The first few datasets available for ONI calculations have started to trickle in for JAS, and the numbers are impressive, even in ERSSTv4 & ERSSTv3b, which have been low outliers, horrendously underestimated the intensity of this NINO thus far ,& are closer to the un-interpolated/unadjusted IOCADSv2.5 dataset, which isn't surprising given their (piss-poor) methodologies for handling satellite data input. NCEP R1 is likely a bit closer to reality & what will likely be reported in short order by OISSTv2, Kaplan Extended SSTv2, & COBE SST (as well as HADISST next month) with values approaching +1.9C. Thus, based on NCEP R1 & how well it has correlated to these aforementioned datasets, it appears likely that we'll reach +2.0C in ASO. This threshold has been surpassed only twice this early in the evolution of an El Nino event since the mid 19th century, of course during the 2 strongest events in the entire observational record... (1877-78 & 1997-98). The BOM SOI index was 5th lowest on record in September, only beaten out by 1982, 1940, 1902, & 1896, all of which were embedded within strong El Ninos. The MEI should be updated by tomorrow (Oct 5). http://www.bom.gov.au/climate/current/soihtm1.shtml ERSSTv4 ONI (1990-Present). The latest value (+1.46) was the 6th highest on record in JAS in this dataset, superseded by 1987, 1905, 1902, 1997, & 1877. Again in reality, this estimate is likely far too conservative & using the entire record, this El Nino should be ranked comfortably in 2nd behind 1877. Kaplan's Extended SST v2 (LDEO) data will confirm this in several days... http://weatheradvance.com/home/weather/weatheradvance.com/wp-content/uploads/2015/10/ERSSTv4-ONI-1990-JAS-2015-893x1024.png ERSSTv3b ONI (1990-Present) http://weatheradvance.com/home/weather/weatheradvance.com/wp-content/uploads/2015/10/ERSSTv3b-ONI-1990-JAS-2015-888x1024.png NCEP R1 ONI (1990-Present) http://weatheradvance.com/home/weather/weatheradvance.com/wp-content/uploads/2015/10/NCEP-R1-ONI-1990-JAS-2015-890x1024.png