NOAA Has Resurrected the 2014/15 El Niño with Its Recent Changes to the Oceanic NINO Index

Bob Tisdale - Climate Observations

Just in case you missed the mention of this in the text of the most recent sea surface temperature update

In a June 2015 post, we discussed and illustrated how Weak El Niños and La Niñas Come and Go from NOAA’s Oceanic NINO Index (ONI) with Each SST Dataset Revision.  NOAA has once again revised their Oceanic NINO Index. Now they’re using the base years of 1986-2015 for the NINO3.4 sea surface temperature data starting in 2001, instead of 1981-2010.  See the NOAA webpage here for the basis of using shifting base years for their Oceanic NINO Index.  Based on the date of that webpage it appears the recent changes took place in June 2016.

The recent changes have shifted the start and end months of some the “official” NOAA El Nino and La Niña events.  But the most noticeable change is the resurrection of the 2014/15 El Niño. See…

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