This is just a quick update for those keeping a close eye on the equatorial Pacific.
The weekly sea surface temperature anomalies of the three central and eastern region ENSO indices (NINO3.4, NINO4, NINO1+2) are all dropping, returning to “normal” conditions. The NINO4 sea surface temperature anomalies have been hovering near a +0.5 deg C anomaly for the past few weeks.
Unfortunately, the global data are still climbing–rising close to (but not yet reaching) record high levels. They don’t like these off-season El Niño events. The North Pacific is still warming, and the North Atlantic has just responded to the earlier El Niño conditions in the tropical Pacific, making a big leap in the last week.
The weekly Reynolds OI.v2 sea surface temperature data are available through the NOAA NOMADS website.