Vietnam has evacuated over 586,000 residents as Typhoon Kajiki approaches, with landfall expected near Vinh on Monday.
The storm, which intensified into a typhoon on August 23 in the South China Sea, has brought sustained winds exceeding 100mph (160km/h).
In response, authorities have canceled boats and flights to mitigate risks.
China’s Hainan province issued a red alert, its highest warning level, as Kajiki passed south of the island.
The typhoon is forecast to deliver over 300mm (11.8in) of rainfall to Hainan and Vietnam, raising concerns about severe flooding, particularly in agricultural areas.
By Tuesday, Kajiki is expected to weaken rapidly as it moves inland across Vietnam and Laos, losing the warm sea fuel it requires.
In the western Pacific, Hurricane Erin, though 200 miles from the U.S. coast, generated waves up to 50ft, impacting beaches and flooding homes.
As a post-tropical cyclone with 90mph winds, Erin is expected to stall northwest of Britain, with minimal impact on western Europe.
However, its swells will produce hazardous conditions, with waves exceeding 20ft at surfing spots like Mullaghmore, Ireland, and Nazaré, Portugal, on Tuesday.