Weekly ENSO Index Drops Below The La Niña Threshold

This post will serve as the Mid-August 2011 SST Anomaly Update

NINO3.4

NINO3.4 SST anomalies (a commonly used El Niño-Southern Oscillation Index) have dropped significantly below the -0.5 deg C threshold of a La Niña Event. They are presently at approximately -0.74 deg C.

NINO3.4 SST Anomalies

GLOBAL

Weekly Global SST anomalies rose since the last mid-month update, but made a minor dip last week. Global SST anomalies usually lag NINO3.4 SST anomalies by a few months so the global SST anomalies should be nearing their seasonal peak for this year, before they start to respond to the depressed NINO3.4 SST anomalies. For the week centered on August 17, 2011, Global SST anomalies are +0.169 deg C. I’ve also included a shorter-term graph so that the most recent wiggles are visible.

Global SST Anomalies

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Global SST Anomalies – Short Term

SOURCE

Reynolds OI.v2 SST anomaly data is available through the NOAA NOMADS system:

http://nomad3.ncep.noaa.gov/cgi-bin/pdisp_sst.sh?lite

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About Bob Tisdale

Research interest: the long-term aftereffects of El Niño and La Nina events on global sea surface temperature and ocean heat content. Author of the ebook Who Turned on the Heat? and regular contributor at WattsUpWithThat.
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2 Responses to Weekly ENSO Index Drops Below The La Niña Threshold

  1. Pingback: >LINKS TO SST ANOMALY UPDATES | Bob Tisdale – Climate Observations

  2. Pingback: Preparing for cyclone season… | pindanpost

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