The Onset Of The Monsoon And Withdrawal

Wind, Storms And Cyclones of Class 7

Factors of The Onset Of The Monsoon And Withdrawal

  • The monsoons are not steady winds like trade winds. They are pulsating in nature and are affected by different atmospheric conditions.

  • The duration of the monsoon is between 100-120 days from early June to mid-September. Around the time of its arrival, the normal rainfall increases suddenly and continues constantly for several days. This is known as the ‘burst’ of the monsoon, and can be distinguished from the pre-monsoon showers.

  • The monsoon arrives at the southern tip of the Indian peninsula generally by the first week of June. It divides into two, the Arabian Sea branch and Bay of Bengal branch.

  • The Arabian Sea branch reaches Mumbai about ten days later on approximately the 10th of June.

  • The Bay of Bengal branch also advances rapidly and arrives in Assam in the first week of June.

  • By mid-June the Arabian Sea branch of the monsoon arrives over Saurashtra-Kuchcha and the central part of the country.

  • The Arabian Sea and the Bay of Bengal branches of the monsoon merge over the northwestern part of the Ganga plains.

  • The loft Himalayas causes the monsoon winds to deflect towards the west over the Northern plains.

  • By the first week of July, western Uttar Pradesh, Punjab, Haryana and eastern Rajasthan experience the monsoon. By mid-July, the monsoon reaches Himachal Pradesh and the rest of the country.

  • The withdrawal of the monsoon begins in northwestern states of India by early September. By mid-October it withdraws completely from the northern half of the peninsula.

  • By early December, the monsoon has withdrawn from the rest of the country.

  • The withdrawal, takes place progressively from north to south from the first week of December to the first week of January. By this time the rest of the country is already under the influence of the winter monsoon.

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