IMD issued a high alert as Cyclone Mandous is expected to make landfall in southeast India.
Up until the early hours of Saturday, the sea state is forecast to be high over the southwest Bay of Bengal and rough to very rough across neighbouring parts of the west-central and southeast Bay of Bengal, before gradually improving after that.
As Cyclone Mandous, which made landfall over the southwest Bay of Bengal on Wednesday night, headed west-northwest, the Indian Meteorological Department (IMD) on Thursday issued a high alert across north Tamil Nadu, Puducherry, and adjacent south Andhra Pradesh beaches between Puducherry and Sriharikota.
According to IMD, it was centred over the southwest Bay of Bengal on Thursday morning, about 550 km southeast of Chennai, 300 km east-northeast of Trincomalee, Sri Lanka, 420 km east-southeast of Jaffna, Sri Lanka, and 460 km east-southeast of Karaikal.
The weather forecasting agency has anticipated rain due to cyclonic development over the Bay of Bengal.
Predictions indicate that numerous places will likely experience extremely heavy rain over the next two days.
On Thursday, it added, light to moderate rain is predicted in most parts with isolated heavy to very heavy falls over coastal Tamil Nadu, Puducherry, and Karaikal as well as isolated heavy rain over nearby portions of south coastal Andhra Pradesh and Rayalaseema.
Additionally, Friday is expected to see isolated heavy to very heavy rainfall likely over adjoining south Coastal Andhra Pradesh and north interior Tamil Nadu and Rayalaseema, light to moderate rainfall in most places with heavy to very heavy rainfall in a few places and extremely heavy rainfall in isolated places.
Winds gusting between 40 and 50 kilometres per hour are expected to start along and off the coasts of Tamil Nadu, Puducherry, south Andhra Pradesh, and north Sri Lanka on Thursday afternoon. Winds will increase to 50 to 60 kilometres per hour on Friday morning and 65 to 75 kilometres per hour gusting to 85 kilometres per hour on Friday night and early Saturday morning, according to the IMD.
The warning states that until early Saturday morning, sea conditions are forecast to be high over the southwest Bay of Bengal and rough to very rough over nearby parts of the west-central and southeast Bay of Bengal, before gradually improving after that.
On Thursday, Friday, and Saturday, sea conditions are predicted to be severe to very rough along the shores of south Andhra Pradesh, Tamil Nadu, Puducherry, and Sri Lanka.
Low-lying parts of north coastal Tamil Nadu and Puducherry are anticipated to be inundated at the time of impact by a storm surge that is approximately 0.5 m high above the astronomical tide.
The IMD has also put fishermen on red alert and declared a complete shutdown of fishing operations from Thursday to Saturday. People are urged to use caution when stepping outside and to stay away from weak structures.