Schools and offices across nearly all of Taiwan's 22 counties and cities were closed on Friday as Typhoon Champi approached, with authorities urging residents to stay away from coasts and mountains. The storm has so far killed one person, who was swept away by waves, and injured 171 others, with about 1,000 people evacuated, authorities said.
Champi was packing wind gusts of 191km/h (119mph) on Friday afternoon. At its peak earlier this week, the storm reached maximum sustained wind speeds of 185mph (298km/h) over the Philippine Sea, the equivalent of a Category 5 hurricane, making it the planet's strongest storm of the year so far.
While weather agencies in Taiwan, Hong Kong and Japan forecast that the eye of the storm is expected to pass without making landfall, a forecaster at Taiwan's Central Weather Administration told Reuters that this could not be ruled out completely, especially if the storm "stalls, loops or wobbles from side to side" as it approaches.
The storm is expected to bring up to 90cm (35in) of rain and strong winds to Taiwan's north-east until Saturday. Rainfall is forecast to peak on Saturday morning and continue into the evening, the Central Weather Administration said.
Taiwan's $5tn stock exchange was closed on Friday because of the severe weather. Only Kinmen county, an archipelago west of Taiwan's main island, continued work and classes as usual.
In Japan, power cuts affected nearly 8,400 households in the southern Okinawa prefecture, according to the local power company. More than 160 flights have been cancelled across four Japanese airlines.
The storm also stirred heavy rains and winds in Batanes, a Philippine island chain south of Taiwan, where local government Facebook posts showed waves crashing into seaside villages and roads closed to traffic. There were no immediate reports of casualties there.
Champi is the latest in a string of intense typhoons driven by an unusually strong El Niño, a naturally occurring phenomenon that heats the Pacific Ocean and fuels storms. It is Japan's 30th typhoon of the year, the first time since 2013 the country has seen so many storms.