The document discusses global wind patterns that develop due to temperature differences between the equator and poles. Warm air rises at the equator, creating low pressure, while cold air sinks at the poles, creating high pressure. Air moves from high to low pressure areas, resulting in global wind currents called the prevailing westerlies, easterly trade winds, and polar easterlies in both hemispheres. The Coriolis effect causes these winds to curve right in the northern hemisphere and left in the southern hemisphere as they travel.

1. Where does this occur?
Wind current on a…
1. Local scale.
2. Global scale
WINDS ARE NAMED FROM WHERE THEY COME FROM!
SEA BREEZE Mountain BREEZE Prevailing
Westerlies
NE Trade
Winds
Polar
EasterliesLand BREEZE Valley BREEZE
LOCALIZED WINDS GLOBAL WINDS

2. Global Winds
• Wind currents that develop
on a GLOBAL SCALE over
long distances.
• Still a result of temperature
and pressure differences.
• Air moves
between the
warm equator
and the cold
poles.
Global
Winds

3. Global Temperature Patterns
So Air tries to move between the poles from a high to low
pressure = Global Winds
Strong Direct Sunlight!
Warm
Rising air = LOW
pressure
Weaker Indirect
Sunlight!
COLD
Sinking air = HIGH
Pressure

4. The Coriolis Effect
• Air does not
move in a
straight line
because of
Earth’s rotation.
Coriolis
Effect
Earth spin makes the wind curve
instead of traveling in a straight line.

5. Curve to the RIGHT in the
NORTHERN HEMISPHERE.
Curve to the LEFT in the
SOUTHERN HEMISPHERE.

7. Global Winds
LOW PRESSURE
HIGH PRESSURE LOW PRESSURE
HIGH PRESSURE
LOW PRESSURE
HIGH PRESSURE LOW PRESSURE
HIGH PRESSURE
Northern
Hemisphere
Southern
Hemisphere

9. POLAR EASTERLIES
Prevailing Westerlies
Easterly Trade Winds
Hadley
Cells.

10. Global Winds
60°
S
30°
S
0°
30°
N
60°
N
Prevailing Westerlies
- From 30°N to
60°N
- Deflected to right
Easterly Trade Winds
- From 30°N to O°
- Deflected to right
Polar Easterlies
- From 90°N to
60°N
- Deflected to right
Easterly Trade Winds
- From 30°S to 0°
- Deflected to left
Prevailing Westerlies
- From 30°S to
60°S
- Deflected to left
Polar Easterlies
- From 90°S to
60°S
- Deflected to left
Doldrums
Remember, winds are
named from where
they come.