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As we know, both Jupiter and Neptune have great spot like features in South hemisphere, and Saturn has dragon storm in south hemisphere, is it true that great spot like features appear in South hemisphere more frequently? If so, what is the reason?

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  • $\begingroup$ There's no physical reason to expect those storms preferably to appear on either of a planet's hemisphere. However there's the caveat that there is still no sufficient consensus on how to explain the longevity of Jupiter's Great Red Spot. That doesn't mean we can't explain it, it only means there are too many possibilites, and we don't know which one is true. $\endgroup$ – AtmosphericPrisonEscape Jan 8 '16 at 18:52
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Given that we have very few examples, we could not, statistically, draw any significance from any apparent bias. It's also hard to see any theoretical basis for expecting a bias, so my gut feeling would be there probably is no bias.

It's also worth remembering that human observations of these things are essentially a very brief snapshot in a huge period during which we have no idea about what may have been happening. So again the statistical significance of what happens at the moment needs to be carefully considered.

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Saturn's Great White Spot phenomenon often occurs in the Northern hemisphere, so it doesn't look like there is any particular preference.

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