With the classical El Niño, the tropical eastern Pacific near the South American coast becomes warmer than usual while the western side of the ocean cools.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/could-year%E2%80%99s-el-ni%C3%B1o-be-2009-one
[2] http://admin.indiaenvironmentportal.org.in/category/author/n-gopal-raj
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-tropical-meteorology
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer