We thank Bill Kuo and Y.-R. Guo at NCAR/MMM for providing the budget calculation codes, and Drs. Fred Baer and Ming Cai for their helpful discussions. This work was supported by NSF Grant ATM-9802391, NASA Grant NAG-57842, and ONR Grant N00014-96-1-0746. The computations were performed at the National Center for Atmospheric Research, which is sponsored by the National Science Foundation.
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