The authors would like to thank Drs. Tim Dunkerton, Steve Eckermann, Dave Fritts, James Holton, and Kaoru Sato for their comments on the manuscript. This work was supported by grants from the National Science Foundation Physical Meteorology and Large-Scale Dynamic Meteorology Programs ATM-9907501, and POWRE Program 9870502. Robert A. Vincent thanks the Australian Research Council.
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