Moderate to heavy rain, with very heavy downpours in some areas, was recorded across the city between 1 am and 7 am on Friday, according to the Hue Department of Irrigation and Climate Change.
Rainfall reached 54.4 mm at Thuy Yen Reservoir in Chan May-Lang Co, 60 mm at Bach Ma National Park in Phu Loc and 67.2 mm in Xuan Loc, also in Phu Loc.
Soil moisture levels in some areas have exceeded 80 per cent or reached saturation, increasing the risk of flash floods along small mountain rivers and streams, as well as landslides and ground subsidence on steep slopes.
Widespread heavy rain is forecast from September 11 to 15, with the heaviest downpours expected between September 12 and 14. Total rainfall during the period is forecast at 250-400 mm, with some areas receiving more than 500 mm.
Authorities have issued warnings for 16 wards and communes, including Binh Dien, Chan May-Lang Co, Hung Loc, Phong Dien, Phu Loc, A Luoi 1-5, Khe Tre, Loc An, Long Quang, Nam Dong, Kim Long and Phu Bai.
Areas at risk include sections of national and highways, the Ho Chi Minh Road and the La Son-Tuy Loan Expressway, as well as mountain passes, riverbanks and communities in mountainous areas.
Specific risks include landslides along National Highway 49A in Binh Dien; the Phu Gia and Hai Van passes in Chan May-Lang Co; roads leading to Rao Trang 3 and 4 in Phong Dien; Phuoc Tuong Pass and the road to Bach Ma in Phu Loc; and several sections of the Ho Chi Minh Road through the A Luoi communes.
Authorities warned that flash floods and landslides could threaten lives, block roads and damage homes, infrastructure and construction sites along rivers and streams.
Residents have been advised to exercise particular caution when travelling through flooded roads, spillways, small bridges and steep terrain.