Stagnant Front Moves North to Seoul Metropolitan Area; Heavy Rain Expected in Central Regions Overnight

Heavy rain is a major concern for the Seoul metropolitan area and other central regions overnight tonight, July 17.

The stagnant front, which remained over the Chungcheong region today, will gradually move north toward the Seoul metropolitan area overnight. A mesoscale low-pressure system, the primary driver of this heavy rainfall, is also expected to develop and pass through the metropolitan area during the night.

Furthermore, strong low-level winds are expected to develop into a low-level jet stream at night, fueling the formation of heavy rain clouds over the central regions.

As the aforementioned mesoscale low-pressure system passes through the Seoul metropolitan area early tomorrow morning, very intense rainfall—indicated in red on the map—is expected to concentrate in the central regions between early morning and noon, with rates of 50 to 80 mm per hour.

This level of rainfall is intense enough to trigger emergency disaster text alerts.

Please ensure thorough preparations are made in advance.

The projected rainfall amounts are as follows: up to 300 mm or more in the Seoul metropolitan area and Gangwon Province, up to 250 mm or more in northern Chungcheong, around 150 mm in southern Chungcheong and northern North Gyeongsang, and up to 120 mm or more in western North Jeolla.

Preliminary heavy rain advisories have been issued for the central regions, where intense rain is expected starting early tomorrow morning. In the southern regions, the rain is expected to intensify starting tomorrow night as the stagnant front moves southward.

With the rain falling tomorrow, the heat will subside, particularly in the central regions.

Seoul's daytime high will remain at 26°C (79°F).

The stagnant front is expected to remain over the Korean Peninsula through next week, causing intermittent periods of rain.

(Weather Forecaster Nam Yu-jin)
※ Please note: This article was translated by AI and may contain errors.