Heavy rain will fall across southern regions and Jeju Special Self-Governing Province on Saturday the 24th. Drivers and residents in Jeonnam, Gyeongnam and Jeju should take particular care, as those areas are set to receive heavy rainfall between the previous day and the 25th.
Rain began in southern regions and Jeju on the 23rd, with light showers of less than 0.1 mm expected in southern Chungcheong during the night, the Korea Meteorological Administration said. On the 24th, rain will fall in parts of the eastern coast and mountainous areas of southern Gangwon State from morning to afternoon, and in the southeastern part of South Chungcheong Province and the central and southern parts of North Chungcheong Province in the afternoon.
Cumulative rainfall from the 23rd to the 25th is forecast at about 5 mm for the eastern coast and mountains of southern Gangwon on the 24th; 5 to 10 mm for Gangwon's eastern coast and mountains on the 25th; 5 to 10 mm for Daejeon, southeastern South Chungcheong and central and southern North Chungcheong on the 24th; about 5 mm for Daejeon, Sejong, South Chungcheong and North Chungcheong on the 25th; 20 to 60 mm for Gwangju and Jeonnam, with more than 80 mm in places along Jeonnam's southern coast; 5 to 50 mm for southeastern Jeonbuk State; 5 to 30 mm for the rest of Jeonbuk State; 30 to 80 mm for Busan, Ulsan and South Gyeongsang Province, with more than 100 mm in places along the southern coasts of Busan, Ulsan and South Gyeongsang; 20 to 60 mm for Daegu and southern North Gyeongsang Province; 5 to 40 mm for central and northern North Gyeongsang and the islands of Ulleungdo and Dokdo on the 24th and 25th; and 80 to 150 mm for Jeju, with more than 200 mm in parts of the southern and eastern areas and more than 250 mm in the mountains and mid-slope areas.
Morning lows will range from 8 to 17 degrees Celsius, with daytime highs of 16 to 21 degrees. Expected morning lows in major cities are 13 degrees in Seoul, 14 in Incheon, 10 in Chuncheon, 13 in Gangneung, 13 in Daejeon, 14 in Daegu, 14 in Jeonju, 14 in Gwangju, 17 in Busan and 19 in Jeju. Daytime highs are forecast at 21 degrees in Seoul, 21 in Incheon, 20 in Chuncheon, 20 in Gangneung, 19 in Daejeon, 19 in Daegu, 20 in Jeonju, 19 in Gwangju, 19 in Busan and 22 in Jeju.
Strong winds will whip up high waves in some areas. From before dawn, winds will blow very strongly at 30 to 65 kilometers per hour, or 8 to 18 meters per second, in the far seas of the western South Sea, the waters off northern Jeju and the inner far seas of the eastern South Sea, requiring care in managing facilities and ensuring safety. Waves will run 0.5 to 1.5 meters high in coastal waters of the East Sea, West Sea and South Sea. In the inner far seas, defined as waters within about 200 kilometers of the coastline, waves are expected to reach 0.5 to 3.0 meters in the East Sea and West Sea and 1.0 to 3.5 meters in the South Sea.
High swells will surge onto beaches or wash over rocky shores and breakwaters along the eastern coast through the morning and along the southern coast and Jeju's shores for some time, so people should avoid approaching the waterfront.
Moisture carried by Typhoon Champi, now moving northwest over waters near Taiwan, is expected to meet cold air over Korea. At a regular briefing on the 22nd, the Korea Meteorological Administration said moisture brought in by Typhoon Champi and a subtropical high-pressure system was one of the causes of the rain. Champi, currently moving northwest over waters southeast of Taiwan, is forecast to change course around the 24th and come closest to the seas off southern Korea and Jeju on the 25th. Uncertainty remains over the typhoon's path and the rainfall outlook, raising the possibility that the rain could last either a shorter or a longer period than initially expected.