The Tamil Nadu Coast
Explanation
The mechanism of the Northeast Monsoon, also known as the winter monsoon. During the winter season, the Inter-Tropical Convergence Zone (ITCZ) shifts southward, and the Northeast Trade Winds re-establish over the Indian subcontinent. These winds generally blow from land to sea, making them dry over most of the country.
Detailed Analysis:
- Mechanism of Rainfall: As the Northeast Trade Winds blow from the high-pressure area over the Indian landmass towards the low-pressure area over the Indian Ocean, they pass over the Bay of Bengal.
- Moisture Acquisition: During their passage over the Bay of Bengal, these winds pick up significant moisture.
- Precipitation: When these moisture-laden winds strike the Coromandel Coast (Tamil Nadu Coast), they are obstructed by the Eastern Ghats, leading to orographic rainfall. Consequently, this region receives the bulk of its annual rainfall during the winter season (October to December).
- Other Regions:
- The Malabar Coast (Kerala), Konkan Coast (Maharashtra/Goa), and Gujarat Coast are located on the western side of India.
- During winter, the Northeast Trade Winds are offshore (blowing from land to sea) in these regions and do not carry moisture, resulting in dry conditions.
Key Takeaway:
The Tamil Nadu Coast is the only major region in India that receives the majority of its rainfall during the winter season due to the moisture-laden Northeast Trade Winds blowing from the Bay of Bengal.