Both cyclones (hurricanes) and tornadoes have
similar origins, they are just different sizes.
For tornadoes, the land becomes hot from the sun
and heats up the air. This makes the hot air rise
and create a circular current leading ultimately
to a tornado. Over the ocean, a cyclone or
hurricane is formed by warm, moist ocean air
rising and forming huge clouds. This results in an
unstable hot/cold balance, and forces the air to
move in the shape you usually see for a cyclone. A
good image of a cyclone forming is here:
click to see
The L and H are areas of low or
high pressure. The movement of the clouds is
caused by air trying to move from high to low
pressure and creating a cycle. It's incredibly
destructive. Some scientists predict that with
warmer oceans due to global warming, this will
lead to more storms and more severe storms,
since it is heat that drives this.
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