This is a reconstruction of the EPO using the PSD's definition of the EPO:
Eastern Pacific Oscillation(EPO) [(20-35N, 160W-125W) - (55-65N, 160W-125W)] 500mb Heights, The EP/NP was also missing the Dec Value as seen in the CPC Data, which is a critical pattern for Winter Forecasting. It has been reconstructed using the "NCEP/NCAR Reanalysis monthly means" dataset.
Ascii Data (Standardized, 1981-2010 Climatology) is here @ newepo.txt
The correlation plot (Winter DJF) of 500mb heights for the New EPO (Negative Mode):
The correlation plot (Winter DJF) of surface temperatures for the New EPO (Negative Mode):