Vietnam’s National Centre for Hydro-Meteorological Forecasting is warning of a prolonged spell of heavy rain across the central coast, with the most intense cumulative totals expected in Hue, Da Nang and eastern Quang Ngai. A warning issued on November 7 was reaffirmed in the centre’s latest bulletin, released at 3:30 a.m. on November 9: the three areas could receive 250–450 millimetres between November 9 and the night of November 11, while isolated locations may exceed 700 mm. The figures are forecasts, not rainfall already recorded.
A warning updated as the rain moves south
The November 7 warning set out the broad threat across central Vietnam, but the forecast has since become more detailed as the weather system develops. In its 3:30 a.m. bulletin on November 9, the National Centre for Hydro-Meteorological Forecasting said the rain focus would shift south from the northern part of the central region. It forecast heavy to very heavy rain from southern Quang Tri to Da Nang and eastern Quang Ngai through November 10, followed by another period of heavy rain on November 11.
That update did not remove the headline cumulative risk. The agency retained a total of 250–450 mm for Hue, Da Nang and eastern Quang Ngai from November 9 through the night of November 11, with isolated locations potentially exceeding 700 mm. It also forecast 150–300 mm in southern Quang Tri and eastern parts of Gia Lai and Dak Lak, with local totals above 400 mm. The separate time windows matter: daily forecast amounts and three-day accumulations describe different parts of the same event.
Sources: TIN DỰ BÁO MƯA LỚN Ở KHU VỰC TỪ PHÍA NAM TỈNH NGHỆ AN ĐẾN THÀNH PHỐ ĐÀ NẴNG VÀ PHÍA ĐÔNG CÁC TỈNH TỪ QUẢNG NGÃI ĐẾN ĐẮK LẮK · Proactive response to heavy rain, floods, inundation, flash floods, and landslides in the Central region. · Central region braces for torrential rain from November 8 · Prolonged rain triggers flood, landslide alerts in Central region
Where the heaviest rainfall is expected
The latest bulletin divides the episode into stages. From November 9 to the night of November 10, southern Quang Tri, Da Nang and eastern Quang Ngai are expected to receive 150–250 mm, with isolated areas above 500 mm. On November 11, Hue, Da Nang and eastern Quang Ngai could receive a further 100–200 mm, with local totals above 300 mm. Across the full November 9–11 period, the accumulated forecast for the three main areas remains 250–450 mm, locally more than 700 mm.
The agency also warned that rainfall could exceed 100 mm in three hours in some places. Such short-duration intensity can matter as much as the multi-day total: water may run rapidly off steep ground, overwhelm drainage in built-up areas and raise smaller streams before larger rivers reach their peaks. The forecast includes thunderstorms, with possible lightning, hail, whirlwinds and strong gusts. NCHMF classified the heavy-rain hazard at Level 1, while still identifying several serious local impacts that authorities need to prepare for.
Sources: TIN DỰ BÁO MƯA LỚN Ở KHU VỰC TỪ PHÍA NAM TỈNH NGHỆ AN ĐẾN THÀNH PHỐ ĐÀ NẴNG VÀ PHÍA ĐÔNG CÁC TỈNH TỪ QUẢNG NGÃI ĐẾN ĐẮK LẮK · Central region braces for torrential rain from November 8 · Prolonged rain triggers flood, landslide alerts in Central region
River levels are forecast to rise, not yet reported as flooding
The hydrological warning covers rivers from Quang Tri to Dak Lak between November 9 and 12. In its bulletin issued at 3:30 p.m. on November 8, the forecasting centre said water levels were changing slowly and remained below Alert Level 1 at that time. It forecast a flood wave during the following four days, with rivers in Hue potentially reaching Alert Level 2 or higher. Rivers in southern Quang Tri, Da Nang and Quang Ngai were expected to reach Alert Levels 1–2, with some locations possibly exceeding Level 2.
The forecast for the Gianh River in Quang Tri and rivers in eastern Gia Lai and eastern Dak Lak was around Alert Level 1. NCHMF warned of possible inundation in low-lying riverside areas and urban centres, as well as flash floods on small streams and landslides on slopes. These are projected hazards, not confirmation that those impacts have occurred. The November 8 bulletin explicitly described river levels as below the first alert threshold before the forecast flood wave.
Sources: TIN DỰ BÁO MƯA LỚN Ở KHU VỰC TỪ PHÍA NAM TỈNH NGHỆ AN ĐẾN THÀNH PHỐ ĐÀ NẴNG VÀ PHÍA ĐÔNG CÁC TỈNH TỪ QUẢNG NGÃI ĐẾN ĐẮK LẮK · TIN CẢNH BÁO LŨ TRÊN CÁC SÔNG TỪ QUẢNG TRỊ ĐẾN ĐẮK LẮK · Central region braces for torrential rain from November 8 · Prolonged rain triggers flood, landslide alerts in Central region
High waves add a maritime risk
The rain warning is not the only weather concern. In a separate marine bulletin issued at 4 a.m. on November 9, NCHMF forecast northeasterly winds of force 7, at times force 8, with gusts reaching force 9–10 over the northern East Sea, including the Hoang Sa archipelago. Waves were forecast at 4–6 metres, with rough to very rough seas. The same bulletin expected 3–5 metre waves in the northern part of the central East Sea and waters from southern Quang Tri to Quang Ngai.
The agency said strong winds and high waves could endanger vessels, while showers and thunderstorms in several sea areas could bring waterspouts and additional gusts. For coastal communities, ports and fishing operators, this creates a separate operational problem from rainfall on land: conditions offshore may deteriorate even where local rain totals are lower. The marine warning was classified at disaster-risk Level 2. It should not be confused with the Level 1 classification attached to the heavy-rain warning.
Sources: TIN DỰ BÁO GIÓ MẠNH, SÓNG LỚN VÀ MƯA DÔNG TRÊN BIỂN
Rescue teams, evacuation plans and reservoir operations
The government’s Official Dispatch No. 73/CĐ-TTg, signed on November 7 by Deputy Prime Minister Ho Quoc Dung, directed authorities in Nghe An, Ha Tinh, Quang Tri, Hue, Da Nang, Quang Ngai, Gia Lai and Dak Lak to prepare for the forecast period. It called for reviews of flood-response plans and the pre-positioning of personnel, vehicles, equipment and supplies in locations vulnerable to deep flooding, landslides or isolation. Local authorities were told to organise evacuations from dangerous areas when needed, with particular attention to older people, children and other vulnerable residents.
The dispatch also tasked the Ministry of Agriculture and Environment, working with the Ministry of Industry and Trade, with calculating reservoir-regulation options and supporting the operation of irrigation and hydropower reservoirs. The stated aims include dam safety, downstream flood control and water management ahead of a dry season in which El Niño-related water shortages are a concern. Separately, the Ministry of Public Security ordered police units in the affected provinces and cities to remain on duty, prepare rescue equipment and coordinate support for evacuations, traffic control and emergency response.
Sources: Proactive response to heavy rain, floods, inundation, flash floods, and landslides in the Central region. · Lực lượng Công an nhân dân chủ động ứng phó với mưa lớn, lũ, ngập lụt, lũ quét, sạt lở đất tại khu vực Trung Bộ · PM orders central Vietnam to prepare for floods, landslides
What the forecast can—and cannot—tell residents
The weather agency has linked the episode to a cold air mass moving south and interacting with warmer air over central Vietnam, a pattern expected to sustain widespread downpours through November 11. NCHMF said the heavy rain should begin to ease from November 12. But local rainfall can vary sharply over short distances, especially where thunderstorms form, so the forecast ranges should not be read as a guarantee that every district will receive the same amount or that every river will reach its projected level.
As of the November 9 morning forecast, the central warning remains a forward-looking assessment. The official bulletins do not establish that the predicted 700 mm has fallen, that widespread flooding has occurred, or that casualties have been recorded. Those questions require later observations and local situation reports. The next useful checks are updated NCHMF rainfall and river bulletins, reservoir-operation notices, and district-level announcements on evacuations, school arrangements and road access. Any confirmed flooding or loss of life would be a separate development requiring a fresh report.
Sources: TIN DỰ BÁO MƯA LỚN Ở KHU VỰC TỪ PHÍA NAM TỈNH NGHỆ AN ĐẾN THÀNH PHỐ ĐÀ NẴNG VÀ PHÍA ĐÔNG CÁC TỈNH TỪ QUẢNG NGÃI ĐẾN ĐẮK LẮK · TIN CẢNH BÁO LŨ TRÊN CÁC SÔNG TỪ QUẢNG TRỊ ĐẾN ĐẮK LẮK · TIN DỰ BÁO GIÓ MẠNH, SÓNG LỚN VÀ MƯA DÔNG TRÊN BIỂN · Proactive response to heavy rain, floods, inundation, flash floods, and landslides in the Central region. · Prolonged rain triggers flood, landslide alerts in Central region
