Why does the Stratosphere warm with altitude?
The Stratosphere is the home of the "Ozone Layer". Ozone is a molecule that reacts with sunlight to produce heat. The amount of ozone in this layer increases with altitude. Therefore the Stratosphere warms up the higher you go.

Ozone is also lighter, meaning it weighs less, that normal air. Because it's lighter it "floats" above the lower atmosphere and acts as a ceiling.

When the air does reach the Tropopause ceiling it spreads out. As it flows along the ceiling it displaces other air. It also cools and sometimes sinks down which starts the cycle all over again. All of this air movement results as wind.

How does all of this relate to wind at ground level?
You have learned 3 important ingredients in this lesson that can help to create wind.
1. Warm air rises
2. Cool air sinks
3. The Tropopause acts as a "lid" to rising air

Now let's put all of these factors together to see how a breeze can be created at ground level.