• Dake Chen's ENSO forecast page
  If (and only if) the link above happens to be down, please check,
  perhaps this Partial mirror of Dake Chen's ENSO forecast page
  at A.Kaplan's home page is still functional, so that necessary files
  with forecast results, e.g., for CDB can be retrieved at
  https://rainbow.ldeo.columbia.edu/~alexeyk/dchen/CDB/, etc.
  In this case please also alert Alexey at the email address:
  alexeyk "at" ldeo "dot" columbia "dot" edu
  

• LDEO5 model input data for the most current forecast
  (issued at the end of the previous month and shown at the link above)
  are described here, including: Ingrid Data Library-like access
  to the input data sets for the LDEO5 forecasts - updated monthly.
  

• Last 12 months of the NINO3.4 index computed from the
  SST observations used for the LDEO5 model input.
  

NOAA's table of ENSO indices is here.

IRI/CPC ENSO prediction plume links:

• IRI/CPC most current ENSO prediction plume:
  http://iri.columbia.edu/our-expertise/climate/forecasts/enso/current/?enso_tab=enso-sst_table

• Barnston et al. (2012) analysis of forecast skill of IRI forecast's component models is here:
  http://journals.ametsoc.org/doi/abs/10.1175/BAMS-D-11-00111.1