The Bay of Bengal is a known breeding ground of tropical cyclone and hit the coastal area of Bangladesh during pre-monsoon (April and May) and post-monsoon (October and November). One of the reasons why it hits Bangladesh coast often is the conical shape of the Bay of Bengal. Over the last 50 years, 15 severe cyclones with wind speed ranging from 140 to 225 km/hr have hit the coastal area of Bangladesh of which 7 hit in pre-monsoon and rest in the post-monsoon season.