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COUNTRY RECEIVES ABOVE NORMAL RAINFALL DURING MONSOON SEASON THIS YEAR

COUNTRY RECEIVES ABOVE NORMAL RAINFALL DURING MONSOON SEASON THIS YEAR

Context

The country has received above normal monsoon during the four-month South West Monsoon season from June to September.

Onset of Monsoon

Conditions for Onset of Monsoon:

  • Westerly jet streams which blow over the Indian subcontinent during the winter months, has a southern branch fixed over the northern plains.
  • Low pressure at ITCZ which is located over north India in month of May becomes intense, pulls the trade winds of the southern hemisphere northwards
  • Trade winds cross the equator and enter the Bay of Bengal and the Arabian Sea.
  • Sudden onset of the moisture-laden winds associated with violent thunder and lightning, termed as the “break” or “burst” of the monsoons.Monsoon is said to have arrived over the subcontinent.

Branches of Southwest Monsoon:

  • Bay of Bengal Branch Brings rain to the north eastern part of the country, bring rains from the eastern to the western part of northern India; Garo and Khasi hills of Meghalaya. Mawsynram receives the highest average annual rainfall in the world due to this branch.
  • Arabian Sea Branch: Causes orographic rainfall at Western Ghats; Eastern Ghats don’t receive rainfall; Strikes the coast north of Mumbai; Moving along the Narmada and Tapi river valleys, causes rainfall in Central India.

The two monsoon systems meet around the region of western Uttar Pradesh and the rains occur towards the end of June.

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