Rain and thundershowers lashed many places over Tamil Nadu, Puducherry and Karaikal and at a few places over Coastal Andhra Pradesh, Yanam, Rayalaseema and South Interior Karnataka during the 24 hours ending on Friday morning, an India Meteorological Department (IMD) update said. Heavy rainfall was reported at isolated places over Tamil Nadu, Puducherry and Karaikal during this period.

High precipitation figures(above seven cm) are Kollidam-11; Parangipettai-10; Chidambaram-9; Cuddalore, Velankanni and Sirkali-8 each; Taramani ARG Chennai), Sembanarkoil, Annamalai Nagar, Thalaignayer, Collectorate (Cuddalore), Ponneri, Karaikal, Tirupoondi, Puducherry, Mahabalipuram, Vedaranyam, Mayiladuthurai, Chennai-Nungambakkam; Kattukuppam and Villivakkam-7 each. 

Fresh low-pressure area soon

Meanwhile, the IMD has officially declared a watch for a fresh low-pressure area likely forming over the South-East Bay of Bengal and adjoining Andaman Sea in the next 5-6 days (around November 16), the possibility of which has been alluded to already in these columns. It will emerge from a ‘charged-up’ environment around the Malacca Strait-South China Sea-Sumatra Island belt, before being piloted by the winds into extreme South-Central Bay by November 16, as per IMD’s numerical model runs. 

More rain to come

It may take its own time to glide towards the Chennai coast or neighbourhood three days hence on November 19. It will send a narrow band of heavy to very heavy showers into Central Tamil Nadu, the ghats and Kerala and extend the rain cover to the North as far as Telangana, Vidarbha and parts of West Maharashtra between November 19 and 27, says an updated outlook from the US National Centres for Environmental Prediction. An IMD outlook for November 16-18 signalled widespread light to moderate rainfall with isolated heavy rainfall over Andaman and Nicobar Islands and isolated to scattered over many parts of the South Peninsula.

Track of existing ‘low’

The IMD said the rain-driving well-marked low-pressure area lay over the South-West Bay of Bengal,  adjoining North-East Sri Lanka and off the Tamil Nadu coast on Friday afternoon. It is expected to move towards the Tamil Nadu-Puducherry coasts till Saturday morning. Thereafter, it will move across interior Tamil Nadu-Puducherry and adjoining Kerala and will step out into the South-West and adjoining East-Central Arabian Sea weakened back as a low-pressure area/cyclonic circulation on Sunday. 

This movement of the system will continue to trigger fairly widespread to widespread rainfall with isolated heavy rainfall over Tamil Nadu, Puducherry, Karaikal, Rayalaseema, South Coastal Andhra Pradesh, Kerala and Mahe for two more days until Monday. Heavy to very heavy rainfall at a few places is likely over the North Coastal Tamil Nadu, Puducherry and Karaikal and adjoining areas with isolated extremely heavy rainfall at isolated places. 

Warning to fishermen

It will be heavy to very heavy rain at a few places over North Interior Tamil Nadu; and heavy to very heavy rainfall at isolated places over North Tamil Nadu, Puducherry and Karaikal on Saturday. Fishermen are advised not to venture into the South-West and adjoining West-Central Bay along and off the South Andhra Pradesh-Tamilnadu-Puducherry-Sri Lanka coasts; the Gulf of Mannar; and adjoining Comorin area on Saturday; and over South-East & adjoining East-Central Arabian Sea along and off the Kerala coast, Lakshadweep area and the Maldives-Comorin area on Monday and Tuesday.