Surface temperatures in Seoul reached nearly 50°C on Tuesday as a severe heat wave gripped the South Korean capital [1].
These measurements highlight the extreme variance in urban heat distribution, illustrating how concrete infrastructure exacerbates temperature spikes compared to natural green spaces.
Reporter Kim Min-kyung of YTN used a Korea Meteorological Administration (KMA) weather-observation vehicle to map the city's surface heat around noon on Aug. 4 [1]. The vehicle recorded data at one-second intervals to create a precise heat map of the urban environment [1].
At Gwanghwamun Square, the ground temperature approached 50°C [1]. "The surface temperature approached 50 degrees," Kim said [1].
In contrast, the mobile unit found cooler conditions at a Namsan walking trail, where the surface temperature dropped to 33.6°C [1]. "On the Namsan walking trail, the surface temperature dropped to 33.6 degrees," Kim said [1].
The two measurement sites are located only two to three kilometers apart [1]. Despite this proximity, the temperature difference between the urban square and the forested trail exceeded 20°C [1].
Local officials have issued a public health warning as the city faces a critical heat emergency. An unnamed YTN anchor said, "Seoul is literally in a heat wave emergency" [1].
“"The surface temperature approached 50 degrees,"”
The stark contrast between Gwanghwamun Square and Namsan trail demonstrates the 'urban heat island' effect, where dense concentrations of pavement and buildings absorb and radiate more heat than vegetated areas. A 20°C variance over just a few kilometers indicates that urban planning and the preservation of green corridors are critical for public health during extreme weather events.
