It was the worst natural disaster Catastrophe to affect Influence Bangladesh since Cyclone Sidr in November 2007 .

The fourth named storm Catastrophe of the 2007 North Indian Ocean cyclone season , Sidr formed Coming_to_be in the central Bay of Bengal , and quickly strengthened Cause_change_of_strength to reach Achieve peak 1-minute sustained winds of 260 km/h ( 160 mph ) , making it a Category-5 equivalent tropical cyclone on the Saffir-Simpson Scale .