South Korea has issued its first offshore typhoon warning of the year for the eastern South Sea as Typhoon Jangmi moves toward Japan [1].

This sudden shift in weather patterns creates a dangerous duality across the peninsula, combining high-intensity flooding in the south with an extreme heat wave in the capital region. The disparate conditions highlight the volatile atmospheric influence of the current typhoon system.

A heavy-rain warning is currently active for Jeju Island and the Namhae coast [1]. According to YTN caster Won Ida, these areas are experiencing concentrated rainfall of approximately 30 mm per hour [1]. The moisture fueling these storms is being drawn from Typhoon Jangmi as it tracks toward Japan [1].

While the south faces flooding, the Seoul metropolitan area and other west-central regions are experiencing a surge in temperature. A southeasterly wind is pushing unusually hot air into the region, which is expected to result in the highest temperatures of the year so far [1].

Seoul's morning temperature was recorded at 17.7 °C [2]. However, midday forecasts predict the city will reach 33 °C [1]. Similarly, Chuncheon is expected to see temperatures climb to 32 °C [1].

Won Ida said, "Today, the west-central region, including the capital area, is expected to have the highest heat of the year due to the influence of the southeasterly wind."

The Korea Meteorological Administration continues to monitor the offshore eastern South Sea, where the first typhoon warning of the year remains in effect [1]. Local authorities have warned residents in the Namhae and Jeju regions to remain vigilant as the hourly rainfall persists [1].

Won Ida said, "Currently, while a 'heavy rain advisory' is in effect for the southern coast of Jeonnam and Jeju Island, strong rain of around 30mm per hour is concentrated."

“South Korea has issued its first offshore typhoon warning of the year for the eastern South Sea.”

The simultaneous occurrence of a typhoon warning in the south and a record heat wave in the north demonstrates how tropical cyclones can disrupt regional climates far beyond their immediate center. By steering moisture toward the coast and pushing hot air toward the interior, Typhoon Jangmi is creating a high-stress environment for South Korea's infrastructure, requiring the government to manage both flood mitigation and heat-related public health risks at once.