While we wait for NOAA to update their ENSO meter on the WUWT sidebar, Bob Tisdale is way ahead of them. Visually, the La Niña seems rather obvious in the image below:

More is available at the WUWT ENSO page

Weekly ENSO Index Drops Below The La Niña Threshold

by Bob Tisdale

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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