Extreme heavy rain struck central South Korea overnight between July 17 and 18, triggering emergency rain-disaster messages in major cities [1].
The severity of the downpour has raised immediate concerns regarding urban flooding and infrastructure stability in densely populated regions. Because the rainfall exceeded critical safety thresholds, authorities issued urgent warnings to residents to avoid flood-prone areas.
In Daegu's Suseong-gu Jisan-dong, the region recorded 89 mm of rain in a single hour [1]. This volume represents the strongest "water bomb" seen so far this year, Yu Da-hyun said [1]. The South Korean Meteorological Administration classifies rainfall of 70 mm per hour as extreme heavy rain [1].
For context, meteorological standards indicate that 30 mm per hour creates difficulty for vehicle wipers, while 50 mm per hour typically leads to flooding [1]. The 89 mm recorded in Daegu far exceeded these markers, prompting the first emergency rain-disaster text message of the year for that area [1].
Seoul also experienced significant rainfall during the night, leading to the city's first emergency rain-disaster alert of the year [1]. An anchor for YTN News said the central region, specifically Seoul, saw the strongest rain of the year during the overnight period [1].
The weather system has not yet fully dissipated. The Meteorological Administration forecasts that more than 100 mm of additional rain will fall by tomorrow [1]. Local officials continue to monitor river levels, and drainage systems as the storm persists across the central provinces.
“89 mm of rain in a single hour”
The issuance of 'extreme heavy rain' alerts in both the capital and Daegu indicates a severe weather pattern that exceeds standard urban drainage capacities. With an additional 100 mm of rain forecast, the risk of landslides and flash floods remains high, potentially disrupting transportation and commerce across central South Korea.
