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GS-I : Physical Geography Cyclone

20 October, 2022
6 Min Read

Storm Sitrang in the Bay of Bengal

The first Tropical Cyclone of the 2022 post-monsoon season, Sitrang, is expected to form in the Bay of Bengal on October 24.
Titli was the last October cyclone in the Bay of Bengal in 2018.

About

Storms of severe severity emerge in the North Indian Ocean — comprised of the Bay of Bengal and the Arabian Sea — in the months of October-November and May-June, with an average of five developing per calendar year.
October has seen 61 storms form in the Bay of Bengal over the last 131 years.
In comparison to the Bay of Bengal, the Arabian Sea has only seen 32 storms form in October since 1891.

Important Factors:

Following the exit of the Southwest monsoon, increase in ocean heating, resulting in an increase in sea surface temperature over the Bay of Bengal.
The availability of atmospheric moisture over the ocean region is also greater.
As a result, when leftover systems from the South China Sea approach the Bay of Bengal, they encounter favourable circumstances, facilitating the formation and intensification of cyclones in October."
This phenomenon is hampered in some years due to ocean-atmospheric variables.
For example, weak La Nina conditions in the equatorial Pacific Ocean prevented cyclonic formation near India's shores in 2020.

Cyclone Sitrang

Thailand gave the name Sitrang (pronounced Si-trang), and it is on the list of tropical cyclone names maintained by the Regional Specialised Meteorological Centre (RSMC) from April 2020.

Impacts

In the next four days, the current low pressure system will strengthen and march towards India's east coast.
Gale winds and heavy rain are forecast mostly over the Andaman & Nicobar Islands, Odisha, West Bengal, and Bangladesh, particularly in coastal districts.

About Tropical Cyclone

It is a rapidly rotating storm that forms over tropical oceans and absorbs energy from there to develop.
It has a low-pressure centre and clouds spiralling towards the eyewall, which surrounds the "eye," the central region of the storm where the weather is generally calm and cloud-free.

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