October Storm in Bay of Bengal

Context

The first Tropical Cyclone of the post-monsoon season of 2022 is likely to form in the Bay of Bengal on October 24 and will be called Sitrang.

The months of October-November and May-June see storms of severe intensity develop in the North Indian Ocean — comprising the Bay of Bengal and the Arabian Sea — with an average of five developing in a calendar year.
In the past 131 years, October saw 61 storms develop in the Bay of Bengal.
In comparison with the Bay of Bengal, only 32 storms have developed in the Arabian Sea in October since 1891.

After the withdrawal of the Southwest monsoon, there is a rise in ocean heating, which leads to rise insea surface temperature over the Bay of Bengal.
The atmospheric moisture availability over the ocean region, too, is higher.
So, when remnant systems from the South China Sea reach the Bay of Bengal, they get conducive conditions, aiding the formation and intensification of cyclones in October,”
In some years, ocean-atmospheric factors hinder this phenomenon.
For instance, in 2020, weak La Nina conditions along the equatorial Pacific Ocean prevented a cyclonic formation near India’s coasts.

The name Sitrang (read Si-trang) has been given by Thailand, and features in the list of tropical cyclone names prepared by the Regional Specialised Meteorological Centre (RSMC) being followed since April 2020.

The prevailing low pressure system will strengthen and move towards India’s east coast in the coming four days.
Gale winds and enhanced rainfall are expected mainly over Andaman and Nicobar islands, Odisha, West Bengal and Bangladesh, particularly the coastal districts.

It is a rapid rotating storm originating over tropical oceans from where it draws the energy to develop.
It has a low pressure centre and clouds spiralling towards the eyewall surrounding the "eye", the central part of the system where the weather is normally calm and free of clouds.