1. 6.5: Wind
Unit 6: Meteorology
March 6, 2012
Sanders

2. Wind Wind is air in motion.
It is the natural horizontal motion of the atmosphere.
Wind is the horizontal movement of air.
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Unit 6: Meteorology

3. Measuring Wind Wind has two qualities:
Vector
Speed
An anometer measures wind speed.
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Unit 6: Meteorology

4. Wind Vane A weather vane measures wind direction.
Winds are named for the direction which they come from.
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Unit 6: Meteorology

5. Air Currents
The motion in a vertical, or nearly vertical, direction is called a current.
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Unit 6: Meteorology

6. What Causes Wind? Winds are produced by atmospheric differences in
Pressure
temperature
This is caused by heat from the sun.
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Unit 6: Meteorology

7. Breezes When the temperatures of neighboring regions become uneven.
The warmer air tends to rise and flow over the colder, heavier air.
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Unit 6: Meteorology

8. Breezes
Winds that begin in this way are usually affected by the earth's rotation.
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Unit 6: Meteorology

9. Land / Sea Breezes
Variations occur in temperature and pressure over land and water.
The land is warmer than the sea by day
It is colder than the sea by night.
, diurnal changes, which apply a similar but more local effect.
The variations of pressure thus induced evoke a system of breezes directed landward during the daytime and seaward at night. These land and sea breezes penetrate to a distance of about 50 km on and off the shore.
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Unit 6: Meteorology

10. Valley / Mountain Breezes
Similar daily changes in temperature occur over irregular terrain and cause
Valley breeze
Mountain breezes
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Unit 6: Meteorology

11. Other Winds Other winds induced by local phenomena include whirlwinds
winds associated with thunderstorms
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Unit 6: Meteorology