Weak El Niño Observed (IMAGE) NASA/Goddard Space Flight Center Caption Sea surface height anomalies on September 3, 2006, during a weak El Niño event. Yellow and red areas indicate where the waters are relatively higher (warmer) and have expanded above normal sea level; green indicates near normal sea level; blue and purple show where waters are relatively lower (colder) and below normal sea level. Credit NASA/JPL Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.