We gratefully acknowledge the provision of the rawinsonde dataset by Dave Whiteman and Xindi Bian of Pacific Northwest National Laboratories, which made this study possible. The hourly profiler data were obtained from archives at the National Center for Atmospheric Research, which is sponsored by the National Science Foundation. We also are grateful for correspondence with Patricia Miller of NOAA/ERL and Barry Lesht of Argonne National Laboratories. This study was supported by National Science Foundation Grant ATM-9616728. This is Journal Paper J-18307 of the Iowa Agricultural and Home Economics Experiment Station Project 3245, supported by Hatch Act and State of Iowa funds.
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