Consider the following statements relating to cyclone, anti cyclone and trade wind :

1. The wind direction is clockwise in the cyclone of northern hemisphere

2. The planetary wind that blows from north-east to north-west is known as north-east trade wind

3. The wind direction is anti clockwise in the anticyclone of southern hemisphere

4. Both westerlies and trade winds originate from sub-tropical highs

Which of the statements given above is/are correct?

The correct answer is 3 and 4 only.

Key Points

• Cyclone:
  • It is a large scale air mass that rotates around a strong center of low atmospheric pressure.
  • The wind direction is counter-clockwise in Northern Hemisphere and clockwise in Southern Hemisphere. So, statement 1 is NOT correct.
• Anti-Cyclone:
  • It is a large-scale circulation of winds around a central region of high atmospheric pressure.
  • The wind direction is clockwise in the Northern Hemisphere and counter-clockwise in the Southern Hemisphere. So, statement 3 is correct.
• ​North-East trade wind:
  • ​It blows from North-East to South-West. So, statement 2 is NOT correct.
• Trade winds originate from sub-tropical high and blow from the Northeast in the Northern Hemisphere and from the Southeast in the Southern Hemisphere.
• Westerlies originate from sub-tropical high and blow from the Southwest in the Northern Hemisphere and from the Northwest in the Southern Hemisphere. So, statement 4 is correct.

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