It’s official: La Niña has developed in tropical Pacific

EL NIÑO/SOUTHERN OSCILLATION (ENSO) DIAGNOSTIC DISCUSSION issued by CLIMATE PREDICTION CENTER/NCEP/NWS and the International Research Institute for Climate and Society 9 November 2017 ENSO Alert System Status: La Niña Advisory Synopsis: La Niña conditions are predicted to continue (~65-75% chance) at least through the Northern Hemisphere winter 2017-18. During October, weak La Niña conditions emerged as reflected by below-average sea surface temperatures (SSTs) across most of the central and eastern equatorial Pacific Ocean (Fig. 1). The weekly Niño indices were variable during the month, with values near -0.5 C during the past week in the Niño- 3.4 and Niño-3 regions…