Types of permanent wind system

1.	Types of permanent wind system
Answer» Permanent or Prevailing or Planetary winds: These winds blow throughout the year from one latitude to another in the same direction due to the latitudinal difference in the air pressure. These are three major types of permanent winds. These are:(a) Trade winds:These winds blow from sub-tropical High Pressure Belts towards the Equatorial Low Pressure Belts. These winds are extremely steady. In the Northern Hemisphere, due to rotation of the Earth, the wind moving towards the Equator is deflected South-Westward and hence, it is named as ‘North-East Trade’. In the Southern Hemisphere, it is deflected towards the left and is known as ‘South-East Trade’.(b) Westerly winds: These winds blow from the Sub-Tropical High Pressure Belt towards Sub-Polar Low Pressure Belts between 35° and 60° North and South latitudes. In the Northern Hemisphere, these winds blow from the South-West to the North-East, and in the Southern Hemisphere from North-West to the South-East.(c) Polar winds: The winds blowing from North and South polar regions towards Circum-polar Low Pressure Belts are known as polar winds. In the Northern Hemisphere, they blow from North-East and in the Southern Hemisphere, they blow from South-East. These winds get deflected towards west in both the Hemispheres and are thus known as Polar Easterlies.

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