Tornado Wind Patterns
http://esminfo.prenhall.com/science/geoanimations/animations/Tornadoes.html

Prentice Hall

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A Flash animation demonstrating how wind patterns lead to the formation of tornados. First, vertical wind shear leads to air spinning parallel to the ground. If an updraft then occurs, a thunderstorm forms and moves the spinning air into a vertical position, potentially creating a full-blown tornado.

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Keywords: tornado, cyclone, twister, formation, cloud, wind, vortex, wind shear, animation, visualization