Chennai: The well-marked low-pressure area over north Sri Lanka and adjoining Gulf of Mannar has concentrated into a depression, the Indian Meteorological Department confirmed on Tuesday.
The depression is currently lying at 240 km south-southeast of Chennai and will move north northwest in the next 48 hours.
Under its influence, heavy rains would be witnessed in most places in coastal Tamil Nadu and isolated locations in interior regions of the state.
The IMD predicted heavy to very heavy rains in North Tamil Nadu and Puducherry.
Squally weather wind with wind speed reaching 50-60 kmph gusting to 70 kmph is also likely along and off the Tamil Nadu and Puducherry coasts, the IMD said.
As the sea condition would be rough to very rough in the region, fishermen have been advised not to venture into the sea.
Local cautionary signal number been kept hoisted at Nagapattinam, Karaikal, Pamban, Tuticorin, Rameswaram and Kolachal ports.