The authors have benefited from discussions concerning this work with Scott Braun (NCAR), David Jorgensen and Bradley Smull (NOAA/NSSL/MRAD), Richard Johnson (Colorado State University), and Louis Wicker (Texas A&M University), and from constructive internal reviews of the manuscript by Chris Davis (NCAR), Richard Rotunno (NCAR), and Richard Carbone (NCAR). Robert Fovell (UCLA) and two anonymous reviewers provided criticisms and suggestions that helped to clarify aspects of this manuscript. This work was sponsored by the National Science Foundation (Grant 9215507).
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