PPT: Permanent Winds Notes | EduRev

Geography for UPSC CSE

UPSC : PPT: Permanent Winds Notes | EduRev

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Classification of Winds • Permanent winds or Primary winds or Prevailing winds or Planetary 
Winds • The trade winds, westerlies and easterlies.
Page 3


Classification of Winds • Permanent winds or Primary winds or Prevailing winds or Planetary 
Winds • The trade winds, westerlies and easterlies. Primary Winds or Prevailing Winds or 
Permanent Winds or Planetary Winds
Page 4


Classification of Winds • Permanent winds or Primary winds or Prevailing winds or Planetary 
Winds • The trade winds, westerlies and easterlies. Primary Winds or Prevailing Winds or 
Permanent Winds or Planetary Winds
Page 5


Classification of Winds • Permanent winds or Primary winds or Prevailing winds or Planetary 
Winds • The trade winds, westerlies and easterlies. Primary Winds or Prevailing Winds or 
Permanent Winds or Planetary Winds Trade Winds • The trade winds are those blowing from the sub-tropical high 
pressure areas towards the equatorial low pressure belt. • Therefore, these are confined to a region between 30°N and 30°
S throughout the earth’s surface. • They flow as the north-eastern trades in the northern hemisphere and 
the south-eastern trades in the southern hemisphere. • This deflection in their ideally expected north-south direction is explained 
on the basis of Coriolis force and Farrel’s law. • Trade winds are descending and stable in areas of their origin 
(sub-tropical high pressure belt), and as they reach the equator, they 
become humid and warmer after picking up moisture on their way. • The trade winds from two hemispheres meet at the equator, and due to 
convergence they rise and cause heavy rainfall. • The eastern parts of the trade winds associated with the cool ocean 
currents are drier and more stable than the western parts of the ocean.
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