The low-pressure area from the Gulf of Thailand has entered the South Andaman Sea and weakened as a trough, an India Met Department (IMD) update at noon said.
But a large mass of cloud was hovering in the region bounded by the Malay peninsula and across Phuket in Thailand, spreading out over extreme South-East Bay of Bengal and South Andaman Sea.
The trough in the Andaman Sea and the low-pressure area over the South-West Bay have got inter-connected and would drive the North-East monsoon towards the Tamil Nadu-Andhra Pradesh coast.
The combine would rule the roost for the next three-four days, even as the trough in the South Andaman Sea gets a move into adjoining Bay of Bengal, where it may intensify into a 'low.'
The 'charged-up' combine is forecast to approach the Tamil Nadu and Andhra Pradesh coast. During this time, the Andaman Sea is expected to erupt with fresh activity by tossing up a fresh 'low.'
The Tamil Nadu and Andhra Pradesh coast could, therefore, expect moderate to heavy rainfall into the next week, at least until November 13, according to IMD forecasts.
At around noon, satellite pictures showed clouds building up off the Tamil Nadu coast from Puducherry to Kalpakkam, Chennai, and Ponneri in Tamil Nadu and Nellore-Kavali in Andhra Pradesh.
Clouds are also spread out over North Kerala and adjoining Coastal Karnataka, North Interior and South Interior Karnataka.
A cyclonic circulation over Maldives is part of the network of weather systems responsible for setting up cloud cover over a large part of the South Indian Peninsula.