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El Niño bulletin

Latest plots



Latest monthly mean of Sea Level Anomalies over the Tropical Pacific, annual and seasonal cycles removed Credits CLS/CNES.


The ENSO index is based on the altimeter sea level anomalies over the Nino3.4 region in the Pacific ocean. The annual, seasonal cycles and 60-day signal have been filtered out and the sea level trend has been removed. Monthly time series are computed and normalized.

So note that since January 2020, a new version taking into account the mean sea level trend has been implemented as described here

MSLA are computed from Ssalto/Duacs. More information on MSLA products is given on the product sheet.

Sea Surface Temperature

The ENSO index is also derived from the sea surface temperature over the Nino3.4 region in the Pacific ocean. The annual, seasonal cycles and 60-day signal have been filtered out and monthlynormalized time series are computed.

A map of the latestSea Surface Temperature (annual and seasonal cycles removed ) is also available. Click here to display There were no change in the Sea Surface Temperature computation in January 2020.

*A plot of the time evolution of the Standardized Sea Surface Temperature over the Nino3.4 region (annual and seasonal cycles removed) is also here.

Standardized Sea Level Anomalies over the Nino3.4 region annual and seasonal cycles removed. Credits CLS/CNES.



  • Monthly maps for MSLA and for Dea Surface Temperature fom January 1993 can be seen on the AVISO Ocean Bulletin website
  • Time series of MSLA and Sea Surface Temperature are available for download via FTP.


  • Applications: ENSO
  • Other observations
  • Forecasts :
    • ECMWF
    • CPC/NCEP Climate Prediction Center/National Center for Environmental Prediction
    • IRI International Research Institute for Climate Prediction
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