Hurricane simulation. This screenshot is from the award-winning simulation 'Towers in the Tempest', produced by NASA's Scientific Visualization Studio in 2007. Here, the eye of the hurricane (L, centre) is surrounded by cloud walls extending outwards for 250 kilometres (green circles of 50 kilometres) and upwards for 15 kilometres (vertical green line, marked in steps of 5 kilometres). The entire simulation shows the formation of a phenomenon known as a 'hot tower' that conveys energy rapidly to higher levels within the hurricane, intensifying its strength. The simulation was based on observations of Hurricane Bonnie using the Tropical Rainfall Measuring Mission (TRRM) spacecraft.