Authorities issued the first emergency heavy-rain disaster text message of the year to residents in Seoul and surrounding areas on Saturday [1].

The sudden surge in precipitation threatens urban infrastructure and public safety in one of the world's most densely populated metropolitan areas. Heavy rain can lead to rapid flash flooding in low-lying districts, disrupting transit and endangering commuters.

Heavy rain warnings are currently in effect for Seoul, northern Gyeonggi, and northwestern Gangwon [3]. Additional rain advisories cover southern Gyeonggi, Chungnam, and most other regions of Gangwon [3]. The alerts follow a strong rain-cloud system that has settled over the capital region and Gangwon, producing extreme precipitation [1].

In several specific districts, including Seodaemun, Yangcheon, Guro, and Eunpyeong in Seoul, as well as Bupyeong in Incheon and Bucheon in Gyeonggi, rainfall has exceeded 50mm per hour [3]. Some locations are expected to see hourly rainfall reach up to 80mm [2].

"As heavy rain concentrates in the capital area, the first emergency disaster text message for heavy rain this year was sent to Seoul," a YTN anchor said [3].

Forecasters expect the intense weather to continue through Saturday morning and persist into the following day [3]. Total rainfall is projected to exceed 300mm by tomorrow [2].

Reporter Kim Min-kyung said that rain warnings remain active for Seoul and northern Gyeonggi, while advisories are in place for southern Gyeonggi and Chungnam [3].

“Total rainfall is projected to exceed 300mm by tomorrow.”

The issuance of an emergency text alert indicates that the rainfall intensity has surpassed standard weather warnings and entered a threshold of immediate public danger. With forecasts predicting over 300mm of total rain, the Seoul metropolitan area faces a significant risk of urban flooding, which often occurs when drainage systems are overwhelmed by hourly rates exceeding 50mm.