By Mehraj ZamanA tornado is a rotating column of air. Tornadoes come in many sizes but they are a form of condensation funnel. Most tornadoes have a wind speed between forty miles per hour and hundred and ten miles per hour. They are two hundred feet across and travel several kilometres before dissipating. Some tornadoes have a wind speed more than three hundred and thirty miles per hour and stretch more than a mile across. Tornadoes mostly happen in United States of America.[pic]Tornadoes are formed by a huge rotating thunderstorm witch is call a supercells. Supercells are formed when cold air meets warm air. The result is it is caused by rising warm air. A narrow zone cumulonimbus clouds formed, giving life to tornadoes. After a while there will be flashing lights, heavy rain and hail starts to fall. Soon after the easiest recognizable of tornado, the funnel descends from the base of the cloud. The pressure of the clouds drops due to increasing wind speeds. This is known as Bernoulli’s principle. When the pressure drops it causes moisture in the air condense. This action continues down the spiral, giving the impression that the funnel is descending from the cloud base. There is a hissing sound which turns into a loud roar when the tornado touches the earth.Map of Tornadoes.[pic]A hurricane is a big storm that forms over the ocean. Hurricanes form over warm parts of the Atlantic Ocean, and the Pacific Ocean. They are near the equator in the tropical zone. Due to modern warning systems, the number of deaths from hurricanes is now lowered. It is caused by warm wet mass of air over the sea that begins to evaporate. Water has to be 79 degrees or warmer. It is combined actions of air, water and heat to produce a huge spinning system of clouds rain and wind.How hurricanes are formedHurricanes develop from belts of low pressure called easterly waves. These regions of low pressure occur in ocean winds called trade winds. On certain occasions, the easterly waves form...