Heavy rain is intensifying across the Seoul metropolitan area, Gangwon Province, and northern Chungnam on Thursday night [1, 2].
The sudden increase in precipitation threatens to cause significant flooding and infrastructure damage in northern Gyeonggi and Gangwon, where totals are expected to climb rapidly.
Weather officials said that moisture-laden cloud bands are moving back into the region, bringing renewed precipitation [1, 2]. Current hourly precipitation rates are measured at 10-20 mm [1], though some specific areas including Yeoncheon, Paju, Pocheon, and Cheorwon have reported rates around 40 mm per hour [4].
"Rain is falling now, centered on Chungnam, the metropolitan area, and Gangwon, as rain clouds flow back in," reporter Kim Min-kyung said [1].
Forecasters said that hourly peaks could reach up to 50 mm [2]. The most severe impact is anticipated in northern Gyeonggi and northern Gangwon, where total rainfall is projected to exceed 200 mm overnight [2].
"Damage is feared as more than 200 mm of rain is expected to fall in northern Gyeonggi and northern Gangwon," an anchor said [2].
The weather pattern is expected to persist through the early hours of Friday, July 10, maintaining high volumes of water in the north-western zones [2, 3]. Local authorities are monitoring the situation as the intensity of the storms fluctuates across the affected provinces.
“Total rainfall is projected to exceed 200 mm overnight in northern Gyeonggi and northern Gangwon.”
The concentration of over 200 mm of rain in a short window—particularly with hourly peaks of 50 mm—places extreme stress on urban drainage systems and rural slopes. Because the rain is concentrated in the northern metropolitan and mountainous regions, there is an increased risk of flash floods and landslides that could disrupt transport links between Seoul and the northeast.
