I’ve moved to WordPress. This post can now be found at March 2009 Mid-Month ENSO Update################
During the week centered on Wednesday March 11, 2009, NINO3.4 SST anomalies have risen above the threshold for a La Nina to -0.41 deg C.
NINO3.4 SST Anomalies
On the other hand, NINO3 SST anomalies have dropped to -0.84 deg C.
NINO3 SST Anomalies
The cool water appears to be working its way westward toward the NINO3.4 region. Refer to the following map…
Central Pacific SST Anomalies (Week Centered on March 11, 2009)
And refer to the animation in the following link:
To add another perspective, the Southern Oscillation Index (SOI) for February 2009 shows no sign of weakening. Note that the SOI data has been inverted so that it corresponds to the variations in NINO SST anomalies.
Inverted Southern Oscillation Index
The map and the SST anomaly data used to create the graphs are available through the NOAA NOMADS system:
Southern Oscillation Index data available from the Australian Bureau of Meteorology webpage: