We thank the staff of the NOAA/NWS California–Nevada River Forecast Center for the river flow data. We also thank H. Walker, J. Duan, and the EROS data center for the digital elevation data. This work was supported by the Laboratory Directed Research and Development and University of California Campus Laboratory Collaboration project. The work of the last two authors was supported by the NOAA Experimental Climate Prediction Center of the Scripps Institution of Oceanography. The Livermore Computing, the San Diego Supercomputing Center, and the Atmospheric Release Advisory Capability provided the computational resources. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.
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