Tamil Nadu coast gets a large portion of its rain during ________ and __________.
October and November
Understanding Rainfall Patterns on the Tamil Nadu Coast
India's climate is heavily influenced by the monsoon winds. There are primarily two monsoon seasons that affect the country: the Southwest Monsoon and the Northeast Monsoon.
The question asks about the months when the Tamil Nadu coast receives a large portion of its rain. Let's look at how the monsoons affect this region.
The Southwest Monsoon (June to September)
The Southwest Monsoon brings rain to most parts of India. However, the Tamil Nadu coast receives comparatively less rainfall during this season. This is because it lies in the rain shadow area of the Western Ghats mountain range. As the moisture-laden winds from the Arabian Sea strike the Western Ghats, they cause heavy rainfall on the western side (windward side). By the time these winds descend on the eastern side (leeward side), they have lost much of their moisture, resulting in less rain for the Tamil Nadu coast during the Southwest Monsoon.
The Northeast Monsoon (October to December)
The Northeast Monsoon, also known as the retreating monsoon, blows from land towards the sea. When these winds blow over the Bay of Bengal, they pick up moisture. These moisture-laden winds then cause significant rainfall over the southeastern coastal regions of India, particularly the Tamil Nadu coast, coastal Andhra Pradesh, and Kerala.
The peak rainfall activity associated with the Northeast Monsoon for the Tamil Nadu coast typically occurs during the months of October and November. Sometimes, rainfall continues into December as well.
Analyzing the Options
- April and May: These months fall before the main Southwest Monsoon season. While some parts of India might experience pre-monsoon showers during this period, the major rainfall for the Tamil Nadu coast does not occur in April and May.
- October and November: As discussed, these months are the peak period for the Northeast Monsoon, which is the primary source of significant rainfall for the Tamil Nadu coast.
- May and June: May is part of the pre-monsoon season. June marks the beginning of the Southwest Monsoon, but as explained, the Tamil Nadu coast receives less rain during the main Southwest Monsoon season due to the rain shadow effect.
- August and September: These months are part of the Southwest Monsoon season. Again, the Tamil Nadu coast is in the rain shadow during this period and does not receive its major share of rain then.
Therefore, the Tamil Nadu coast gets a large portion of its rain during October and November due to the Northeast Monsoon.
| Monsoon Season | Typical Period | Impact on Tamil Nadu Coast |
|---|---|---|
| Southwest Monsoon | June - September | Receives less rain (rain shadow effect) |
| Northeast Monsoon (Retreating Monsoon) | October - December | Receives a large portion of its rain (especially Oct-Nov) |
Revision Table: Indian Monsoons and Rainfall
| Monsoon | Timing | Direction | Areas Mainly Affected |
|---|---|---|---|
| Southwest Monsoon | June to September | Sea to Land | Most parts of India (Western Ghats, Northeast India get heavy rain) |
| Northeast Monsoon | October to December | Land to Sea | Southeastern coast (Tamil Nadu, coastal Andhra Pradesh) |
Additional Information: The Northeast Monsoon
The Northeast Monsoon is crucial for the water requirements of Tamil Nadu and adjacent regions. While it is sometimes referred to as the "retreating monsoon," the rainfall during this season is mainly caused by the moisture picked up by the winds after crossing the Bay of Bengal. The cyclonic depressions and storms that form in the Bay of Bengal during this period also contribute significantly to the rainfall activity along the coast.
Understanding both the Southwest and Northeast monsoons is key to understanding the varied climate patterns across India.
Important Questions from Indian Climate
The hot weather season is also the season for localised thunderstorms, associated with violent winds, torrential downpours, often accompanied by hail. In West Bengal, these storms are known as the ______.
Which hills in Meghalaya receive the maximum rainfall?
In the summer season (around mid-July), the surface low-pressure belt, known as the Inter-Tropical Convergence Zone (ITCZ), shifts northward to lie roughly parallel to the Himalayas between __________.
The Season of Retreating Monsoon occurs during which of the following months in India?
The southwest monsoon is believed to engulf the entire subcontinent by mid ________.
