The “Ridiculously Resilient Ridge,” sometimes shortened to “Triple R” or “RRR,” is the nickname given to a persistent region of atmospheric high pressure that occurred over the far northeastern Pacific Ocean during 2013-2014. This anomalous atmospheric feature disrupted the North Pacific storm track during the winters of 2012-2013, 2013-2014, and 2014-2015, resulting in extremely dry and warm conditions in California and along much of the West Coast.[1] [2] The Ridge comprises the western half of atmospheric ridge-trough sequence associated with the highly amplified “North American dipole” pattern, which brought persistent anomalous cold and precipitation to the eastern half of North America[3] during 2014 in addition to record-breaking warmth and drought conditions in California
https://en.wikipedia.org/wiki/Ridiculously_Resilient_Ridge