Representative Image: Cyclone Murasu has formed over the Bay of Bengal days after Cyclone Arnab, putting Andhra Pradesh on alert once again. Days after Cyclone Arnab battered parts of India's eastern coast, another cyclonic storm, Murasu, has formed over the Bay of Bengal, putting Andhra Pradesh on alert once again. The back-to-back weather systems have raised concerns over the region's vulnerability to cyclones during the post-monsoon season. India contributed the name 'Murasu' to the list of cyclone names used over the North Indian Ocean. It means 'drum' in Tamil and refers to a traditional percussion instrument. According to the India Meteorological Department (IMD), Murasu developed from a deep depression over the southwest and adjoining west-central Bay of Bengal on November 1. It is expected to intensify further and move towards the Andhra Pradesh coast. According to the IMD, Murasu is very likely to intensify into a severe cyclonic storm by the morning of November 2. It is then expected to move northwestwards and cross the south Andhra Pradesh coast between Nellore and Narsapur. The landfall is expected between late November 2 and the early hours of November 3, with wind speeds of 100-110 kmph and gusts reaching 120 kmph. The weather department has warned of heavy to very heavy rainfall in parts of coastal Andhra Pradesh. Tamil Nadu, Puducherry and Karaikal are also likely to receive heavy rainfall, while Kerala and Mahe may experience heavy showers. Cyclones generally develop over warm ocean waters when atmospheric conditions support the formation and strengthening of a low-pressure system. The Bay of Bengal is particularly favourable for cyclone formation because its waters remain warm even after the southwest monsoon. Warm sea temperatures provide the moisture and energy needed for storms to develop and intensify. The southwest monsoon also plays an important role. Months of rainfall and river discharge bring large amounts of freshwater into the Bay of Bengal. This creates a relatively less salty layer near the ocean's surface, which helps retain heat. Even when a storm passes over the sea and churns the water, the warm surface layer does not mix as easily with the colder water below. As a result, the ocean retains more heat, allowing a cyclone to draw energy from the water. For a cyclone to develop, it also needs an initial weather disturbance, sufficient moisture in the atmosphere and favourable wind conditions. When these factors come together over warm waters, a low-pressure system can gradually strengthen into a cyclone. Why Are Two cyclones Forming Within Days Of Each Other? The formation of Murasu days after Arnab is linked to the Bay of Bengal's active post-monsoon cyclone season. October to December is one of the two major cyclone seasons over the north Indian Ocean, with November recording the highest frequency of cyclones. During the southwest monsoon, strong differences between winds at lower and higher levels of the atmosphere can prevent developing storm systems from organising into cyclones. These conditions become more favourable after the monsoon withdraws, allowing weather disturbances over warm waters to intensify, a Hindustan Times report noted.