The authors thank two reviewers for their useful comments on the manuscript. The suggestions from Michio Yanai and C.-P. Chang are especially appreciated. Special thanks are extended to Y.-M. Li for his help in figure preparation. This work was supported by the National Science Council under Grant NSC 96-2111-M-034-002 and the Central Weather Bureau under Grant MOTC-CWB-95-6M-04.
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