Flash floods, heavy rain and landslides triggered by Typhoon Hagupit have killed at least 32 people in Vietnam.
Authorities report that homes have been washed away and farmland swamped by the raging storm, which has already struck China and the Philippines.
Vietnamese soldiers were dispatched to evacuate people in vulnerable areas.
The damage comes as a separate typhoon, the season’s most powerful, batters Taiwan with winds of up to 209km/h (130mph), cancelling flights.
Hagupit, which means “lashing” in Filipino, killed at least eight people in the Philippines and at least 17 in China where it triggered a huge storm tide.
There are fears of more flooding and landslides in the mountainous provinces of Son La, Lang Son and Bac Giang and flooding fears along the Thai Binh river, the National Meteorology Centre said.
The Red River near the capital Hanoi was expected to reach dangerously high levels on Sunday, rising to 8.6 metres (28 ft), the centre said.
In Taiwan, Typhoon Jangmi hit mid-day Sunday, triggering evacuations and more than 100 landslides.
Taiwan’s high-speed trains were suspended, while the island’s two major ports, in Keelung and Kaohsiung, were shut down until further notice.
Jangmi is a category four typhoon on a 1-5 scale and was expected to weaken after passing over Taiwan.
The storm is moving northwest and is expected to make landfall again over a large swathe of coastal China by Monday, before changing course toward Japan.