1. WIND

2. HOW DOES WIND FORM?

3. ATOMOSPHERIC PRESSURE
The weight of the air above us pushing down causes the atmospheric pressure.

4. ATMOSPHERIC PRESSURE The air is being pulled to the ground by gravity.
The more air there is above us, the greater the pressure.

5. Aneroid Barometer = "without" liquid
A barometer is an instrument used to measure atmospheric pressure.
Aneroid Barometer = "without" liquid

6. WIND
Wind is the horizontal flow of air. Differences in horizontal air pressure cause wind. Air flows from areas of higher pressure to areas of lower pressure.

7. WIND
Wind is basically nature’s attempt to balance inequalities in air pressure.
Since, unequal heating of Earth’s surface generates these pressure differences, solar energy is the ultimate energy source for most wind.
Wind moves from:
HIGH pressure low pressure

8. Local Winds
Whats happening here?

10. LOCAL WINDS

11. Local Breezes Causing Weather

12. Wind Belts (Northern Hemisphere)
Trade Winds
Winds flowing toward the equator between 30o and 0o latitude.
Flow from the Northeast, hence called “Northeast Trade Winds”

13. Wind Belts (Northern Hemisphere)
Westerlies
the prevailing winds in the middle latitudes between 30 and 60 degrees latitude.
blowing from the high pressure area in the horse latitudes towards the poles.

14. Wind Belts (Northern Hemisphere)
Polar Easterlies
dry, cold prevailing winds that blow from the high-pressure areas of the polar highs at the North poles towards the low-pressure areas of the polar fronts between 60 and 90 degrees.

15.    All free moving objects or fluids, including the wind, are deflected to the right of their path of motion in the Northern Hemisphere and to the left in the Southern Hemisphere.
This is known as the Coriolis Effect and is due to the rotation of Earth.

16. This same deflection is experienced by wind, and the apparent shift in wind direction is attributed to the Coriolis Effect.

17. Wind is controlled largely by the following two forces: 1
Wind is controlled largely by the following two forces: 1. Pressure Gradient Force
2. the Coriolis Effect.
ISOBARS show pressure differences that create wind and the greater these differences, the greater the wind speed.
Pressure data is shown on a weather map using isobars, which are black lines that connect places of equal air pressure.

18. Which way is the wind blowing?