Caption: 
The SwRI-led mission to Jupiter imaged white clouds of ammonia, rotating anticlockwise in the gas giant’s cloud tops in July 2018. This Junocam image shows clouds rising as much as 15 km above the others (based on the shadow they cast), especially in the upper central part of the cyclone. These storms are thought to contain water-ammonia hail, “mushballs” specific to Jupiter’s atmosphere, which drag the ammonia down into the deep atmosphere and may explain the presence of shallow lightning flashes.

Credit: 
Courtesy of NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill