South Korean authorities activated the first stage of the Central Disaster and Safety Countermeasures Headquarters early Monday morning to manage severe flooding and rescue stranded residents as relentless downpours battered the country's southern coast, according to government reports.
The emergency mobilization, launched at 6 a.m. on August 17, 2026, focused heavily on the coastal cities of Geoje and Tongyeong within South Gyeongsang Province. Officials deployed emergency teams after torrential rains resulted in localized inundations, trapping approximately 20 residents in areas such as Hoejin village in Geoje.
Meteorological data highlighted the extreme intensity of the weather system. Cumulative rainfall totals recorded between August 15 and the morning of August 17 reached 782.5 mm in Geoje, 628.9 mm in Tongyeong, and 428.5 mm in Gangseo, Busan. Peak hourly precipitation reached 124.5 mm in Geoje, exceeding thresholds that standard urban drainage systems can safely manage.
The Ministry of the Interior and Safety raised severe-rain and landslide risk alerts to the "Caution" level as forecasts indicated that heavy precipitation would persist throughout the day, particularly across southern regions and near Mount Jirisan. Regional projections called for additional rainfall totals between 50 mm and 150 mm in Busan, Ulsan, and South Gyeongsang, alongside 30 mm to 80 mm in Jeju.
Prior to Monday's escalation, national damage reports documented widespread disruptions. Authorities recorded 135 heavy-rain damage incidents nationwide by August 16, encompassing 77 cases of flooded homes, yards, and underground parking lots, alongside 50 road-flooding events and multiple fallen trees.
While the heavy rainfall provided short-term relief to localized agricultural drought conditions in parts of Gyeongnam, the rapid transition into high-volume flash flooding prompted heightened vigilance from emergency management personnel. Rescue operations remain ongoing in isolated pockets along the southern coast as municipal and national agencies monitor rising water levels.
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