And so goes PDO…

The first thing one notices is that this historical index shows the Pacific Oscillation to be far more medicentennial than decadal. This bears some further work for this wonderful index:

 Shen, C., et al. 2006.
Pacific   Decadal Oscillation Reconstruction.
IGBP   PAGES/World Data Center for Paleoclimatology
Data   Contribution Series # 2006-045.
NOAA/NCDC   Paleoclimatology Program, Boulder CO, USA.

goes back to 1470, about when Columbus was learning to walk.

The second thing one notices is that PDO is not a good way to predict rain in San Francisco.

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