The Korea Meteorological Administration announced at 5 pm on the 3rd that it will issue a heavy rain warning throughout Seoul. Heavy rain warning is issued when the rainfall for 3 hours is 60 mm or more, or when the rainfall for 12 hours is predicted to be 110 mm or more. The amount of rainfall is such that even if you use an umbrella, you will get wet with the rain. There is a possibility that valleys and rivers will overflow and evacuation orders will be issued. In addition, at Jeju International Airport, delayed flights are occurring one after another. Because of the strong wind. Looking at the aviation information portal system of the Ministry of Land, Infrastructure, Transport and Tourism (equivalent to the Ministry of Land, Infrastructure, Transport and Tourism), a total of 46 flights, including 23 flights departing from Jeju and 23 flights arriving at 4:00 pm on the 3rd, were delayed, the Union News reported. At Jeju Airport, a sudden gust warning was issued at 10:36 am on that day. A strong wind warning was also added from 2:00 pm. It was found that a strong southeasterly wind and southerly wind crossed Mt. Halla and a gust phenomenon occurred at and around the airport.