We thank T. Stoffel of the National Renewable Energy Laboratory for providing the pyranometer data used for calibrating the visible satellite data. We also thank R. P. d’Entremont, W. J. Lipton, D. C. Norquist, and two anonymous reviewers for suggesting improvements to the manuscript and A. Hobgood and T. Walker for assistance in preparing figures. Surface weather observation data were provided by the USAF Combat Climatology Center. This research was supported by the Air Force Office of Scientific Research under Project 2310 and by the Department of Defense High Performance Computing Shared Resource Center, Army Corps of Engineers Waterways Experiment Station.
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