The numerical model simulation of thunderstorms in three spatial dimensions and time is leading to im proved understanding of severe storm structure and evolution. The results from one of these simulations is presented using a variety of display techniques to illus trate the water and ice structure of a severe storm, how air moves and rotates in and around the storm, and how different physical processes influence storm rotation near the ground. The visualization of the data was a team ef fort, and the accompanying video illustrates the value of animation in studying complex fluid flow problems and the kind of visualization tools that will be readily avail able to most researchers in the near future.
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