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Why are south-west monsoons less rainy in Chennai ?

Please answer soon....

Dear Student ,

If you observe the physical map of India, it will be noticiable that the eastern ghats are lower in altitude than the western ghats.

This makes the places in eastern ghats fall in the rainshadow region. It is due this altitude that the monsoon showers lose all the moisture on the western slopes of the western ghats and the rest of the plateau and the eastern ghats receives scanty rainfall.

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It is based on the 'Orography' of that region.
Western ghats are like a mountain-wall parallel to the thin west coast of Indian peninsula. Eastern ghats too are like that but less so. Both meet at 'Nilagiri' mountain knot on western ghats. This leaves the whole broad land of Tamilnadu to the east of Western ghats, or its extension known as 'Cardamom' hills (till Kanyakumari, the land's end) at the eastern margin of Kerala.
During SW Monsoon, the full fury is unleashed from the Arabian Sea on Western ghats and Kerala gets all the rain, leaving Tamilnadu (on the other side of Cardamom hills) in rain shadow. Chennai being in it suffers the same situation.
When the monsoon reverses in late autumn, to NE monsoon the same Tamilnadu plains experience the winter monsoon that hits the Cardamom hills from the east, this time.HOPE IT HELPS YOU!!!!!!!!!!!!!!!!!!!!!!!!

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Oh I saw this in Yahoo Answers Mukund...

Sorry..... I wanted another kind of answer.... 

Anyways.. thanks for ur concern

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