claim: When the PDO last switched to a cool phase, global temperatures were about 0.4C cooler than currently.
evidence: 1945/1946: The PDO changed to a "cool" phase, the pattern of this regime shift is similar to the 1970s episode with maximum amplitude in the subarctic and subtropical front but with a greater signature near the Japan while the 1970s shift was stronger near the American west coast.
category: Pacific decadal oscillation