The IO/E Hem interference has not been nearly as prevalent with the current NINO (relatively speaking), which is likely related to the -AMO being able to isolate the anomalous NINO circulation in the Pacific as opposed to most post 1991-92 NINOs bleeding into the western hemisphere/Africa. I seriously doubt it's just mere coincidence that this abrupt change in NINO upper level configuration coincided with the AMO flip ~1995... It's been a while since we've seen a classic look like this. http://weatheradvance.com/home/weather/weatheradvance.com/wp-content/uploads/2015/10/compday.C6aQJbka5x.gif BTW, Kaplan's Extended SSTv2 dataset just updated several hours ago. As expected, (since it's just a lower resolution version of OISSTv2 after 1981), the latest ONI value is precisely in line with OISSTv2, now up to +1.90 C, and JAS was ranked 2nd overall since 1870 behind 1877-78. If the current rate of intensification that we've observed over the past few months holds thru October, we're going to set a new record in this dataset. To be frank, the more datasets I compile together, the more I find it sad how many in the field nor the public don't realize that NOAA's ERSST products are grossly underestimating the intensity of this El Nino. There's a massive difference between an ONI value under +1.5C & +1.90C, the former is no doubt impressive, but the latter is historic & practically unprecedented in the last few centuries... http://weatheradvance.com/home/weather/weatheradvance.com/wp-content/uploads/2015/10/Kaplan-Extended-SSTv2-1990-JAS-2015-889x1024.png