The Korea Meteorological Administration forecasts extreme rainfall across central South Korea starting early Tuesday, July 14, 2026 [1, 2].
These weather conditions pose a significant risk of infrastructure damage and flooding in densely populated areas. The timing of the storm follows a period of intense heat, creating a volatile transition in weather patterns for millions of residents.
The forecast focuses on the Seoul metropolitan area, Gangwon Province, and the Chungcheong region [1, 2]. According to the agency, moisture from the remnants of Typhoon Bavi is moving northward into the Korean Peninsula, fueling the system [2].
Rainfall intensity is expected to be severe. Some reports indicate hourly rainfall could reach 80 mm [1], while other data from the agency suggests maximum rainfall could reach 120 mm or more [2]. This volatility in precipitation levels increases the likelihood of flash floods and landslides in mountainous terrain.
Wind speeds are also expected to rise, with forecasts predicting gusts of 20 m/s or more [2]. Local authorities have already begun monitoring high-risk zones. Earlier this week, a heavy rain advisory was issued for Boryeong in South Chungcheong Province as strong rains began to hit the coast [2].
Weather officials warned that the transition from extreme heat to heavy rain is particularly dangerous. "With extreme heat raging across the country, heavy rain and gusts are now the emergency concern starting tomorrow," Jung Hye-yoon said [2].
The agency noted that the monsoon rains, which had briefly subsided, are returning with significant force. An anchor for YTN said the coming weekend would likely be the critical period for the weather system [2].
Emergency services are urging residents in the central regions to secure loose outdoor objects, and avoid unnecessary travel during the peak of the storm to prevent casualties from the predicted wind and water levels.
“Hourly rainfall could reach 80 mm, while other data suggests maximum rainfall could reach 120 mm or more.”
The convergence of Typhoon Bavi's remnants with the existing monsoon season creates a high-risk scenario for South Korea's central infrastructure. When rainfall exceeds 80 mm per hour, urban drainage systems in cities like Seoul often reach capacity, leading to rapid street flooding. The combination of high wind speeds and extreme precipitation increases the risk of power outages and landslides, necessitating a high state of alert for emergency management agencies.
