May 2016 ENSO Update – The 2015/16 El Niño Has Reached Its End

Watts Up With That?

Guest Post by Bob Tisdale

This post provides an update of many of the ENSO-related variables we presented as part of the 2014-15 El Niño Series and for the 2015/16 El Niño series.

INTRODUCTION

In the recent post Say Good-Bye to the 2015/16 El Niño, we illustrated and discussed how the weekly sea surface temperature anomalies of the NINO3.4 region of the equatorial Pacific had dropped below NOAA’s +0.5 deg C threshold for El Niño conditions for the week centered on May 18thWeekly sea surface temperature anomalies for that region are now below zero.

We noted in the April update that both Australia’s Bureau of Meteorology (BOM) and the U.S.’s NOAA have issued La Niña alerts for the ENSO season of 2016/17. (BOM notice is here, and NOAA advisory is here.) Sea surface temperature anomalies for the equatorial Pacific are rapidly moving…

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