On the 20th, rain and strong winds are expected nationwide. The country will be mostly cloudy that day, with rain falling nationwide through the evening. In the capital area, central regions, and northern and central North Gyeongsang, rain will continue until late at night. In the Gangwon mountains and along the East Sea coast, rain will continue through the morning of the 21st.
In areas where it rains, gusty winds and thunder and lightning may accompany the rain, so people should take care to prevent safety accidents and manage facilities to prepare for rain-related damage.
Expected rainfall: Seoul, Incheon, and Gyeonggi 30∼80 mm; Gangwon mountains and the East Sea coast 50∼200 mm; inland Gangwon 30∼80 mm; Daejeon, Sejong, South Chungcheong, and North Chungcheong 20∼60 mm; Gwangju, South Jeolla, and North Jeolla 5∼20 mm; Daegu and North Gyeongsang 30∼80 mm; Busan, Ulsan, and South Gyeongsang 20∼80 mm; the five islands in the Yellow Sea 5∼40 mm; and Jeju Island 5∼80 mm.
Along the South and North Jeolla coasts, the South Gyeongsang coast, and Jeju Island (except the north), where a strong wind advisory is in effect, strong winds with instantaneous speeds around 70 km/h are expected through the afternoon. From the afternoon, there is a possibility that a strong wind advisory will also be issued for the East Sea coast of Gangwon. Strong winds with instantaneous speeds around 55 km/h are also expected in other areas.
Daytime highs are forecast at 22∼30 C, similar to average years.
Waves will run 1.0–5.0 m off the East Sea, 0.5–3.0 m off the Yellow Sea, and 1.0–3.0 m off the South Sea. In offshore waters within about 200 km of the coastline, wave heights are expected at 1.0–5.5 m in the East Sea, 1.0–3.5 m in the Yellow Sea, and 1.5–3.5 m in the South Sea.