At 2:00 a.m., the water level on the Luc Nam River at Luc Nam Station reached 7.01 meters, exceeding Warning Level 3 by 0.71 meters. On the Thuong River at Phu Lang Thuong Station, the water level measured 6.36 meters, 0.06 meters above Warning Level 3. Meanwhile, the Cau River at Dap Cau Station reached 5.02 meters, approaching Warning Level 2.

Forecasts indicate that over the next 6–12 hours, water levels on the lower reaches of the Luc Nam and Thuong rivers will continue to rise and remain above Warning Level 3, while the lower Cau River is expected to exceed Warning Level 2. During the following 12–24 hours, flood levels on the Thuong and Luc Nam rivers are projected to continue increasing above Warning Level 3, whereas the Cau River is expected to approach but remain below Warning Level 3.

During August 24–25, flood levels across river systems in Lang Son, Bac Ninh, Cao Bang, and Thai Nguyen provinces are expected to remain high. Peak water levels on the Cau, Thuong, and Luc Nam rivers in Bac Ninh, as well as the Trung, Ky Cung, and Bac Giang rivers in Lang Son Province, are forecast to fluctuate between Warning Levels 2 and 3, with some locations exceeding Warning Level 3. Other river basins, including the Bang Giang River in Cao Bang Province and the Thai Binh River at Pha Lai in Hai Phong City, may reach Warning Levels 1–2.

The meteorological authority has issued a Level 3 natural disaster risk warning for flooding and warned of widespread inundation in low-lying and riverside areas within affected communes and wards. Prolonged heavy rainfall is also increasing the risk of flash floods along small rivers and streams, as well as landslides on steep slopes in Quang Ninh, Lang Son, Bac Ninh, Cao Bang, and Thai Nguyen provinces.

A table showing observed and forecast water levels for the next 24 hours has been released.

In response to the complex developments associated with Storm No. 4 and the ongoing heavy rainfall, Bac Ninh Province has proactively implemented comprehensive local response measures. As of 3:00 p.m. on August 23, no casualties had been reported. However, the disaster has caused significant impacts on infrastructure, agriculture, and local livelihoods.

In the agricultural sector, heavy rainfall caused localized flooding across more than 8,300 hectares of rice, crops, fruit trees, and forestry land. The most severely affected areas include over 3,900 hectares of rice fields and more than 3,790 hectares of fruit orchards. In the livestock and aquaculture sectors, authorities safely relocated 180 head of livestock and more than 9,100 poultry. Approximately 8.5 hectares of aquaculture ponds were affected, although no livestock or poultry losses have been reported.

Regarding residential areas and infrastructure, floodwaters caused the collapse of a roof on one house in Lang Giang Commune. A total of 184 households were evacuated to safer locations, while 330 households in Nam Duong were forced to move their belongings due to deep flooding. An erosion site was recorded at Km 6+000 along the Lang Son secondary dike in Tan An Ward. Eight pumping stations were inundated, and the Tan Chung transformer station in An Lac Commune was submerged by half its height, prompting power authorities to implement localized electricity cuts to ensure safety. Across the province, 71 low-water crossings were flooded and 52 embankment slope failures were recorded along national and provincial roads. Major industrial parks and urban areas in the province remain safe and have not experienced flooding.