Monsoon winds are cool breezes that blow from the sea's surface to the land, bringing rains with them. The monsoon winds have a considerable influence on the climate of India. Southwest's Bay of Bengal Branch Monsoon flows over the Bay of Bengal, carrying additional moisture from the Bay of Bengal to north-east India and Bengal. The winds bring a lot of rain to the Eastern Himalayas. This article will explain to you the Monsoon winds of the Bay of Bengal which will be helpful in Geography preparation for the UPSC Civil service exam.

Monsoon winds of Bay of Bengal

• The Southwest Monsoon season in India begins in June with the arrival of the Southwest Monsoon winds and lasts until the middle of September.
• Due to the significant rise in temperature over the northern plains in May, the low-pressure conditions there become even more intense.
• During the summer, moist air from the Indian Ocean is pushed northward across the Indian subcontinent, producing rain.
• The southwest monsoon's Bay of Bengal Branch is separated into two main streams.
• The Bay of Bengal branch runs along the coasts of Myanmar and southeast Bangladesh.
• However, the Arakan Hills near Myanmar's coast divert a large chunk of this branch towards the Indian subcontinent.
• As a result, the monsoon approaches West Bengal and Bangladesh from the south and southeast rather than the south-westerly path.
• Under the influence of the Himalayas and the thermal low in northwest India, this branch breaks into two.
• Its one branch travels westward along the Ganga plains, all the way to the Punjab plains.

Monsoon Winds of Bay of Bengal

• The second branch flows north and northeast up the Brahmaputra valley, generating heavy rainfall.
• Its sub-branch runs across Meghalaya's Garo and Khasi hills. Mawsynram, located on the peak of the Khasi hills, has the world's greatest average yearly rainfall.
• During this season, the coast of Tamil Nadu remains dry. It can be attributed to two factors:
• The coast of Tamil Nadu runs parallel to the Bay of Bengal branch of the southwest monsoon.
• It is located in the rain shadow area of the southwest monsoon's Arabian Sea branch.
• The monsoon branches of the Arabian Sea and the Bay of Bengal meet over the northern region of the Ganga plains.
• By the end of June, Delhi usually receives monsoon rains from the Bay of Bengal branch.

Conclusion

The Southwest Monsoon season in India begins in June with the arrival of the Southwest Monsoon winds and lasts until the middle of September. The Bay of Bengal branch runs along the coasts of Myanmar and southeast Bangladesh. The Bay of Bengal branch is also moving quickly, and it will reach Assam in the first week of June. Because of the high mountains, the monsoon winds deflect westward across the Ganga plains.

FAQs

MCQs

1. Which of the following regions receives the heaviest rainfall due to the Bay of Bengal monsoon?

A) Western Ghats
B) Ganga Plains
C) Northeastern India
D) Tamil Nadu Coast

2. The Bay of Bengal monsoon branch is deflected westward by which geographical feature?

A) Aravalli Range
B) Western Ghats
C) Arakan Hills
D) Vindhya Range

3. Which Indian state is most affected by the Bay of Bengal monsoon?

A) Gujarat
B) Kerala
C) West Bengal
D) Maharashtra

4. When does the Bay of Bengal monsoon typically retreat from India?

A) September
B) November
C) July
D) August

5. Which factor enhances the intensity of the Bay of Bengal monsoon branch?

A) Proximity to the equator
B) Presence of the Himalayas
C) Cyclonic depressions
D) Temperature variations

GS Mains Questions and Model Answers

Q1: Discuss the role of the Bay of Bengal branch of the monsoon in shaping the climate of northeastern India.

Answer: The Bay of Bengal branch of the southwest monsoon plays a vital role in shaping the climate of northeastern India. It brings abundant moisture-laden winds that, upon encountering the Eastern Himalayas, result in orographic rainfall. This leads to heavy rainfall in states like Assam, Meghalaya, and West Bengal. The monsoon is critical for the agriculture, water supply, and ecosystems of the region.

Q2: Analyze the impact of cyclonic depressions on the Bay of Bengal monsoon system.

Answer: Cyclonic depressions forming over the Bay of Bengal significantly impact the monsoon by enhancing its intensity and contributing to heavy rainfall across the eastern and northeastern regions. These depressions are responsible for concentrated rainfall events, particularly in West Bengal, Odisha, and Bangladesh, affecting agriculture, infrastructure, and water management in these regions.

Q3: Explain how the monsoon winds from the Bay of Bengal affect the distribution of rainfall across India.

Answer: The Bay of Bengal monsoon winds affect rainfall distribution by first bringing heavy rains to the northeastern states and then gradually moving westward across the Ganga plains. The presence of the Himalayas deflects the monsoon winds, causing varied rainfall patterns. Coastal regions of West Bengal and Bangladesh receive more rain, while the intensity decreases as the winds move inland towards northwestern India.

Previous Year Questions on Bay of Bengal Monsoon

1. UPSC CSE Prelims 2021:

Question: Which geographical feature deflects the Bay of Bengal monsoon branch westward?

A) Eastern Ghats
B) Himalayas
C) Arakan Hills
D) Western Ghats

Answer: (C)

Explanation: The Arakan Hills in Myanmar deflect the Bay of Bengal monsoon branch westward, leading to heavy rainfall in eastern and northeastern India.

2. UPSC CSE Mains 2020 (GS Paper 1):

Question: "Examine the influence of the Bay of Bengal monsoon branch on India's agrarian economy and water resources."

Answer: The Bay of Bengal monsoon branch is crucial for India's agrarian economy, particularly in states like West Bengal, Bihar, and Assam. The monsoon's timely arrival ensures sufficient water for paddy cultivation and other crops, while cyclonic depressions further enhance water availability. However, erratic monsoon patterns can cause floods and droughts, affecting crop yields and water management systems.