in the West Indian islands in the Caribbean Sea and Atlantic Ocean
- Tornados in the Guinea lands of West Africa and southern USA
- Willy-willies in north-western Australia
- Tropical cyclones in the Indian Ocean

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GS Analyst: Daily Current Affairs

22nd October 2024 (12 Topics)

Copy

Dana, Severe Cyclonic Storm

The Naming of Cyclones

Fact Box: What are Cyclones?

Still Have Questions?

GS Analyst: Daily Current Affairs

Dana, Severe Cyclonic Storm

The Naming of Cyclones

Fact Box: What are Cyclones?

Still Have Questions?

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