Context
As per the India Meteorological Department (IMD) Cyclone Asna has formed over the Kutch coast in Gujarat and adjoining areas of Pakistan.
About
- This is the first cyclonic storm in the Arabian Sea in August since 1976.
- The name Asna, which means “the one to be acknowledged or praised”, has been given by Pakistan.
- Between 1891 and 2023, only three cyclonic storms formed within the Arabian Sea in August (in 1976, 1964, and 1944).
What are Cyclones?
- The phrase Cyclone is derived from the Greek word Cyclos meaning the coils of a snake. It was coined by Henry Peddington since the tropical storms in the Bay of Bengal and the Arabian Sea look like coiled serpents of the sea.
- Cyclones are as a result of atmospheric disturbances around a low-pressure area prominent by swift and often destructive air circulation. The air circulates inward in an anticlockwise direction within the Northern hemisphere and clockwise within the Southern hemisphere.
Cyclone
- Worldwide terminology: Cyclones are given many names in specific regions of the world:
- They are referred to as typhoons within the China Sea and Pacific Ocean; storms 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 and tropical cyclones in the Indian Ocean.
How a Cyclone is formed?
- Conditions: Cyclones usually form over heat ocean waters, the warmth presents the vital warmness and moisture to fuel the cyclone.
- Warm water causes the sea to evaporate, creating warm, moist air. This moist air rises from the ocean floor, leading to a lower in air strain at the floor.
- Formation of a Low-Pressure System: When the air rises up and faraway from the sea surface, it creates an area of decrease air pressure beneath.
- It causes the air from surrounding regions with higher stress to transport closer to the low-pressure region which similarly leads to warming up of the air and causes it to rise above.
- Cyclonic Circulation: The rotation of the Earth (Coriolis impact) causes the growing air to start spinning around the low-stress center. This spinning motion ends in the development of cyclonic circulation.
Cyclonic Circulation
- As the wind gadget rotates with increasing velocity, a watch is formed in the center.
- The centre of a cyclone may be very calm and clear with very low air strain. The difference of temperature between the warm, rising and the cooler environment causes the air to rise and come to be buoyant.
- Dissipation: A cyclone will sooner or later weaken and dissipate when it moves over cooler waters, encounters dry air, or interacts with land, which disrupts the gadget’s supply of heat, wet air.
Nomenclature
- The names are maintained and up to date by an international committee of the World Meteorological Organization.
- Cyclones within the North Indian Ocean location are named by the local specialised meteorological centers (RSMCs) in India, Bangladesh, Myanmar, Oman, Pakistan, and Sri Lanka.
- Each country contributes names to a list used on a rotating basis.
- The primary cause for naming cyclones is to make communication less complicated and more efficient.
- Names assist in distinguishing between more than one storm occurring at the same time and make warnings more understandable for the general public.
Source: The Hindu