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Tornados

2013-11-13 来源: 类别: 更多范文

Tornados Tornados The first step to a tornado is a thunderstorm. The storm starts when warm , humid air rises out of the ground. When they cool in the upper atmosphere it makes clouds. The water droplets start to fall, making a down draft which meets with the updraft. That keep on giving humid air to the thunder cloud. The most violent time in the storm is now. The Tornado forms in the middle of the downdraft and the updraft. The updraft sucks away the air from the ground."Air rushes in to take it's place. The water drops push into the downdraft". That's what forms the funnel-shaped cloud. when the funnel picks up dirt it makes the funnel darker. A tornado is a violent windstorm usually characterized by a twisting, funnel shaped cloud that is caused by a thunderstorm or a hurricane. It is produced when a cool air mass meets a warm air mass and forces the warm air mass to rise over the cool air mass very rapidly. Most of the damage from a tornado is a result of high wind velocity and wind blown debris. Most tornadoes occur during the months of March through August, but they can occur tornado, air, tornados, wind, funnel, tornadoes, vortices, stage, should, area, winds, occur, damage, warm, storm, over, one, high, cloud, time, thunderstorm, suction, speeds, first, within, violent, updraft, take, states, severe, rotate, often, mph, mass, know
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