On the morning of Saturday, the 21st, the Korea Meteorological Administration forecasts that, while the weather will generally be clear throughout the country, there will be dense fog mainly in the Chungcheong and Jeolla regions. Visibility in these areas may drop below 200 meters, which raises concerns for transportation safety. The temperatures are predicted to range from -2 to 6 degrees Celsius in the morning, with a high of 11 to 15 degrees during the day.

The weather agency advises caution, particularly on roads near coastal bridges and inland rivers, lakes, or valleys, where fog might be even denser. As the day progresses, the eastern coast of Gangwon and parts of North Gyeongsang are expected to see drying conditions, increasing fire risks. The agency highlights the necessity for enhanced fire precautions due to the drying atmosphere and potential for strong winds.

This weather forecast has implications particularly for public events, such as the anticipated BTS performance that day, where clear skies would enhance the experience for attendees. The fog warnings serve as a reminder for individuals traveling in affected areas to exercise caution, especially given the high-profile nature of activities planned, which could attract significant crowds and traffic.