After making landfall, Dianmu continued to weaken further into a low depression with winds gusting 40kph near its centre and dissipated in southern Laos hours later.
According to the National Centre for Hydro Meteorological Forecasting, lashing rain poured down overnight along the central coastal provinces from Quang Binh to Quang Ngai, plus Kon Tum and Gia Lai provinces in the Central Highlands, with rainfall exceeding the 100mm mark.
Torrential rain is expected to lash regional localities from Ha Tinh to Thua Thien Hue and then expand to Thanh Hoa, Nghe An and other localities in the north-central region on September 24-25. Rainfall totals can climb as high as 150mm or even 200mm.
Experts warned about possible flash floods and landslides in mountainous areas and flooding in low-lying and riverside areas.
Dianmu formed from a tropical low depression in the East Sea two days ago. It moved quickly towards central Vietnam but was downgraded to a tropical low depression after making landfall.