Thunderstorms are expected across the country ahead of Chuseok or Korean Thanksgiving.
The storms began on Tuesday night and will continue in some parts till midday on Wednesday.
Some 50-100 mm of rains will fall throughout the country between Tuesday evening and midnight Thursday. Over 150 mm of rain is expected in Seoul, Gyeonggi Province, the northern part of South Chungcheong Province, Gangwon Province, the west coast, the south coast, and areas near Mt. Jiri, the Korea Meteorological Administration predicted.
The reason is that hot and humid air from the southwest is meeting cold air over the Korean Peninsula, weatherman Cho Ku-hee said.
It will stop raining in Jeju first on late Wednesday afternoon. The rain will unlikely affect people's travel to their ancestral hometowns for the Chuseok holidays this weekend, the KMA predicted.