Chennai: The well marked low pressure area over the bay would concentrate into a depression and intensify further into a cyclonic storm and cross the coast between Mahabalipuram, about 55 km from here, and Karaikal in Puducherry on 25 November.
The Met office has issued a Red Alert for Tamilnadu, Puducherry and Karaikal on 25 November.
A bulletin issued by the Indian Meteorological Department (IMD) on Sunday said the well marked lower pressure area over the southwest and adjoining southeast Bay of Bengal persists over the same region.
“It is very likely to concentrate into a depression over Southwest Bay of Bengal during next 24 hours and intensify further into cyclonic storm during the subsequent 24 hours”, it said.
It is very likely to move northwestwards and cross the Tamilnadu and Puducherry coasts between Karaikal and Mahabalipuram around 25 November noon/afternoon, the IMD said.
Under its influence, the rainfall activity is likely to increase over south peninsular India from 23 November onwards with fairly widespread to widespread rainfall and thunderstorm activity over Tamilnadu, Puducherry and Karaikal from 24 to 26 November and over south Coastal Andhra Pradesh, Rayalaseema and Telangana on 25 and 26 November.
Isolated extremely heavy rainfall is also very likely over Tamilnadu and Puducherry on 24 and 25 November and over south Coastal Andhra Pradesh and Rayalseema on 25 and 26 November and over Telangana on 26 November.
Squally weather with wind speed reaching 40-50 kmph and gusting to 60 kmph is likely to prevail over Equatorial Indian Ocean and adjoining central parts of South Bay of Bengal.
It is likely to increase with wind speed of the order of 45-55 kmph and gusting to 65 kmph, over Southwest and adjoining westcentral Bay of Bengal and along and off Tamilnadu and south Andhra Pradesh coasts tomorrow and of the order of 55-65 kmph, gusting to 75 kmph, over the same area and also along and off South Andhra Pradesh coast and over Gulf of Mannar on 24 November.
It is very likely to increase gradually becoming 80-90 kmph, gusting 100 kmph, over southwest Bay of Bengal and along and off Tamilnadu and Puducherry coasts around the region of landfall on 25 November.
Squally weather with wind speed reaching 55-65 kmph and gusting to 75 kmph is likely to prevail over Andhra Pradesh coast on 25 November.
The sea condition will be rough to very rough over equatorial Indian Ocean and adjoining central parts of South Bay of Bengal. Southwest and adjoining west-central Bay of Bengal and along and off Tamilnadu and Puducherry coasts today and very rough to high over southwest and adjoining west-central bay of bengal and along and off Tamilnadu, Puducherry and south Andhra Pradesh coasts and also over Gulf of Mannar on 24 and 25 November.
Fishermen are advised not to venture into the sea over southwest and adjoining west-central Bay of Bengal, Gulf of Mannar and along and off Tamilnadu, Puducherry and south Andhra Pradesh coasts from today till 25 November. Also the fishermen in sea are advised to return to the coast.