I. Weather and Disaster Situation

Tropical Depression

On the evening of 13 September, the tropical depression weakened into a low-pressure area over western Quang Tri Province. The system is forecast to move further inland toward central Laos on 14 September, where it will continue to weaken and dissipate.

Rainfall

From 19:00 on 12 September to 19:00 on 13 September, heavy to very heavy rainfall was recorded across central Viet Nam. Quang Tri Province and Hue City received widespread rainfall of 150–300 mm, while Ha Tinh Province and Da Nang City recorded 50–100 mm. The highest observed rainfall included 480 mm at Ta Long (Quang Tri), 397 mm at Ba Nang (Quang Tri), 396 mm at Ta Luong (Hue), and 376 mm at Rao Trang 3 Hydropower Reservoir (Hue).

During the night of 13–14 September, moderate to heavy rainfall continued in provinces from Ninh Binh to Quang Tri, as well as Hung Yen and Lao Cai, with some stations recording more than 200 mm.

Cumulative rainfall from 10–14 September reached 400–600 mm in Quang Tri Province and Hue City, with exceptionally high totals such as 1,308 mm at Bach Ma Peak (Hue), 834 mm at Ta Long (Quang Tri), and 768 mm at Nham (Hue).

Forecast and Warning

From early 14 September through 15 September, heavy to very heavy rain and thunderstorms are forecast across the southern Red River Delta and the area from Thanh Hoa to northern Ha Tinh, with widespread rainfall of 150–300 mm and isolated totals exceeding 450 mm. Other parts of the northern delta and adjacent provinces may receive 100–180 mm, with localized amounts above 250 mm.

On 16 September, moderate to heavy rain is expected to continue in parts of northern Viet Nam and north-central provinces. The disaster risk level for heavy rain, thunderstorms, lightning and hail is Level 1, rising to Level 2 in Nghe An Province and northern Ha Tinh Province.

River Floods

River levels in Quang Tri and Hue are generally receding, while rivers in Ha Tinh are rising but remain below Alert Level 1. The Thach Han River peaked at 6.39 m on the evening of 13 September, exceeding Alert Level 3 by 0.39 m before beginning to fall.

Flooding is forecast to continue on rivers from Thanh Hoa to Hue through 16 September. Water levels on the Ngan Sau and Ngan Pho rivers in Ha Tinh may reach Alert Levels 2–3, while most other rivers are expected to fluctuate around Alert Levels 1–2. The flood disaster risk level remains at Level 1–2.

II. Reservoir Situation

Water levels at the major reservoirs in the Red River basin remain within operational limits. As of 07:00 on 14 September, Son La Reservoir was at 211.20 m, Hoa Binh at 109.64 m, Tuyen Quang at 116.11 m, and Thac Ba at 55.03 m.

Several hydropower reservoirs in the North Central and Central Highlands regions are releasing water through spillways, including La Trong Reservoir with a discharge of 726 m³/s and Se San 4 Reservoir with a discharge of 224 m³/s.

Most irrigation reservoirs nationwide remain at 42–93% of their design storage capacity.

III. Response Measures

The National Civil Defence Steering Committee issued directives and emergency dispatches on 11–12 September requesting ministries, sectors and local authorities to proactively respond to the tropical depression, heavy rain, floods, flash floods, landslides and severe weather.

The Viet Nam Disaster and Dyke Management Authority (VDDMA), under the Ministry of Agriculture and Environment (MAE), coordinated with Zalo Viet Nam to disseminate safety guidance related to the tropical depression, flash floods and landslides to approximately 22 million mobile subscribers in affected areas.

Local authorities have activated emergency operations, monitored weather developments, guided vessels to safety, organized evacuations, and implemented traffic control measures in flooded and landslide-prone areas.

IV. Reported Impacts (as of 06:00, 14 September)

According to initial reports from Quang Tri, Hue, Da Nang and Quang Ngai:

• 9 houses were damaged (5 in Quang Tri and 4 in Hue).

• 591 houses were flooded in Quang Tri.

• 712 households were evacuated to safe locations, including 663 households in Quang Tri.

• Flooding disrupted traffic at 19 locations on national and provincial roads.

• Fifty-five low-water crossings, overflow bridges and rural roads were inundated, causing localized isolation.

• Approximately 991 hectares of rice and crops were damaged, including 347 ha in Quang Tri, 581 ha in Da Nang and 63 ha in Quang Ngai.

At around 14:00 on 13 September, three barges were swept downstream by floodwaters on the O Giang River and became lodged near the My Chanh railway bridge in Quang Tri Province, posing risks to railway, road and inland waterway infrastructure. Provincial authorities promptly deployed response measures and prepared equipment for salvage operations.

V. Key Priorities

Authorities at all levels are requested to continue implementing national directives on flood preparedness and response; monitor river levels closely; strengthen warnings for communities in flood-prone, low-lying and landslide-risk areas; control traffic at inundated crossings and bridges; and organize evacuations where necessary.

All ministries, sectors and localities are maintaining 24/7 duty operations and reporting regularly to the Ministry of Agriculture and Environment through the VDDMA.