The National Center for Hydro-Meteorological Forecasting said that 10 hours after entering the East Sea (South China Sea), Bualoi maintained its track and intensity.

The predicted trajectory of Typhoon Bualoi.

At 4 a.m. Saturday, the storm was about 580 km east-southeast of the Hoang Sa (Paracel) archipelago, packing maximum sustained winds of 133 kph and moving west-northwest at 35–40 kph.

Fueled by warm seas and moving at roughly twice the average storm speed, Bualoi continues to intensify. By 4 a.m.

Sunday, its center is expected over the western waters of Hoang Sa, about 180 km east of Da Nang, with top winds of 118–149 kph and a west-northwesterly track of 30–35 kph.

By 4 a.m. Monday, the storm's center is projected over the Ha Tinh–Hue waters, about 160 km north of Quang Tri, still at 118–149 kph, before making landfall along the Nghe An–Quang Tri coast.

Forecasters warn the fast-moving, wide-impact storm could trigger multiple hazards: destructive winds, torrential rain, river flooding, flash floods, landslides, and coastal inundation.

From Saturday evening, seas from Thanh Hoa to Quang Ngai (including Hon Ngu, Con Co, and Ly Son islands) will see winds rising from 39–49 kph to 75–88 kph, with waves 3–5 m high. By Sunday morning, winds may reach 149 kph and waves of 5–7 m.

From Sunday morning, the northern Gulf of Tonkin (including Bach Long Vi, Van Don, Co To, Cat Hai, and Hon Dau islands) will see winds increasing to 88 kph, with 3–5 m waves.

Coastal areas and islands from Ninh Binh to Ha Tinh face storm surges of 1–2 m; Thanh Hoa and Nghe An could see 1.5–2 m. Elevated sea levels and high waves from Sunday evening pose a high risk of flooding along dikes, coastal roads, and river mouths.

On land, from Sunday afternoon, areas from Thanh Hoa to northern Quang Tri will see winds strengthening from 39–49 kph to 118–133 kph.

From Sunday through Tuesday, northern and central Vietnam, up to Hue, are forecast to receive 100–300 mm of rain, locally over 400 mm. The Red River Delta (including Hanoi) and Thanh Hoa–Ha Tinh may see 200–400 mm, with isolated totals above 600 mm.