The Department of Meteorology says that there is a possibility of developing a low pressure condition in the atmosphere around the North Bay of Bengal tomorrow (29th)

A low-pressure area is likely to form over Northern Bay of Bengal tomorrow. Very strong winds (70-80) kmph accompanied with heavy rainfalls and very rough seas are likely over above sea areas. 

Naval and fishing communities in the above sea areas are requested to be attentive to future forecasts issued by the Department of Meteorology in this regard.
Condition of Rain:
Several spells of showers may occur in the sea areas off the coast extending from Mullaittivu to Hambanthota via Puttalam, Colombo and Galle.
Winds:

Winds will be south-westerly in direction and wind speed will be (30-40) kmph.

Wind speed can increase up to (50-60) kmph at times in the sea areas off the coasts extending from Trincomalee to Chilaw via Kankasanthurai and Mannar and from Hambantota to Pottuvil.

State of Sea:
The sea areas off the coasts extending from Trincomalee to Chilaw via Kankasanthurai and Mannar and from Hambantota to Pottuvil will be rough at times.