Typhoon Jangmi is moving through the waters south of Japan, bringing high temperatures and heavy rainfall to the Korean Peninsula [1].
Although the storm is not expected to make a direct landfall in South Korea, its presence is disrupting regional weather patterns. The system is pulling vast amounts of water vapor toward the peninsula while simultaneously pushing hot, dry air westward, creating a volatile mix of heatwaves and torrential rain.
The Korea Meteorological Administration (KMA) said the strongly developed typhoon moved toward the sea south of Japan overnight and will not have a direct impact on the country [5]. However, the KMA said that easterly winds crossing mountain ranges are pushing high-temperature, dry air westward, which will significantly raise temperatures in Seoul and other western regions for the time being [6].
Inland areas have already seen daytime highs reach approximately 33°C [2]. This sudden spike in temperature coincides with heavy precipitation in the south. The KMA said that Jeju Island and the southern coast are expected to receive significant rainfall, with Jeju's mountainous regions potentially seeing more than 120mm [3]. The southern coast is projected to receive more than 80mm of rain [4].
Authorities are also monitoring the potential for the first sea-based typhoon special weather warning of the season [2]. The KMA continues to track the storm's trajectory to determine if these warnings will be formally issued as the system interacts with the peninsula's atmospheric conditions.
Residents in the southern coastal regions and those in the western interior are advised to monitor local weather updates as the storm's indirect influence persists.
“Jeju Island and the southern coast are expected to receive significant rainfall, with Jeju's mountainous regions potentially seeing more than 120mm.”
This situation demonstrates how a tropical cyclone does not need to make landfall to cause severe weather disruptions. By altering pressure systems and wind directions, Typhoon Jangmi is acting as a catalyst for both a heatwave in the west and flooding in the south, complicating emergency management across different climatic zones of the peninsula simultaneously.
