Climatology Indicators: PDO, ENSO, etc

Warm Phase Cool Phase

Pacific Decadal Oscillation. We are likely moving into the cool phase of this oscillation, when sea surface temperatures along the West Coast are, on average, a bit cooler than normal.
PDO: http://cses.washington.edu/cig/pnwc/aboutpdo.shtml

For watching changes in ENSO, MJO, blocking, and teleconnections like the AO and NAO:
http://www.cpc.ncep.noaa.gov/products/precip/CWlink/MJO/climwx.shtml

Patterns in 500mb height
http://www.cpc.ncep.noaa.gov/products/intraseasonal/z500_nh_anim.shtml