The Great Red Spot, the most famous storm on Jupiter, is a massive anticyclonic storm that moves at a speed of around 430 kilometers per hour (270 miles per hour).

However, it's important to note:

* The entire Jovian atmosphere is constantly in motion. There are many other storms and jet streams on Jupiter, all with varying speeds.

* The speed of storms on Jupiter can fluctuate. The Great Red Spot's rotation speed has been measured to change over time.

* Measurements are difficult. Determining precise wind speeds on Jupiter is challenging due to its distance and the nature of its atmosphere.

So, while 430 km/h is a good approximation for the Great Red Spot's speed, it's not a universal figure for all storms on Jupiter.