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What are Hurricanes? 

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What Makes Hurricanes Form?

Scientists don't know exactly why or how a hurricane forms. But they do know that two main ingredients are needed.
One ingredient is warm water. Warm ocean waters provide the energy a storm needs to become a hurricane. Usually, the surface water temperature must be 26 degrees Celsius (79 degrees Fahrenheit) or higher for a hurricane to form.

The other ingredient is winds that don't change much in speed or direction as they go up in the sky. Winds that change a lot with height can rip storms apart. ( Source: NASA.gov )

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What Are the Parts of a Hurricane?
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• Eye             : The eye is the "hole" at the center of the storm. Winds are light in this area. Skies are partly cloudy, and sometimes even clear.
• Eye wall     : The eye wall is a ring of thunderstorms. These storms swirl around the eye. The wall is where winds are strongest and rain is heaviest.
• Rain bands: Bands of clouds and rain go far out from a hurricane's eye wall. These bands stretch for hundreds of miles. They contain thunderstorms and sometimes tornadoes.

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