NINO3.4 Sea Surface Temperature (SST) anomalies (a commonly used El Niño-Southern Oscillation Index) are still varying back and forth across the threshold of a moderate La Niña. This past week they dropped below again. For the week centered on January 18, 2012, NINO3.4 SST anomalies are approximately -1.13 deg C.
NINO3.4 SST Anomalies – Short-Term
Weekly Global SST anomalies appear as though they may have bottomed out for the season. We’ll be able to tell for sure over the next few weeks.
Global SST Anomalies – Short-Term
THE WIGGLE OBSERVERS HAVEN’T COMMENTED ABOUT THIS YET
The 2010/11 La Niña was a moderate event, while the La Niña this year will be classified as a weak one. Note, however, that the Global sea surface temperature anomalies have dropped lower in response to this La Niña than the last one. That’s a curiosity.
This weekly Reynolds OI.v2 SST dataset begins in 1990. I’ve started the graphs in 2004 to make the weekly variations visible.
OI.v2 SST anomaly data is available through the NOAA NOMADS system: