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  • Topic: Tornado, Waterspout, Cumulonimbus cloud
  • Pages : 2 (498 words )
  • Download(s) : 98
  • Published : May 20, 2013
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TORNADO
Each year, about a thousand tornados touch down in the United States, far more than other countries5-. Nebraska, South Dakota, Oklahoma, Texas and Kansas make up tornado alley. Where tornadoes strike regularly in the spring and early summer. Usually a tornado starts of as a white or gray cloud but if it stays around for a while, the dirty and debris is sucked up eventually it turns into a black one. In 1931 a tornado in Mississippi lifted an 83 ton train and tossed it 80n feet from the track. The united states have an average of 800 tornadoes every year. Various types of tornadoes include the land spout , multiple vortex tornado, and waterspout. Waterspouts are characterized by a spiraling funnel-shaped wind current, connecting to a large cumulus or cumulonimbus cloud. They are generally classified as non-super cellular tornadoes that develop over bodies of water, but there is disagreement over whether to classify them as true tornadoes. These spiraling columns of air frequently develop in tropical areas close to the equator, and are less common at high latitudes. Other tornado-like phenomena that exist in nature include the gustnado, dust devil, fire whirls, and steam devil. There are several scales for rating the strength of tornadoes. The Fujita scale rates tornadoes by damage caused and have been replaced in some countries by the updated Enhanced Fujita Scale. An F0 or EF0 tornado, the weakest category, damages trees, but not substantial structures. An F5 or EF5 tornado, the strongest category, rips buildings off their foundations and can deform large skyscrapers. The similar TORRO scale ranges from a T0 for extremely weak tornadoes to T11 for the most powerful known tornadoes. Doppler radar data, photogrammetry, and ground swirl patterns may also be analyzed to determine intensity and assign a rating. A tornado is "a violently rotating column of air, in contact with the ground, either pendant from a cumuliform cloud or underneath a cumuliform...
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