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The Science of Tornado
  " tornado
Formation of a tornado mesocyclone
 a small-diameter column of violently rotating air developed within a
 convective cloud and in contact with the ground. Tornadoes occur
 most often in association with thunderstorms during the spring and


 

summer in the mid-latitudes of both the Northern and Southern
 Hemispheres. These whirling atmospheric vortices can generate the
 strongest winds known on Earth: wind speeds in the range of 500 km
 (300 miles) per hour have been estimated. When winds of this
 magnitude strike a populated area, they can cause fantastic
 destruction and great loss of life, mainly through injuries from flying
 debris and collapsing structures. Most tornadoes, however, are
 comparatively weak events that occur in sparsely populated areas and
 cause minor damage."
 

                                                      http://www.britannica.com/eb/alpha?search=tornado
 

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