We acknowledge helpful discussions with Jeff Anderson, Howard Bluestein, Alain Caya, Andrew Crook, David Dowell, John Nielsen- Gammon, Bill Skamarock, Lou Wicker, Qin Xu, and Ming Xue. We also benefited greatly from two anonymous reviewers' comments on earlier versions of the manuscript. This research was supported by NSF Grants 0205599 and 0205655 and the U.S. Weather Research Program.
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