Which Wind Accounts for Rainfall along the Malabar Coast?

By Devyani Singh|Updated : September 5th, 2022

Rainfall on the Malabar Coast is caused by southwest monsoon winds. Malabar Coast has significant rainfall in June and July due to its location as the first region to be affected by the southwest monsoon. A cyclic cycle of seasons is created by seasonal changes in wind patterns and the accompanying weather. India's weather is referred to as the "monsoon" kind. South Asia and South-East Asia have monsoon-type climates.

Rainfall along the Malabar Coast

Monsoon is an important season in India. One of the primary factors on which agriculture depends, it is necessary to understand the working of this season and what affects it. 

Advancement of Monsoon in India

  • The monsoon lasts for 100 to 120 days. The monsoon moves forward quickly but retreats gradually.
  • The monsoon typically begins in the first week of June in the southernmost point of the Indian peninsula.
  • It splits into two branches: one for the Arabian Sea and one for the Bay of Bengal.
  • By the first of June, the southwest monsoon begins to affect Kerala's coast.
  • They arrive in Mumbai and Kolkata, respectively, by June 10 and June 13.
  • By the middle of July, the Southwest monsoon has reached the entire subcontinent.
  • The Bay of Bengal branch reaches Assam around the first week in June.
  • The Himalayan mountains cause these winds to be refracted westward over the Ganga plains.
  • By mid-June, the Arabian Sea arm of the monsoon winds has completely enveloped the country's centre and the Saurashtra-Kuchchh area.
  • Over the western portion of the Ganga plains, the Arabian Sea branch and the Bay of Bengal branch of the monsoon combine.
  • Typically, Delhi receives rain towards the end of June thanks to the Bay of Bengal branch.
  • By the first week of July, Eastern Rajasthan, Western Uttar Pradesh, Punjab, and Haryana often experience the monsoon season.
  • By mid-July, Himachal Pradesh and the rest of the nation typically get rain.

Southwest Monsoon Winds

  • The southwest monsoon winds are in charge of bringing copious amounts of rain to the Indian subcontinent.
  • When southwest monsoon winds pass over warm oceans, they pick up moisture.
  • The air is moving south-easterly over the southern Indian Ocean. Air travels from an area of high pressure to one of low pressure. The air turns toward the Indian subcontinent, which has low pressure zones, once it passes the equator.
  • In this area, the upper air circulation is dominated by the westerly flow.
  • This Westerly flow contains a significant amount of Jet Stream.
  • Since they are positioned between 27 and 30 degrees north latitude, these jet streams are also referred to as subtropical westerly jet streams.
  • These jet streams, with the exception of the summer, always blow south of the Himalayas over India.
  • During the summer, the subtropical westerly jet stream flows north of the Himalayas along with the sun's apparent motion.
  • A subtropical easterly jet stream passes through peninsular India during the summer at a latitude of roughly 14°N. Easterly jet streams are these.
  • The western cyclonic disturbances that affect India's northwestern and northern regions are caused by westerly flow.

The intensity of rainfall over the Western Coast is dependent on 2 major factors.

  • Along the eastern coast of Africa, the position of the equatorial jet stream.
  • The offshore meteorological conditions.

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FAQs

  • The Malabar Coast receives heavy rainfall from the Arabian Sea branch of the Southwest monsoon while Tamil Nadu receives scanty rainfall as it is located parallel to the Bay of Bengal branch and lies in the rain shadow area of the Arabian Sea branch.

  • The average annual rainfall in the Malabar region is very high which is more than 250 cm, it receives rainfall from the Arabian sea branch of the monsoon.

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