Packing gusts of up to 180 kilometres per hour, the typhoon could hit the southern main island of Kyushu as early as tomorrow, before moving east along the Japanese archipelago, the national weather agency said.
Officials said Neoguri would bring torrential rainfall and warned of the risk of flooding and landslides after the storm -- which has already weakened from a super typhoon -- forced half a million people to seek shelter in Okinawa yesterday.
Kyushu -- situated next to the biggest island of Honshu, where major cities including Tokyo and Osaka are located -- was already experiencing heavy rain and strong winds, and authorities were likely to issue an emergency alert for residents to seek shelter ahead of Neoguri's landfall.
On Monday, officials issued their highest typhoon alert for Okinawa, warning that Neoguri -- which means raccoon in Korean -- could turn deadly.
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Today, the weather agency's chief forecaster Satoshi Ebihara said the situation in Okinawa remained serious even as the typhoon moved out to sea, with the agency issuing a fresh rainfall alert.
"It would be no surprise if this unprecedented torrential rainfall triggers a serious disaster with landslides and flooding," he said.
In the Okinawan capital of Naha yesterday, traffic lights went out, trees were split, signboards flew about and a restaurant was destroyed.
Dozens were injured across the sprawling archipelago. The coast guard and local police said a 62-year-old man was found dead after he was knocked off his boat in rough waters near Japan's mainland, while public broadcaster NHK said an 81-year-old fisherman died in southwestern Kumamoto prefecture.