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What is the great red spot?

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It's a swirling mass of gas and colored clouds that is bigger than the earth.
It's been around since the telescope was invented; maybe it's much older than that, even.

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People sometimes call it a hurricane but it's probably different from a hurricane in the way it works.

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There's no ocean underneath, and it's much bigger than a hurricane 
and doesn't have any intense eye at the center.

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The red spot is rolling like a ball bearing between two conveyer belts. 

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Just to the north of the red spot, there's a westward moving jet stream, 
and just south of the red spot there's an eastward moving jet stream.

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Somehow the jet streams steady the red spot and keep it trapped at one latitude.

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There's no solid surface with which to measure your wind speed. It speeds up 
and slows down slightly. It's not anchored to anything - it's on its own schedule.