1. WIND
The horizontal movement of air from an area of high pressure to an area of low pressure

2. What causes Winds? Differences in air pressure
Heating of the air , decreases pressure. Warm air rises creating a low pressure
Cool air rushes in to replace the warm air. Cooler, dense air produces a high pressure
As air goes from high to low pressure, winds form

3. MEASURING WINDS Described by direction & speed
The name of a wind tells where it is coming from
Wind speed is measured with a anemometer
Wind-chill factor is the increased cooling that a wind can cause

4. LOCAL WINDS Blow over short distances
Caused by unequal heating of the Earth’s surface within a small area
Two types
Sea Breezes: winds that blow from a body of water onto land
Land Breezes: winds that blow from land to a body of water

5. LOCAL WINDS

6. GLOBAL WINDS
Winds that blow steadily from specific directions over long distances
Created by unequal heating of the Earth’s surface
Produced by the movement of air pressure between the equator and the North & South Poles
Coriolis Effect: the way Earth’s rotation makes winds curve
Northern Hemisphere: winds curve to the right
Southern Hemisphere: winds curve to the left

7. CORIOLIS EFFECT

8. GLOBAL WIND BELTS
Doldrums: regions near the equator with little or no winds. Calm and weak
Trade Winds: warm air rising from the equator cools and sinks. Located between 30°N & S of equator. Calm, few clouds, little rain fall
Prevailing Westerlies: located in the belt from 30-60° latitude in both hemispheres. Strong winds. Impacts US weather
Polar Easterlies: cooling takes place between 50-60° latitude as approaching the poles. Cold, weak winds. Impacts US weather

9. GLOBAL WINDS

10. JET STREAMS
Bands of high-speed winds about 10 km above Earth’s surface (upper Troposphere)
Blow from west to east at speeds of km/hr
Help to move storms
Referred to as head or tail winds (flight)

11. GLOBAL WINDS
Create an Acrostic Poem using Global Winds