Let's start by clarifying terms. Cyclone is a general term
for a tropical storm that develops over an ocean. A hurricane is a very strong cyclone
(wind speeds of over 74 miles per hour) that develops over the Atlantic Ocean, usually
starting west of northern Africa and moving across the Atlantic toward Central America
and the southeastern United States. A typhoon is a hurricane that forms over the Pacific
Ocean.
Weather events, including cyclones, are caused by
the movement and interaction of large masses of air called fronts. When a cold front
moving from west to east meets a warm front moving from east to west, the air may be
blown in a counter-clockwise circular formation. If the force of the weather systems
causes this spiral of wind to build enough speed, it may become a cyclone or other type
of storm, depending on its location.
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