Atmospheric scientists have found that California’s highest temperatures are almost always associated with blocking ridges, regions of high atmospheric pressure than can disrupt wind patterns – including one known as the Ridiculously Resilient Ridge. The Triple R, as it’s called, is also linked with California’s drought.

In new research published online this week in the journal Science Advances, a team of researchers led by Stanford University scientist Noah Diffenbaugh analyzed the occurrence of large-scale atmospheric circulation patterns that occurred during California’s historical precipitation and temperature extremes.