The severe cyclonic storm Jal, which remained stationary at about 650 kms from Chennai, would intensify further and cross the Tamil Nadu and Andhra Pradesh coast on Sunday night, regional weather office said on Saturday.
"Jal remained practically stationary and lay centered at about 500 kms east-northeast of Trinconamalee (Sri Lanka), 650 kms east-southeast of Chennai and 750 km southeast of Nellore."
"It would intensify further, move west-northwestwards and cross north Tamil Nadu and south Andhra Pradesh coasts between Puducherry and Nellore close to Chennai by Sunday night," the weather office said.
It will bring rain or thundershowers at most places with isolated heavy to very heavy falls over north coastal Tamil Nadu, Puducherry and south coastal Andhra Pradesh during next 24 hours beginning 8.30 am on Saturday.
South coastal Tamil Nadu would witness widespread rain over the next 48 hours, the weather office said.
Wind speed reaching 60-70 kmph to 80 kmph would prevail along and off North Tamil Nadu, Puducherry and south Andhra Pradesh coast from today and this may increase upto 120-130 kmph to 140 kmph at the time of landfall, it said.
Sea conditions will be very rough to high.
Meanwhile, Tamil Nadu government said fishermen have been asked to not to venture into the sea for fishing and collectors of respective districts have been asked to put in place required precautionary measures.