In September 1994 the Hubble telescope – using Wide Field Planetary Camera 2 – imaged storms on Saturn generated by upwelling of warmer air, similar to a terrestrial thunderhead.
The storm was observed earlier in September 1990 and acquired the name Dragon Storm.
The dust storms of Mars vary in size, but can often cover the entire planet. They tend to occur when Mars comes closest to the Sun, and have been shown to increase the global temperature.
One particularly large Martian storm was exhaustively studied up close due to coincidental timing.
Storms do not only occur on Earth; other planetary bodies with a sufficient atmosphere (gas giants in particular) also undergo stormy weather. The Great Red Spot on Jupiter provides a well-known example. Though technically an anticyclone with greater than hurricane wind speeds, it is larger than the Earth and has persisted for at least 340 years, having first been observed by astronomer Galileo Galilei.
The east-west extent of the same-year[clarification needed] storm equalled the diameter of Earth.
Neptune also had its own lesser-known Great Dark Spot.