The author would like to thank Dr. David Kristovich at the Illinois State Water Survey and Dr. Mark Hjelmfelt at South Dakota School of Mines and Technology for reviewing and making beneficial comments on this manuscript. In addition, the author thanks the two anonymous reviewers of this manuscript for their helpful comments. The author gratefully acknowledges the Department of Atmospheric Sciences, University of Illinois, for providing the surface and 850-hPa analyses used for Figs. 2 and 3. This work was sponsored by the National Science Foundation under Grant ATM 95-10098 and the NWS Office of Meteorology and the Great Lakes Environmental Research Laboratory Cooperative Institute of Limnology and Ecosystems Research under Cooperative Agreement COM DK 0870.
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