Record-level flooding struck South Korea's southern coast after three days of extreme rainfall concentrated in Gyeongsangnam-do [1].
The disparity in weather patterns across the peninsula highlights an increasing trend of localized, extreme precipitation events that overwhelm regional infrastructure while other areas remain dry.
Cities including Geoje and Tongyeong experienced the brunt of the storm. Approximately 1,000 mm of rain fell in just three days [1]. This volume represents about 90% of the total rainfall expected for the entire summer season [1].
While the south faced devastation, the Seoul metropolitan area and the surrounding central region remained largely unaffected. These areas experienced hot, humid weather with only scattered showers. This divergence occurred because a concentrated rain system stalled over the southern coast, while high-pressure, humid air over the central region limited precipitation [1].
Kong Hang-jin, a YTN disaster advisory member, said nearly 1,000 mm of rain fell in three days. He said that for some areas, this event represented more than 80% of the typical annual rainfall occurring all at once [1].
Local officials in Gyeongsangnam-do are currently assessing the damage to coastal infrastructure. News anchors said the intensity of the rainfall was record-breaking, leaving significant flood damage across the southern coastal belt [1].
“Roughly 90% of the season's expected rainfall fell in three days in Gyeongsangnam-do.”
The extreme concentration of seasonal rainfall into a 72-hour window suggests a shift toward more volatile weather patterns in East Asia. When nearly an entire season's worth of water falls in three days, traditional drainage and flood prevention systems are often bypassed, increasing the risk of flash floods and landslides regardless of historical averages.
