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M. Baldi, G. A. Dalu, and R. A. Pielke Sr.

1. Introduction It is well known that mesoscale processes can act to provide adequate moisture and instability for convection to initiate, and surface processes such as those driven by surface heterogeneity or soil moisture gradients can play a fundamental role in the development of convection. Once initiated, the interaction of convection with shear can enhance storm evolution and lead to severe weather ( Chang and Wetzel 1991 ). In this perspective, the surface conditions (dry versus wet soil

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K. W. Oleson, G. B. Bonan, J. Feddema, and M. Vertenstein

explored using the model. Acknowledgments We gratefully acknowledge C. S. B. Grimmond for providing the Mexico City and Vancouver observations and for useful discussions. This research was supported by the Office of Science (BER), U.S. Department of Energy, Cooperative Agreement DE-FC02-97ER62402, the National Science Foundation Grants ATM-0107404 and ATM-0413540, the National Center for Atmospheric Research Water Cycles Across Scales, Biogeosciences, and Weather and Climate Impacts Assessment Science

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