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Westerlies UPSC NOTE

 Why in news

  • A shear zone runs over the south peninsular India, and a cyclonic circulation lies over the southeast Arabian Sea off south Kerala in the middle troposphere level. 

  • Strong westerly winds are also prevailing along the Kerala coast. 

  • Under its influence, the State is likely to experience widespread rainfall accompanied by thunderstorms, lightning, and gutsy winds with a speed of 30–40 kmph during the next seven days, says IMD

Westerlies & Impact on India

  • Westerlies are wind patterns that move from the West to the East

  • In both hemispheres, westerlies blow from the mid-latitudinal high-pressure belt to the subpolar low-pressure belt

  • They go from the southwest to the northeast in the Northern Hemisphere

  • They blow from the northwest to the southeast in the Southern Hemisphere

  • Compared to the westerlies in the Northern Hemisphere, the westerlies in the Southern Hemisphere are stronger and more reliable.

  • On the onset of the South-West Monsoon, The location of ITCZ shifts north and south of the equator with the apparent movement of the Sun.

  • During the month of June, the sun shines vertically over the Tropic of Cancer and the ITCZ shifts northwards.

  • The southeast trade winds of the southern hemisphere cross the equator and start blowing in southwest to northeast direction under the influence of Coriolis force.

  • These winds collect moisture as they travel over the warm Indian Ocean and rains over India

Shear Zone

  • A shear zone is a monsoon weather feature that is an area filled with opposing winds concentrating heavy rain in that zone.

  • An east-west shear zone located 10 degrees north over the southern peninsula is a vertical zone

  • It can prevail either in the lower, middle or upper atmospheric levels — allows active winds of high speeds to interact. 

  • This zone also allows monsoon winds to remain active, thus causing intense rainfall over the area under its influence.


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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Westerlies UPSC NOTE
Westerlies UPSC NOTE
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Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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