El Niño/La Niña Update (July 2007) Document 20 July 2007 A La Niña event could, more likely than not, develop in the second half of 2007. The last WMO El Niño/La Niña Update in March 2007 also noted an enhanced likelihood of La Niña development, and conditions were moving quite rapidly in that direction until a reversal occurred during May and early June. There remains considerable uncertainty over the timing and magnitude of further cooling in the central and eastern Equatorial Pacific, and indeed there is a possibility that basin-wide conditions, despite some cooling, will on balance remain neutral through the remainder of 2007. Development of El Niño during the period is considered very unlikely. Download document Share: Document type: El NIño / La Niña Update