This work was supported by NSF Grants ATM-9912097 and -0241037. Some of this work was done while the author was on sabbatical leave at the National Center for Atmospheric Research (NCAR) in the Mesoscale and Microscale Meteorology Division. NCAR is supported by the National Science Foundation. The author is indebted to Peggy LeMone (NCAR) and Prof. Steven Thorpe (United Kingdom) for stimulating discussions and to Greg Thomson (NCAR) and two anonymous reviewers for helpful comments on the manuscript. The author also thanks Mark Laufersweiler (OU) for his computer assistance. Most of the images depicted in this contribution were taken with a Nikon FM2 camera and Kodachrome 25 and Fuji Velvia film; a few were taken with a Fuji A303 digital camera. Color slides were digitized with a Nikon Super Coolscan 9000 scanner.
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