1. Chapter 15
The Atmosphere

2. Chap 15, Sect 3 (Global Winds and Local Winds)
Objectives:
Explain the relationship between air pressure and wind direction.
Describe global wind patterns.
Explain the causes of local wind patterns.

3. Equator – warm, less dense air rises and creates an area of LOW pressure.
Poles – cold, more dense air sinks and creates an area of HIGH pressure.
How does air move?

4. Air moves down the alphabet from H pressure to L pressure
Air moves down the alphabet from H pressure to L pressure! (A – air and alphabet…..H comes before L)
What is wind?

5. What are some common global wind patterns?
Prevailing Westerlies
found between 30° and 60° latitude
travel from West to East
carries the air (for the most part) across the United States
What are some common global wind patterns?

7. Doldrums
located where the trade winds of the two hemispheres meet at the equator
means “dull” or “sluggish”
an area of Low pressure

8. How do local winds form?
Sea and Land Breezes

9. Sea Breeze (Paste the picture you received in class)

10. Land Breeze (paste the picture you received in class)