The authors thank Louis Wicker for his helpful comments and Nathan Snook for proofreading. The authors also thank Matthew Kumjian for helpful discussions on the KOUN data quality issue. This work was primarily supported by NSF Grant EEC-0313747. Supplementary support was also provided by NSF Grants AGS-0802888, AGS-0608168, AGS-0750790, OCI-0905040, and NOAA Warn-on-Forecast Grant NA080AR4320904. The computations were performed at the OU Supercomputing Center for Education and Research (OSCER) and OSCER Director Henry Neeman provided valuable technical expertise. Supercomputing resources at the Pittsburgh Supercomputing Center and the National Center for Supercomputing Applications were also used.
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