Question

Why does the rainfall decrease from the east to the west in Northern India?

Answer 1

Due to reduction in the moisture content in the winds, the rainfall decreases from the East to West in Northern India.

• There is an intensification of low pressure situations over the northern plain, by early June. In the southern hemisphere the trade winds will be attracted by this. Warm subtropical areas of the southern oceans are the place where these south-east trade winds originate.
• These winds bring rain in India. Moisture is brought to the subcontinent in sufficient quantities, as these winds were blowing over warm oceans.
• These trade winds enter India as South west monsoon, they blow with an average velocity of 30 Km/hr.
• Generally by the first week of June, the monsoon arrives at the southern tip of the Indian peninsula.
• Later the Monsoon splits into two branches – the Bay of Bengal branch and the Arabian Sea branch.
• In Assam, the Bay of Bengal branch arrives by the first week of June.
• The Bay of Bengal branch of the monsoon reaches Delhi by the end of June.
• The Arabian Sea branch and Bay of Bengal branch of the monsoon merges over the Ganga plains, in its Northwestern part.