South Korea's president has called on authorities to do their utmost as the country braces for a powerful typhoon expected to make landfall early Tuesday.
Weather officials said on Monday that Typhoon Hinnamnor is moving north-northeast over the East China Sea.
It is expected to pass near Jeju Island off the country's southern coast before making landfall near the second largest city of Busan Tuesday morning.
Some roads in Jeju are reportedly flooded, as the island resort has been pounded by extremely heavy rains of more than 50 millimeters per hour since Sunday.
Public broadcaster KBS is airing footage of waves gradually becoming higher as they slam into the island's shoreline.
South Korean media say more than 300 airline flights have been cancelled. Elementary and junior high schools in Seoul will be either closed on Tuesday or classes will take place online.
President Yoon Suk-yeol on Monday instructed disaster control officials to take the initiative by implementing any measures they deem necessary.
Yoon said the government will remain alert and make every effort to guarantee the people's safety.
Last month record rains pelted Seoul and its surrounding areas, killing 14, including a family of three living in a semi-basement flat.