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Consider the following statements- 1. These winds blow from the subtropical high-pressure belts towards the sub-polar low-pressure belts. 2. They are stronger in the southern hemisphere.  3. These winds are best developed between 40° and 65°S latitudes. Statements given-above are about which planetary wind?

Consider the following statements- 1. These winds blow from the subtropical high-pressure belts towards the sub-polar low-pressure belts. 2. They are stronger in the southern hemisphere.  3. These winds are best developed between 40° and 65°S latitudes. Statements given-above are about which planetary wind? Correct Answer Westerlies

The correct answer is Westerlies.

Key Points

  •  Westerlies:
    • The westerlies are the winds blowing from the subtropical high-pressure belts towards the subpolar low-pressure belts.
    • They blow from south­west to north-east in the northern hemisphere and north-west to south-east in the southern hemisphere.
    • The westerlies of the southern hemisphere are stronger and persistent due to the vast expanse of water, while those of the northern hemisphere are irregular because of uneven relief of vast land-masses.
    • The westerlies are best developed between 40° and 65°S latitudes.

Additional Information

  • Primary Winds or Prevailing Winds or Permanent Winds or Planetary Winds
    • These are the planetary winds which blow extensively over continents and oceans.
    • The two most well-understood and significant winds for climate and human activities are trade winds and westerly 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.
    • 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.
  • Polar easterlies:
    • The Polar easterlies are dry, cold prevailing winds blowing from north-east to south-west direction in Northern Hemisphere and south-east to the north-west in Southern Hemisphere.
    • They blow from the polar high-pressure areas of the sub-polar lows. 

Related Questions

Westerlies in the southern hemisphere are stronger and persistent than in the northern hemisphere. Why? 1. Southern hemisphere has less landmass as compared to the northern hemisphere. 2. Coriolis force is higher in the southern hemisphere as compared to the northern hemisphere. Which of the statements given above is/are correct?
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Which of the statements given above is/are correct?
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