At 1 am today the depression lay 330 km east of the coast between Ha Tinh and Quang Tri Provinces with winds of 39-49 kph and gusts of 62-75 kph.
In the next 24 hours it would move west-northwest at 15-20 km speed towards the southern part of the Gulf of Tonkin and possibly weaken into a low pressure, the center forecast.
At 1 pm tomorrow it is expected to make landfall between Nghe An and Quang Binh Provinces with winds of less than 39 kph.
The seas off Hoang Sa (Paracel) Island will experience winds of 45-62 kph and heavy rains and thunderstorms.
Medium to heavy rains will also occur in the region between Thanh Hoa and Thua Thien-Hue Provinces today.
Meanwhile, another tropical depression that is moving east of the Philippines is likely to intensify into a storm today, the center warned.
It is expected to move to the middle area of the East Sea tonight or early tomorrow.
According to the Steering Board for Flood and Storm Prevention and Control, the death toll in the floods caused by rising rivers in the Mekong Delta has risen to 29. Nine were killed in Dong Thap, six in Can Tho, five each in An Giang and Kien Giang, and four in Long An.
The floods have also damaged 60,000 houses and tens of thousands of hectares of rice and other crops, and swept away 5,500 meters of national highways and other roads.
Rivers in the regions would continue to rise, worsening the flooding, the board warned.