The Southern parts of India particularly Tamil Nadu and Andhra Pradesh receive…

India's monsoon rainfall is governed by a seasonal reversal of wind direction driven by differential heating between land and sea. In summer, moisture-laden winds blow from sea to land (the Southwest Monsoon); by autumn (October to December), the land cools faster than the sea, the pressure gradient reverses, and the wind now blows outward from the mainland toward the sea — this reversed circulation is called the retreating or Northeast Monsoon.

Tamil Nadu and Andhra Pradesh lie along India's south-eastern (Coromandel) coast, facing the Bay of Bengal. During the autumn reversal, winds move back from the Indian mainland toward the Bay of Bengal, picking up moisture as they cross it, then curve back onshore over this south-eastern coastal belt. This is why, unlike most of India, which receives its main rainfall from the Southwest Monsoon in June to September, Tamil Nadu and coastal Andhra Pradesh get a significant share of their annual rain from this autumn Northeast Monsoon episode.

Checking this against the other described wind patterns confirms the mechanism:

• Winds blowing from the Arabian Sea to the Bay of Bengal describe an established sea-to-sea current, not the land-originated seasonal reversal that defines the autumn monsoon; this does not correspond to that circulation shift at all.

• Winds blowing from the Bay of Bengal to the Arabian Sea simply reverse the compass direction without linking to any recognised seasonal wind system; India's monsoon reversals are not documented to run this way.

• Winds moving back from the mainland to the Arabian Sea are directed offshore at India's western coastline, carrying air away from the coast rather than drawing in moisture from the sea; this cannot generate the onshore, moisture-bearing flow that produces coastal rainfall, so it does not explain any rainfall episode, let alone the one on the south-eastern states named in the question.