The authors are grateful to the reviewers for their welcome and constructive suggestions. Primary support for this research was provided by the NASA NEWS program (NNG06GB20G), the NOAA GAPP Program (NA16GP1605), and the NSF STC Program (Agreement EAR-9876800). The first author thanks Drs. Jimmy M. Ferng and Kathleen Bowles, and other staff at the Computer Center and Information Technology, University of Arizona, for their help and support.
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