1. Taught by Mohammed Al Nami
Lesson 2.1 & 2.2
Taught by Mohammed Al Nami
Khaled Al Ghannam
Faisal Al Saleh
Mohammed Al Mohammed

2. What is wind? Air that moves horizontally
Moves from an area of high pressure to low pressure
Is parallel to the ground

3. How is wind generated?

4. The Coriolis Effect The effect of the Earth’s rotation.
For example, ground near the poles doesn't spin as fast as ground near the equator.
This affects wind too

5. Wind Patterns/Wind Belts
Caused by the Coriolis effect
Hot air rises to the atmosphere
Gets to the poles
Cools down and sinks as wind
Wind rushes to the equator in a straight line, but is bent by the Coriolis effect

6. Calm Regions Most “calm” regions don’t have many strong winds
The Doldrums are a low pressure zone near the equator. It’s air rises up to the poles.
During hot months, there is a lot of rain.

7. Horse Latitude High pressure zones around 30◦N and 30◦N
Warm air cools down and sinks here
Weather is clear and dry

8. The Trade Winds East to west From Horse Latitude
Die out near the equator

9. The Westerlies From west From Horse Latitude to poles
They bring storms

10. The Easterlies
Blow from east, from polar regions to the mid-altitudes.
Storms caused when Easterlies meet Westerlies.

11. Air Pressure Decreases the higher you get
Would not be able to breathe without it

12. Vocabulary Coriolis Effect: The effect of Earth’s rotation.
Air Pressure: The weight of the atmosphere on the Earth’s surface.
Barometer: An instrument to measure air pressure.

13. Summary Wind is generated by hot air rising up
The Coriolis Effect: The effect of the Earth’s rotation
The Westerlies and Easterlies
Horse latitudes are high pressure
Calm regions are low pressure

14. Thank you all for listening!
Mohammed Al Nami
Faisal Al Saleh
Khaled Al Ghannam
Mohamed Al Mohammed