Tornadoes form from large thunderstorms called
super cells. Meteorologists are not quite
sure what causes some storms to produce tornadoes
while others do not. What is known is that
there is circulation inside of a
thunderstorm. Warm air rises up and cools
with altitude until it becomes unstable and
descends again. This rotation
generally happens parallel to the ground and
produces nothing more than rain, hail, and
If the storm twists and the rotation
becomes perpendicular to the ground, a tornado can
form. Officially, to be labeled a tornado
the rotating column must be in contact with the
ground and the storm cloud.
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