NP Index is the area-weighted sea level pressure over the region 30N-65N, 160E-140W.

Time Interval: Monthly
Time Coverage: 1899 to Aug 2012
Update Status: Periodically updated

Get Data:

NP: Standard PSD Format (What is standard format?)
NP: Original

Source:
Data is from NCAR/CGD at http://climatedataguide.ucar.edu/guidance/north-pacific-index-npi-trenberth-and-hurrell-monthly-and-winterl
References:

1. Trenberth and Hurrell (1994), Climate Dynamics 9:303-319

This page hosted by: NOAA ESRL Physical Sciences Division Document maintained by Cathy Smith (cathy.smith@noaa.gov) Updated: Apr 24, 2013 09:02:33 MDT http://www.esrl.noaa.gov/psd/gcos_wgsp/Timeseries/NP/index.html