Follow el Niño with SLA: Sea level anomaly averaged over a region (3-13N, 125E-145E) north of New Guinea (SLA NNG), and sea surface temperature anomaly in the equatorial mid-Pacific NINO3.4. Positive NINO3.4 and negative SLA NNG indicate el Niño events while negative NINO3.4 and positive SLA NNG indicate la Niña events. SLA NNG was extremely low early in 2015 and remained low throughout the year marking a significant el Niño event globally.