Explanation: The South West Monsoon is a significant weather phenomenon in India, bringing heavy rainfall to the country, particularly to the western coast. This monsoon season typically occurs from June to September and is characterized by winds that blow from the southwest, carrying moisture from the Indian Ocean.
The monsoon winds are influenced by the topography of the Indian subcontinent, particularly the Western Ghats, a mountain range that runs parallel to the western coast of India. As the monsoon winds encounter the Western Ghats, they are forced to rise, cool, and condense, resulting in heavy rainfall on the windward side of the mountains. This is why states like Kerala, which are located on the western coast, experience significant rainfall during the South West Monsoon.
In contrast, the eastern coast of India, including parts of Tamil Nadu, remains relatively dry during this period. The Western Ghats act as a barrier, preventing the moisture-laden winds from reaching the eastern coast. As a result, Tamil Nadu, which is located on the eastern side of the Western Ghats, does not receive the same level of rainfall as the western coast during the South West Monsoon.
It is important to note that while Tamil Nadu remains relatively dry during the South West Monsoon, it does receive significant rainfall during the North East Monsoon, which typically occurs from October to December. During this period, the winds blow from the northeast, bringing moisture from the Bay of Bengal, resulting in heavy rainfall in Tamil Nadu.
Understanding the impact of monsoon winds on different regions is crucial for comprehending the seasonal patterns of rainfall in India. This knowledge is particularly important for agricultural planning, water resource management, and disaster preparedness in various states, including Tamil Nadu.
In summary, the South West Monsoon primarily affects the western coast of India, leaving the eastern coast, including parts of Tamil Nadu, relatively dry. This is due to the geographical position of Tamil Nadu and the influence of the Western Ghats on the monsoon winds. Therefore, the correct answer is Tamil Nadu.