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The low-pressure area may have failed to hatch for a second successive time but that would not prevent the rain from coming down heavily over Tamil Nadu and Puducherry.
More importantly, the troughs in the Bay of Bengal have merged and the combined entity will be responsible for driving heavy to very heavy rain in the region variously until Friday.
Heavy rain The Met Department forecast for the next four days is as follows:
Tuesday: Heavy to very rain at isolated places over Tamil Nadu, Puducherry and coastal Andhra Pradesh and heavy over Rayalaseema and Kerala.
Wednesday: Heavy to very rain at isolated places over Tamil Nadu, Puducherry, coastal Andhra Pradesh and Rayalaseema and heavy over Kerala.
Thursday: Heavy rain at isolated places over Tamil Nadu, Puducherry, coastal Andhra Pradesh, Rayalaseema and Kerala.
Friday: Heavy rain at isolated places over Tamil Nadu and Puducherry.
Extended outlook Extended forecast the next two days that follow (until Monday, December 7) spoke about the possibility of rain or thundershowers at many places over South Peninsula and a few places over the larger Peninsula.
The US Climate Prediction Centre sees heavy to very heavy rain all along the coast, heavier to the North (around Chennai), until Saturday.
Its forecast for the week until December 12 says that the rains may relent somewhat over south coastal Tamil Nadu but continue to hold strong over the North (including Chennai).
The US National Centres for Environmental Prediction is of the view that the rain would be heaviest over Coastal Andhra Pradesh and adjoining Chennai during the week ending Tuesday next (December 8).
Some very heavy rain is forecast for the West Coast and parts of interior peninsula also during this period.
Dense fog The week that follows will see a sudden withdrawal of the wet spell over coastal Andhra Pradesh and north Tamil Nadu although central and south Tamil Nadu could remain periodically wet.
Meanwhile in North and North-West India, dense to very dense fog enveloped many part from west Rajasthan and Uttar Pradesh.
The causative western disturbance (the main weather-generating system during winter), a low-pressure system, was located over Afghanistan on Monday and is on its way to Pakistan and North-West India.
Dense fog will expand coverage to East and North-East India during the next two days, the IMD said. Shallow to moderate fog will engulf the entire area from North-West India to the East and North-East during this period.
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