Jupiter's Great Red Spot. The Great Red Spot is a great anti-cyclonic (high pressure) storm akin to a hurricane on Earth, but it is enormous (three Earths would fit within its boundaries) and it has persisted for at least the 400 years that humans have observed it through telescopes. Since it is anti-cyclonic in Jupiter's Southern hemisphere, the rotation is counterclockwise, with a period of about 6 days. (A hurricane in Earth's Southern hemisphere rotates clockwise.)
The Great Red Spot of Jupiter, as seen from the Voyager 1 spacecraft, a gigantic hurricane-like storm system that has been raging for over 300-years, and perhaps much longer. Three Earths could fit inside it.