Typhoon Dolphin battered southern Japan on Saturday, injuring at least six people, disrupting air travel and leaving more than 50,000 buildings without electricity as China prepared for the powerful storm to reach its eastern coastline.

Authorities said five elderly people were injured in Okinawa, including three who fell because of strong winds. Another person was injured in Kagoshima prefecture. None of the injuries was considered life-threatening.

Power outages affected nearly 39,000 buildings in Kagoshima and more than 12,000 in Okinawa as severe winds swept across the region.

Major Japanese carriers ANA and Japan Airlines canceled flights to and from Okinawa because of dangerous weather conditions.

Typhoon Dolphin was carrying maximum sustained winds of about 162 kilometers per hour, or 90 mph, with gusts reaching as high as 216 kph.

Okinawa and the Amami Islands in Kagoshima prefecture were expected to bear the brunt of the storm in Japan.

China prepares for typhoon landfall

Meanwhile, authorities in China shut ports and suspended ferry services as they prepared for Dolphin to make landfall between late Sunday and early Monday.

Chinese officials classified the storm under an orange typhoon warning, the country’s second-highest alert level.

Authorities also raised the emergency response for the storm to Level III amid growing concerns about flooding, landslides and other weather-related disasters.

China’s National Meteorological Center said Dolphin was most likely to make landfall somewhere between Zhoushan in Zhejiang province and Fuding in Fujian province.

Forecasters expect winds near the storm’s center to reach between 38 and 45 meters per second, equivalent to roughly 85 to 101 mph.

China’s National Marine Forecasting Center maintained its highest red alert for dangerous waves on Saturday, predicting waves between five and eight meters—about 16 to 26 feet—in coastal waters off Zhejiang through Sunday afternoon.

An orange-level warning was also in effect for waters off Shanghai and northern Fujian, where waves could reach between three and 5.5 meters.

Heavy rainfall threatens eastern China

The storm is expected to bring intense rainfall and powerful winds across eastern China through August 12, affecting Shanghai and several surrounding provinces.

Some areas of eastern Zhejiang could receive more than 600 millimeters, or nearly 24 inches, of rainfall, according to weather forecasters.

Authorities have warned residents to prepare for possible flash flooding, landslides and transportation disruptions as Typhoon Dolphin approaches the coast.