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Meteorology and Weather
Hurricanes Typhoons and Cyclones
Hurricane Katrina

How are hurricanes caused?

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September 29, 2010 8:46PM

There are many factors which are required to cause a hurricane. But the first is a low pressure core which creates a system of showers and thunderstorms. These storms move out over warm ocean water and the moisture feeds and strengthens them. As this group of storms intensifies and organizes, the Coriolis effect starts the air spinning in a counter clockwise direction if it is in the northern hemisphere or clockwise if it is in the southern hemisphere. When the circulation becomes closed the system is called a tropical depression. When sustained winds reach 39 mph the storm is called a tropical storm and is given a name. When sustained winds reach 74 mph the storm is called a hurricane.