This work began as a portion of the first author’s Ph.D. dissertation research in atmospheric science at Colorado State University (CSU). Richard Johnson, the first author’s adviser at CSU, is thanked for his constructive comments and encouragement of this research. Comments on the manuscript from two anonymous reviewers and those from earlier internal reviews by Scott Braun (NCAR) and Christopher Davis (NCAR) improved the presentation of this work. Portions of this research were supported by the National Science Foundation (Grant 9215507).
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