A mobile weather-observation vehicle recorded surface temperatures approaching 50 °C at Gwanghwamun Square in Seoul on Tuesday [1].
These measurements highlight the severity of the current heat wave and the dangerous impact of the urban heat-island effect in South Korea's capital. While official air temperature readings provide a general sense of the weather, surface temperatures on pavement and asphalt can reach far more hazardous levels for pedestrians and city infrastructure.
Reporter Kim Min-kyung and a crew from YTN partnered with the Korea Meteorological Administration to map the city's heat in real time around noon on Aug. 4 [1]. The team utilized a specialized vehicle to produce a heat map of downtown Seoul, identifying specific hotspots where heat is trapped by concrete and steel.
During the survey, the team found that surface temperatures at Gwanghwamun Square reached nearly 50 °C [1]. The data also revealed extreme volatility in temperature across the urban landscape. In some instances, the road surface temperature differed by more than 20 °C between sites located only a few kilometers apart [1].
"Seoul is literally in a heat wave emergency," a YTN anchor said [1].
Kim Min-kyung said that the surface temperature at Gwanghwamun Square approached 50 degrees [1]. She also said that road surface temperatures varied by more than 20 degrees even when the locations were only a few kilometers apart [1].
The disparity in temperatures suggests that urban planning, such as the presence of green spaces or water bodies, significantly alters the local climate within a single city. The high surface temperatures recorded on Tuesday underscore the risks of heat exhaustion for those navigating the city's most paved districts.
“"Seoul is literally in a heat wave emergency"”
The extreme variance in surface temperatures across short distances demonstrates the 'urban heat-island effect,' where dense concentrations of pavement and buildings absorb and radiate heat. This creates localized danger zones that may not be reflected in standard meteorological reports, necessitating more granular urban cooling strategies to protect public health during heat waves.
