The typhoon's eye at 7 a.m. Sunday was located at 70 kilometers east-northeast of China's Hainan Island and around 420 kilometers from Quang Ninh, which borders China and is home to Ha Long Bay, according to Vietnam's National Center for Hydrometeorological Forecasting.

Forecast of Typhoon Matmo's movement.

Its maximum sustained winds were of 149 kilometers per hour, gusting up to 167-183 kph. It was moving at a speed of 25 kph.

Matmo has strengthened from 118-133 kph winds on Saturday night on and has likely reached its peak intensity. It is expected to gradually decline in strength.

By 4 p.m. Sunday, it is forecast to move west of the Leizhou Peninsula (China), about 250 km from Quang Ninh, with maximum winds reduced to 133 kph.

By 4 a.m. Monday, the storm is expected to be near the coastline of Quang Ninh–Hai Phong, with sustained winds at 75-88 kph.

Matmo will likely move inland through Quang Ninh, cross the Vietnam–China border, and weaken into a tropical depression.

The meteorological agencies of Japan and Hong Kong have a similar assessment, stating that Matmo’s winds are currently around 126 kph, expected to strengthen to 144 kph while passing over China’s Leizhou Peninsula, then move into the Vietnam–China border area with winds at 108 kph.

Due to the storm’s influence, the northwestern part of the northern East Sea will see winds increasing from 62 to 149 kph, wave heights of 4–8 meters.

From Sunday afternoon, the eastern area of the northern Gulf of Tonkin will experience winds increasing from 39 to 88 kph. By Sunday night, the northern Gulf of Tonkin will experience winds rising from 62 to 117 kph, with waves 2–5 meters high.

Coastal regions and offshore islands in Quang Ninh–Hai Phong may experience storm surges rising 0.4–0.6 meters.

Vietnam’s meteorological agency warned that marine and coastal conditions during the storm will be "extremely dangerous and unsafe for any vessel or structure operating."

All vessels and floating platforms are at high risk of capsizing or being destroyed, with strong winds, high waves, and storm surges likely to cause flooding.

From Sunday night, the coastal areas of Quang Ninh to Hung Yen will see winds strengthening from 39 - 88 kph. Further inland, in the northeast, winds will be at 20 - 49 kph.

From Sunday night to Tuesday night, mountainous and midland provinces in northern Vietnam are expected to receive 150–250 millimeters of rain, locally exceeding 400 mm.

The Red River Delta and Thanh Hoa Province will receive 70–150 mm, locally over 200 mm. Hanoi is unlikely to be affected by strong winds, but rainfall starting early Monday could reach 70–120 mm, locally over 150 mm.

To respond to the storm, Hai Phong and Hung Yen authorities have banned all sea operations at 5 p.m. Saturday.

Quang Ninh suspended fishing vessel licenses before noon Sunday and halted all tourism and accommodation activities at sea from 8 a.m. Ninh Binh imposed its sea ban at 6 a.m.

Deputy Prime Minister Tran Hong Ha on Saturday signed an official directive requiring northern and north-central provinces, together with relevant ministries, to recognize the extreme danger of Typhoon Matmo in the context of ongoing recovery from Typhoon Bualoi, in order to implement prompt and effective response measures.

Provincial People’s Committee chairs, particularly in coastal provinces from Quang Ninh to Ninh Binh, are directed to ensure safety for fishing vessels, coastal and island activities, and operations in inland areas; to review and be ready for evacuation plans, and to implement rescue and relief work in case of emergencies.

Authorities in northern and north-central provinces, especially those in mountainous and midland regions, are instructed to deploy comprehensive measures for dealing with floods, flash floods, inundation, mudslides, and landslides according to their assigned functions, responsibilities, and authority, ensuring that emergency response teams are deployed in critical areas.

Lao Cai Province specifically is to inspect and immediately evacuate households in hazardous areas at risk of landslides, particularly in Bao Ha Commune.

Matmo is the 11th storm in the East Sea this year. The most recent was Typhoon Bualoi, which made landfall between Nghe An and northern Quang Tri on Sept. 29, causing floods and tornadoes from Thua Thien Hue northward.

Storm Bualoi to enter East Sea after midnight, expected to grow stronger

Storm Bualoi is forecast to cross the central Philippines into the East Sea (South China Sea) after midnight on Saturday and re-intensify, packing winds of 118–149 kph as it approaches north-central Vietnam.

Storm Ragasa forecast to become super typhoon with 201 kph winds before entering East Sea

Storm Ragasa is intensifying and is forecast to strengthen into a super typhoon with peak winds of 201 kph over the next two days, before moving into the East Sea.

Storm Mitag to hit China Friday, set to bring heavy rains to northern Vietnam

Storm Mitag is forecast to make landfall in southern Guangdong, China, on Friday evening with sustained winds of 62–88 kph, before bringing widespread rain and thunderstorms to northern Vietnam next week.

Tropical depression likely to strengthen into storm off Vietnam coast today

A tropical depression formed in the northeastern part of the East Sea on Friday evening and is forecast to strengthen into a storm by Saturday, according to the National Center for Hydro-Meteorological Forecasting.

Storm Nongfa weakens into tropical depression

Storm Nongfa weakened into a tropical depression and rolled into the mainland between central Ha Tinh and Quang Tri provinces on Saturday afternoon, according to the National Center for Hydro-Meteorological Forecasting.