How do tornadoes form?

Tornadoes form when two different air masses combine together. Tornadoes mainly happen when there is a thunder storm already happening.  A rotating upward movement is a main feature to starting a tornado.

Large winds,and hailing is apart of them also. A low cloud is the base where you can start to identify the rotation.

        There is a wide range of width, heighth, and speed. The average width is 50 yards wide.The average heighth is approximately 8-16 miles. Now, the average speed is about 65 miles per hour or faster.

  Tornadoes are natural disasters tat happen everywhere.

They only last a couple of minutes or more.

But, in those minutes they do a large amount of damage.

http://www.nssl.noaa.gov/edu/safety/tornadoguide.html