Bulletin of the American Meteorological Society
Published date October 30, 2014
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.