EEE 2013: The extraordinary California drought of 2013/2014: character, context, and the role of climate change
California’s driest 12-month period on record occurred during 2013/14, and although global warming has very likely increased the probability of certain large-scale atmospheric conditions, implications for extremely low precipitation in California remain uncertain.
Specifically, extreme geopotential height values in this region, which are a defining metric of this type of atmospheric configuration, occur much more frequently in the present climate than in the absence of human emissions.
EEE 2013 = Explaining Extreme Events of 2013 from a Climate Perspective
Jul 3, 2019 | Mashable
The hard truth about being a 21st century tree in California
Mar 4, 2019 | California Weather Blog
The extraordinary California dry spell continues: 2013 will probably be the driest year on record
| Geophysical Research Letters
Temperature impacts on the water year 2014 drought in California
Shraddhanand Shukla, Mohammad Safeeq, Amir AghaKouchak et al
| Proceedings of the National Academy of Sciences
Climate change and California drought in the 21st century
Michael E. Mann, Peter H. Gleick