Storms Photography By Mitch Dobrowne

In September 1994 Hubble telescope using Wide Field Planetary Camera 2 imaged the storms on Saturn, generated by upwelling of warmer air, similar to a terrestrial thunderhead. The east-west extent of the same-year storm was equal to the diameter of Earth. The storm was observed earlier in September 1990 and acquired the name Dragon Storm.
The dust storms of Mars are variable in size, but can often cover the entire planet. They tend to occur when Mars is closest to the Sun, and have been shown to increase the global temperature.