Only 5% of global cyclones brew in Bay, but impact is maximum May 25, 2021 The damage wrought by cyclone Nisarga at Thane, Maharashtra - PTI× Fatalities high due to shallow continental shelf that amplifies storm surges, dense population: RMSI The Bay of Bengal accounts for only 5 per cent of tropical cyclones globally, but cyclones on India’s East Coast result in 80 per cent of the cyclone-induced fatalities worldwide due to the shallow continental shelf that amplifies storm surges, and a very dense population. In India, tropical cyclones usually occur in April-May (pre-monsoon season) and October-November (post-monsoon). In 2020, there were two pre-monsoon cyclones — ‘Amphan’ (a super cyclone) impacting the East Coast and ‘Nisarga’ (severe cyclone) impacting the West Coast.