PBS
Pbs/global Weather Machine
This site explains wind systems as part of a global weather scheme, with illustrations.
Other
Kites as Education: Wind Origins
This "kite science" site offers information on wind and the atmospheric conditions that cause it. From "Principles of Aeronautics."
NOAA
Noaa: Southern Region Weather: Global Circulations
"Global Circulations explain how air and storm systems travel over the Earth's surface. The global circulation would be simple (and the weather boring) if the Earth did not rotate, the rotation was not tilted relative to the sun, and had...
PBS
Pbs Learning Media: Global Weather Machine
In this illustrated essay from NOVA Online, explore the cyclical process of weather creation and the effects of El Nino on the global weather system.
Other
Stormfax: El Nino Glossary
This site offers definitions for terms related to El Nino, including information on southern oscillation and its relationship to the trade winds.