Storm No.4 Narra has killed 2 person and caused widespread flooding, landslides and property damage across northern Vietnam after dumping hundreds of millimeters of rain on the region.
1. Tropical Depression over the East Sea (weakened from Typhoon No. 4)
At 01:00 on 26 August, the center of the tropical depression was located at approximately 20.0°N and 109.7°E, over the coastal waters north of Hainan Island (China). Maximum sustained winds near the center were at Force 7, with gusts up to Force 9. The system was moving northeastward at 10–15 km/h.
Forecast for the next 24 hours indicates that by 01:00 on 27 August, the system will be located at approximately 23.1°N and 110.7°E, over southeastern Guangxi Province (China), weakening into a low-pressure area with winds below Force 6 while continuing northeastward at about 15 km/h. The disaster risk level remains Level 3 for the eastern Gulf of Tonkin.
2. Strong Winds, High Waves and Thunderstorms at Sea
During 26 August, the eastern part of the northern Gulf of Tonkin is expected to experience winds of Force 6–7 with gusts up to Force 9 and waves of 2–4 meters. The southern part of the northern East Sea (including the Hoang Sa/Paracel Islands), the central East Sea, the northern part of the southern East Sea (including the northern Truong Sa/Spratly Islands), and coastal waters from Gia Lai to Ho Chi Minh City may experience southwest winds of Force 6, gusting to Force 7–8, with waves of 2–4 meters.
Thunderstorms are forecast across the Gulf of Tonkin and several offshore areas, with risks of waterspouts, strong gusts and waves exceeding 2 meters. The marine disaster risk level is Level 2, while the eastern northern Gulf of Tonkin remains at Level 3.
3. Rainfall Situation
From 19:00 on 24 August to 19:00 on 25 August, northern and north-central Viet Nam recorded heavy to very heavy rainfall, generally ranging from 50–80 mm, with some stations exceeding 100 mm.
From 19:00 on 25 August to 07:00 on 26 August, scattered rainfall continued across northern Viet Nam, with several locations recording more than 80 mm.
Accumulated rainfall from 19:00 on 20 August to 07:00 on 26 August reached 150–400 mm across northern and north-central provinces, with exceptionally high totals recorded at Mau Son (712 mm), Bai Chay (700 mm), Bach Long Vi (574 mm), Ha Lang (526 mm), Tan Hoa (489 mm), Cam Dan (454 mm), Truc Phuong (433 mm) and Tinh Gia (427 mm).
Rainfall is expected to continue on 26 August, with widespread totals of 15–30 mm and isolated locations exceeding 80 mm. Thunderstorms may be accompanied by tornadoes, lightning, hail and strong winds. The disaster risk level associated with thunderstorms, lightning and hail is Level 1.
Floodwaters on the Cau, Luc Nam and Thuong rivers in Bac Ninh Province are receding slowly. Water levels on the Cau and Thuong rivers remain between Alert Levels 2 and 3, while the Luc Nam River remains above Alert Level 1. Floodwaters on the Buoi River in Thanh Hoa are receding but remain above Alert Level 2, while upper reaches of the Ca River in Nghe An remain above Alert Level 1.
As of 07:00 on 26 August, water levels on several rivers remained above warning thresholds, including the Thuong River at Huu Lung and Cau Son stations and the Luc Nam River at Luc Nam station. Forecasts indicate that floodwaters will continue to recede, although some rivers in Lang Son and downstream sections of the Thuong River will remain above warning levels.
Between 22 and 25 August, a total of 50 dyke incidents were recorded. Forty incidents occurred on Grade III to special-grade dykes in Bac Ninh, Hung Yen, Hai Phong, Ha Noi and Ninh Binh. Another ten incidents occurred on lower-grade dykes in Phu Tho, Bac Ninh, Quang Ninh and Thanh Hoa.
Under the direction of the Ministry of Agriculture and Environment and guidance from the Vietnam Disaster and Dyke Management Authority (VDDMA), local authorities have promptly addressed and stabilized most incidents while maintaining close monitoring.
The Prime Minister issued Official Dispatches No. 57/CD-TTg and No. 54/CD-TTg directing northern provinces, provinces from Thanh Hoa to Quang Tri, and relevant ministries to proactively respond to heavy rainfall, flash floods and landslides while accelerating recovery efforts.
The National Civil Defense Steering Committee, the Ministry of Agriculture and Environment, and various ministries including National Defense, Public Security, Construction, Education and Training, Science and Technology, and Industry and Trade issued directives and mobilized resources for disaster response.
The Ministry of Agriculture and Environment and VDDMA deployed field missions to flood-affected areas, inspected dyke systems, issued technical guidance and maintained 24/7 monitoring and forecasting operations.
As of 17:00 on 25 August, a total of 7,751 households had been evacuated. Of these, 4,560 households had already returned home, while 3,191 households remained in safe evacuation shelters, including in Lang Son, Bac Ninh, Quang Ninh, Ha Noi, Phu Tho, Cao Bang and Thai Nguyen. Water levels are gradually receding and local authorities are assisting residents in returning home safely.
According to reports from affected provinces and Vietnam Electricity (EVN), Typhoon No. 4 and the associated heavy rainfall caused the following impacts:
