Seoul recorded its first tropical night of the season as extreme heat warnings were issued across South Korea this week [1].
The sudden surge in temperature threatens public health and infrastructure, signaling an early and intense start to the summer heat cycle. Residents in major cities are facing a combination of oppressive daytime highs and nights where temperatures fail to drop, increasing the risk of heat-related illnesses.
Weather officials reported that the minimum overnight temperature in Seoul reached 25°C [1]. This threshold marks the official beginning of tropical nights for the capital. Meanwhile, other regions experienced even more severe conditions. In Gyeongju, North Gyeongsang Province, the temperature climbed to 37.4°C, the highest official record for the day [2].
Some unofficial measurements indicated even higher peaks. In Hayang-eup, Gyeongsan, North Gyeongsang Province, an unofficial high of 39.9°C was recorded [1]. Heat wave warnings are currently active in several regions, including Gyeongsangbuk-do, Gyeongsangnam-do, Daegu, Gwangju, Jeonnam, and Busan [1, 2].
Meteorologists attribute the extreme weather to a "heat dome" effect. This phenomenon occurs when the Tibetan High pressure system overlaps with the North Pacific High, trapping hot air over the region [1, 3]. The situation is further exacerbated by the influx of southwesterly winds, which bring hot and humid air into the peninsula [1, 3].
"The momentum of the heat wave is becoming increasingly severe," a YTN News anchor said [2].
Forecasters expect these high temperatures to persist through the middle of this week [1]. Local authorities have urged citizens to remain hydrated and avoid outdoor activities during peak heat hours to prevent heatstroke.
“Seoul recorded its first tropical night of the season as extreme heat warnings were issued across South Korea.”
The emergence of a heat dome, where two high-pressure systems stack, creates a atmospheric lid that prevents heat from escaping. When this is combined with humid southwesterly winds, it creates a dangerous environment where the body cannot cool itself effectively through sweat. The early arrival of tropical nights in Seoul suggests a volatile summer pattern that may strain the national power grid due to increased air conditioning demand.
