Meteorologists at the Center for Analysis and Prediction of Storms at the University of Oklahoma predicted the evolution of these storms by incorporating data from several sources including Doppler radar into their storm prediction model. The data from their forecasts were used by NCSA's David Bock to generate the image seen on the cover. Ice, snow, and cloud moisture variables are combined and rendered as volumetric clouds with values increasing from deep purple to blue to pink to white.
Rain is represented by the teal isosurface.
Last updated Apr. 1, 1999. All rights reserved.