The Korea Meteorological Administration has issued a heavy-rain advisory for the Seoul metropolitan area and Gangwon Province through July 11 [1].
These forecasts signal a high risk of flash flooding and infrastructure strain in densely populated urban centers and mountainous regions. The timing of the heaviest rain, expected overnight on July 10, increases the danger for commuters and residents in vulnerable areas [1, 2].
Weather officials said a thin cloud band moving in from the West Sea is bringing moisture that is intensifying the rainfall [1, 2]. This system is currently impacting southern Gyeonggi and southern Gangwon, where hourly rainfall rates are between 10 and 20 mm [1].
In some areas, the intensity could spike significantly during the overnight hours. Meteorologists said hourly rates could reach up to 50 mm [1]. The most severe precipitation is expected in northern Gyeonggi and northern Gangwon, where total rainfall may reach 200 mm or more by tomorrow [1].
Other areas under the advisory include northern Chungnam [1, 2]. The Korea Meteorological Administration continues to monitor the movement of the cloud band as it pushes further inland [2].
Reporter Kim Min-kyung said that rain clouds are re-entering the region, contributing to the current hourly rates of 10 to 20 mm in southern Gyeonggi and southern Gangwon [1].
“Total rainfall may reach 200 mm or more by tomorrow”
The concentration of heavy rainfall in the Seoul metropolitan area and northern provinces creates a critical window for emergency management. With potential hourly rates of 50 mm, the volume of water can quickly exceed the capacity of urban drainage systems, leading to rapid street flooding and potential landslides in the rugged terrain of Gangwon Province.
