Heavy-rain warnings were issued Monday morning for the Seoul metropolitan area and northern central regions of South Korea [1, 2].

The alerts come as a stationary front triggers intense localized precipitation, raising the risk of flash flooding and the inundation of low-lying urban areas [1, 2]. Authorities said that the weather could lead to significant traffic accidents during the morning commute [1].

Weather officials designated several high-risk zones, including western Seoul, Incheon, northern Gyeonggi province, and Cheorwon in Gangwon province [1]. In Incheon, rainfall was recorded at approximately 20 mm per hour [2]. In some other locations, hourly rainfall intensity is expected to reach up to 50 mm [2].

Forecasts indicate that total rainfall could reach 100 mm [1]. The combination of high intensity and volume increases the likelihood of drainage systems becoming overwhelmed in densely populated districts.

Safety officials are urging motorists to exercise extreme caution. A YTN weather reporter said, "As there are concerns about traffic accidents on the way to work, please maintain a generous distance between vehicles and drive slowly" [1].

The warnings extend beyond the capital to include northern Gangwon Province and the northern Chungnam West Coast [1, 2]. Residents in these areas are advised to monitor local weather updates as the stationary front continues to move through the region.

“Total rainfall forecast up to 100 mm”

The issuance of heavy-rain warnings for the Seoul metropolitan area highlights the vulnerability of South Korea's urban infrastructure to stationary fronts. When rainfall exceeds 50 mm per hour, municipal drainage systems often struggle to keep pace, turning low-lying roads into temporary waterways and creating hazardous conditions for the millions of commuters in the capital region.