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Richard Grotjahn

At least six waterspouts occurred at a large alpine lake in the western United States over several hours during 26 September 1998. Photographs showing the conditions as well as representative examples of this extremely rare event are presented. Some mechanisms are discussed that may explain the persistence of the convection and the low-level vorticity that gave rise to the waterspouts.

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Richard Grotjahn and Robert M. Chervin

For the past two years, the authors have been involved in the production of computer-animated movies at the National Center for Atmospheric Research (NCAR). The computer- generated frames are high-quality graphs of two- and three-dimensional variables featuring trajectories, contour lines, shading patterns, or three-dimensional surfaces (viewed in perspective). The original application was for comparing the FGGE dataset motion fields with satellite film loops. Applications have broadened to include model-generated data. Computer animation is particularly useful for efficiently previewing and presenting large quantities of data. Experiments with stereo images have also been made.

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Gabriele Messori, Rodrigo Caballero, Freddy Bouchet, Davide Faranda, Richard Grotjahn, Nili Harnik, Steve Jewson, Joaquim G. Pinto, Gwendal Rivière, Tim Woollings, and Pascal Yiou
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