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Tornado<br />
a violently rotating column of air<br />
that extends from a thunderstorm<br />
to the ground<br />
It's often portended by a dark,<br />
greenish sky. Black storm clouds<br />
gather.<br />
reported in Great Britain, India, Argentina, and<br />
other countries, but most tornadoes occur in<br />
the United States.<br />
Tornados come from thunderstorms<br />
and they can occur whenever and<br />
wherever conditions are right<br />
form when warm, humid air collides with<br />
cold, dry air. When these two air masses meet,<br />
they create instability in the atmosphere.
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