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.
geosciencebigpicture 
