Limon radar data were provided by Ray McAnelly. Brenda Thompson helped with the editing and Judy Sorbie-Dunn drafted some of the figures. The authors appreciate the suggestions made by the reviewers, and acknowledge the helpful comments of Drs. Michael Montgomery and Richard Johnson of Colorado State University. Financial support for this research was provided by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), Brazil, and by the National Science Foundation under Grant ATM-9420045.
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