1. Shukla, S., Safeeq, M., AghaKouchak, A., Guan, K. & Funk, C. Geophys. Res. Lett. 42, 4384–4393 (2015).
2. Howitt, R. E., Medellin-Azuara, J., MacEwan, D., Lund, J. R. & Sumner, D. A. Economic Analysis of the 2014 Drought for California Agriculture (University of California, Davis, 2014).
3. Adams, H. D. et al. Proc. Natl Acad. Sci. USA 106, 7063–7066 (2009).
4. Herring, S. C., Hoerling, M. P., Peterson, T. C. & Stott, P. A. (eds) Bull. Am. Meteor. Soc. 95, S1–S96 (2014).
5. Lund, J. R. & Medellin-Azuara, J. in Proc. World Environmental and Water Resources Congr. 2073–2080 (American Society of Civil Engineers, 2015).