Extreme rainfall struck the southern coast of South Gyeongsang Province overnight, triggering emergency disaster text messages for disaster-level heavy rain [1].
These weather events pose immediate risks of flooding and landslides in coastal regions, forcing the government to issue urgent warnings to residents to ensure public safety.
Geoje city experienced the most severe impact. At approximately 03:00 KST, the city recorded an extreme hourly rainfall of 116.8 mm [1]. Over a two-day period, the cumulative rainfall in Geoje reached 809.8 mm [2].
Nearby areas also faced significant precipitation. Tongyeong recorded a two-day cumulative rainfall of 678.2 mm [2]. The Korea Meteorological Administration has maintained heavy-rain warnings for Geoje, Tongyeong, and Goseong county [1].
Meteorologists said the storm was caused by a concentrated cloud band and a strong low-level jet stream that brought abundant moisture to the region [1]. The Korea Meteorological Administration forecast that the southern coast of Gyeongsangnam-do could receive more than 100 mm of additional rainfall [1].
Other parts of the country are expecting lighter precipitation today. The capital region, including Seoul, is forecast to receive between five and 20 mm [1]. Daegu and North Gyeongsang are expected to see between five and 40 mm [1].
YTN reporter Jang Ah-young said the extreme rain in Geoje occurred early in the morning while cumulative totals surpassed 800 mm [1].
“Geoje recorded an extreme hourly rainfall of 116.8 mm”
The intensity of this rainfall—specifically the hourly rate in Geoje—indicates a high-velocity weather event capable of overwhelming urban drainage systems. The combination of a strong low-level jet stream and concentrated cloud bands suggests an atmospheric setup that can cause localized, extreme flooding even while other regions, like Seoul, experience minimal rain.
