At 04pm Kompasu weakened into a low pressure and dissipated before it approached the mainland, according to the National Centre for Hydro-meteorological Forecasting.
However, its circulation is dumping heavy rain on the central coastal provinces from Thanh Hoa to Quang Tri.
Meanwhile, another cold front is moving from north to south, and it will interact with the low pressure to cause a spell of lashing rain in the central region from October 15 to October 18.
Nghe An province is forecast to record rainfall of between 100-200mm, while provinces from Ha Tinh to Thua Thien-Hue will likely to have rainfall totals of 300-600mm, or even more than 600mm.
Parts of Da Nang and Quang Nam are likely to receive between 100-300mm of rainfall.
Torrential rain has over the past few days caused water levels in major central rivers to rise to the first and second alert levels. Several sections of roads in Quang Binh and Nghe An have been flooded, disrupting traffic flows.
Weather experts warned of potential risks of flash floods and landslides in mountainous areas and flooding in low-lying areas, especially in Phu Tho, Yen Bai, Lao Cai, Hoa Binh, Thai Nguyen, Bac Kan, even Hanoi capital and from Thanh Hoa to Ha Tinh.