The dual-Doppler data are synthesized using the CEDRIC software developed by NCAR. Three anonymous reviewers' comments helped to improve this manuscript substantially. The authors appreciate the discussions with Prof. Tai-Chi Chen Wang. This research is sponsored by the National Science Council of Taiwan under Grants NSC88-2111-M-008-027-A10, NSC89-2111-M-008-012-A10, and NSC89-2111-M-008-062.
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