La Niña on Dec. 26, 2010 (IMAGE) NASA/Goddard Space Flight Center Caption The La Niña is evident by the large pool cooler than normal (blue and purple) water stretching from the eastern to the central Pacific Ocean, reflecting lower than normal sea surface heights. "This La Niña has strengthened for the past seven months, and is one of the most intense events of the past half century," said Climatologist Bill Patzert of NASA JPL. Credit NASA JPL/Bill Patzert 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.