An extreme rainstorm delivered roughly four times the forecasted precipitation to Geoje city and South Gyeongsang Province over three days [2].
The event is significant because it represents one of the most intense non-typhoon rain events ever recorded in the region, challenging existing infrastructure and weather forecasting models.
The precipitation accounted for approximately 90% of the region's typical summer rainfall [1]. Experts said the storm was a once-in-200-years occurrence [2]. The heavy rains occurred during the Gwangbokjeol holiday weekend, impacting residents along the southern coast [1].
Professor Baek Seung-ju said the event ranks third in historical records, with the top two spots held by Typhoon Rusa in 2002 [1]. He said this is the highest record since official tracking began for non-typhoon situations [1].
The intensity of the storm was driven by a rare meteorological pattern that produced an unusually high volume of precipitation [2]. While official weather records for Seoul date back to 1907, records for Geoje only span about 50 years [2]. This shorter data window makes the 200-year estimate a critical benchmark for regional planning.
Local residents faced sudden flooding as the rain far exceeded expectations. Anchor Cho Tae-hyun said heavy rain poured over the southern coast during the holiday weekend [1].
“The event is comparable to a once-in-200-years rain occurrence.”
The occurrence of a 200-year rain event outside of a typhoon system suggests a shift in regional weather patterns. Because Geoje has only 50 years of official data, the reliance on statistical modeling for 'once-in-a-century' events highlights the difficulty of predicting extreme weather in areas with shorter meteorological records.
