Wednesday, May 20, 2009

Tornado

Tornado is a rotating column of air which is in contact with both the surface of the earth and a cloud.  'Tornada'  in spanish means thunderstrom.  Tornados occur in many sizes and are encompassed by a cloud of dust.  They look like a thin tube between the earth and the cloud.  They are sometimes too violent and are capable of tremendous distruction.

 

They basically form from thunderstroms majorly.  when two air masses of warm, moist air and cold dry air come into contact they cause instability in the atmosphere and gives raise to Tornado.  Tornado have varying wind speeds ranging between 40 mph to 100 mph.  They stretch more than a mile on the ground.  Tornado have occured in all continents except for Antartica.  They commonly occur in south -central America, South Canada, new zealand.

 

Funnel clouds are the initial stages of the tornado.  The rotating column of air before it touches the ground is called the Funnel cloud.  Weaker tornado that occurs over water are called water spouts.



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