NOAA
Noaa: The Atmosphere During El Nino
This page explains in detail what happens in the atmosphere during El Nino.
PBS
Pbs: El Nino
You can link to the anatomy of El Nino, chasing El Nino, and El Nino's reach. There is a resource page and a search page.
NASA
Nasa Earth Observatory: El Nino's Extended Family Introduction
This article discusses cycle of global weather patterns and its relation to El Nino. Learn how global weather patterns are being tracked by satellites and how scientists are predicting weather patterns up to a year in advance.