On Friday the 20th, the country will be mostly clear, but temperature swings will widen, especially in inland areas.
The Korea Meteorological Administration said, "Until tomorrow morning (the 20th), temperatures will be similar to the seasonal average and will be higher than average from the afternoon," adding, "Through the day after tomorrow (the 21st), the difference between daytime and nighttime temperatures will be large, mainly in inland areas nationwide."
Morning lows are forecast at -7 to 4 degrees, with afternoon highs at 10 to 16 degrees. In particular, morning temperatures in most regions nationwide will be at or below 0, and strong winds will make it feel even colder.
By contrast, daytime temperatures will rise above 10 degrees in most regions, bringing mild conditions at midday. The Korea Meteorological Administration urged caution to prevent safety accidents, as ice on rivers and lakes may melt.
The country will be mostly clear, but the Seoul metropolitan area and Gangwon Province will see periods of many clouds.
With dry weather warnings in effect for eastern South Jeolla, the Gyeongsang region, and parts of southern North Chungcheong, the air will be very dry in those areas, requiring extra caution to prevent wildfires and other fires.
Fine dust levels are expected to be "bad" in the Seoul metropolitan area (excluding Incheon) and Yeongseo in Gangwon due to stagnant air, and "moderate" elsewhere.
Incheon and the Chungcheong region will temporarily see "bad" levels at night due to inflows of overseas fine dust and the formation of fine dust through chemical reactions of domestic and overseas air pollutants.