1. Warm air rises and cold air sinks.
Global Winds
Wind current on a global scale.
Warm air rises and cold air sinks.
Temperature Differences
Rising and sinking air makes pressure differences
Pressure Difference
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2. Global Temperature Patterns
The sun’s rays are weaker near the equator causing less warming. The air here is cool.
The sun’s rays are stronger near the equator causing more warming. The air here is warm.
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3. Air moves between the equator and the poles.
Global Winds
Hadley Cells.
Air moves between the equator and the poles.
Global Winds
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4. The Coriolis Effect Coriolis Effect
Air does not move in a straight line because of Earth’s rotation.
Coriolis Effect
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5. Global Winds Northern Hemisphere Southern Hemisphere
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6. Global Winds Remember, winds are named from where they come. 60°N 30°N
Polar Easterlies - From 90°N to 60°N - Deflected to right
60°N
Prevailing Westerlies - From 30°N to 60°N - Deflected to right
30°N
Easterly Trade Winds - From 30°N to O° - Deflected to right
Doldrums 0°
Easterly Trade Winds - From 30°S to 0° - Deflected to left
30°S
Prevailing Westerlies - From 30°S to 60°S - Deflected to left
60°S
Polar Easterlies - From 90°S to 60°S - Deflected to left
Mr. Fetch’s Earth Science Classroom