Wind is air moving from a place that has higher pressure to one that has lower pressure. Sometimes wind is just a light breeze and other times it is strong enough to blow the roofs off buildings.

This "kite science" site offers information on wind and the atmospheric conditions that cause it. From "Principles of Aeronautics."

Imagine our weather if Earth were completely motionless, had a flat dry landscape and an un-tilted axis. This, of course, is not the case; if it were, the weather would be much different. The local weather that impacts our daily lives...

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.

The concept of jet streams is explained on this site. Read about why jet stream winds blow from west to east, what the polar jet and subtropical jet are, the role that the rotation of the Earth plays, etc.