On Monday the 12th, extra caution will be needed for the morning commute as the snow and rain that fell across most of the country over the weekend freeze. With snow or rain expected again mainly along the South Chungcheong west coast, there is a possibility that precipitation will expand to the Seoul, Incheon and Gyeonggi west coast in the morning and to all of the central region except the east coast in the afternoon.
On the 12th, morning lows will drop to between minus 14 and minus 3, and strong winds will make it feel even colder. Cold wave advisories are in effect for inland northern Gyeonggi and inland and mountainous Gangwon, central and northern North Chungcheong, Gyeryong in South Chungcheong, eastern North Jeolla, and inland northeastern North Gyeongsang and mountainous areas. Daytime highs will be 0 to 10, higher than average.
Forecast lows and highs for major cities are minus 9 and 3 in Seoul; minus 8 and 5 in Incheon and Daejeon; minus 4 and 7 in Gwangju; minus 8 and 6 in Daegu; minus 6 and 7 in Ulsan; and minus 4 and 8 in Busan.
Earlier over the weekend, heavy snow fell mainly in inland and mountainous Gangwon, Honam, and Jeju. As of 4 p.m. on the 11th, snowfall totals were 32.3 cm at Sajaebi on Hallasan in Jeju, 25.4 cm at Hyangnobong in Goseong County, Gangwon, 21.0 cm at Seolcheonbong in Muju County, North Jeolla, 16.8 cm in Unnam-myeon, Muan County, South Jeolla, and 15.4 cm in Mokpo.
In Honam, the South Chungcheong west coast, northern inland South Chungcheong, central North Chungcheong, and southern North Chungcheong, precipitation will continue as snow or rain on the evening of the 11th, and in Jeju through the early morning of the 12th. Additional expected snowfall is 2–7 cm in the South Jeolla west coast, North Jeolla west coast, and Jeju mountains; 1–5 cm in the South Chungcheong west coast, Gwangju, western South Jeolla (excluding the west coast), and Ulleungdo and Dokdo; around 1–3 cm in mid-mountain Jeju; and around 1 cm in Sejong, northern inland South Chungcheong, central North Chungcheong, southern North Chungcheong, inland North Jeolla, and coastal Jeju.
In these areas, temperatures will drop sharply overnight, refreezing snow that melted during the day and making roads slippery. There is a high chance of thin, hard-to-see ice, known as "black ice," forming in spots.
High seas warnings are in effect for all waters. Strong winds and high waves will continue through the 11th in the West Sea and the front waters of the southwestern South Sea (excluding the western outer waters of the southwestern South Sea) and off Ulsan; through the 12th in the front waters of the East Sea (excluding off Ulsan), around Jeju, and the western outer waters of the southwestern South Sea; and through the 13th in the eastern outer waters of the South Sea. In the outer East Sea, strong winds of 35–65 kph (9–18 m/s) and waves of 1.5–4.0 meters are expected for the time being.
In particular, wave heights may exceed 5.0 meters in the eastern outer South Sea, the outer East Sea, and the southern outer waters off Jeju, requiring extra caution during navigation or fishing.