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Answer:   The Great Red Spot
For Teachers:

The Great Red Spot has been compared to a terrestrial hurricane with winds blowing in excess of several hundred miles per hour. Its long life has been attributed to its giant size. Jupiter possesses many smaller whitish ovals that are now also considered to be hurricanes. These smaller hurricanes are often cannibalized by larger hurricanes or meld into each other. It appears as if Jupiterís Great Red Spot is the winning storm, since it has been continuously observed with telescopes for the past 350 years. Saturn, Neptune, and Earth also contain these types of storms. On Neptune, the Great Dark Spot was the most prominent hurricane feature visible when Voyager 2 flew past the planet in 1989. It appears as if Neptuneís and Saturnís spots come and go in a similar fashion to the hurricane activity on Earth. Terrestrial hurricanes are easily visible from space.

Great Red Spot
Jupiter's Red Spot is the biggest hurricane in the Solar System. It rotates in a counterclockwise direction once every six days.

[Close-up of the Great Red Spot]
Here is an even closer view of the Great Red Spot. The Red Spot is spinning counterclockwise as is the smaller, white hurricane below and to the right of the Red Spot. Notice how Jupiter's atmosphere is being squeezed and churned between the two spots. To the right of the white oval in this Voyager photograph is an even smaller hurricane. Only part of it is visible in the photograph.

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