The frequency of devastating local pre-monsoon storms usually reaches its peak in April, while some occur in May and minor ones in March. Wind shear and instability are maximized during this time period as warm, moist air flows northward from the Bay of Bengal and combines with a westerly wind flow in the upper atmosphere. This makes Bangladesh one of the most disaster-prone countries in the world today. I am capable of experiencing possible tornadoes of F4 or even F5 intensity. Unfortunately, Bangladesh is also the country where the deadliest tropical cyclone in history hit. On November 11, 1970, "Cyclone Bhola" killed at least 300,000 people after sending a storm surge 20 to 30 feet high onto the low-lying coast of Bangladesh. this tornado, so I want to focus a little more on this topic. Drought is a major problem for many nations. In Bangladesh the causes of drought are linked to the unavailability of surface water resources and climate variability. The direct cause of a rainfall deficiency may be due to one or more factors including