This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: A joint research team from KAIST and the APEC Climate Center has found that the East Asian summer front has migrated north over the past half century, with the shift exceeding 200 km (124 miles) in late summer. This raises the risk that the Korean Peninsula will experience heavy rain and heat stress at the same time.
The findings suggest that summer disaster planning should address flood prevention and heat-illness management together, through late September. A research team led by Professor Hyungjun Kim from the Department of AI and Futures Studies, who is also director of the KAIST Institute for Climate, Environment and Energy, has identified the long-term northward migration of the East Asian summer front and the resulting increase in compound risk. The team conducted the study with Dr.
OkYeon Kim from the APEC Climate Center (APCC) by analyzing 47 years (1979 to 2025) of high-resolution reanalysis data. The study is published in npj Climate and Atmospheric Science. Frontal precipitation accounts for about 40% of total summer precipitation in East Asia, and for about half in June and September.
A front forms along the boundary between contrasting air masses, where temperature and moisture change sharply. The summer of 2024 illustrates what is at stake: Gunsan recorded an hourly rainfall of 131.7 mm (5.19 inches), the highest on record, and more than 600 mm (24 inches) of rain fell over the Seoul metropolitan area in two days, while prolonged heat waves occurred during the same period. The position of the front has received relatively little attention.
Previous research has mainly examined changes in the intensity of frontal precipitation under global warming, and the research team also showed in earlier work that this intensity has increased. However, even a small shift in the position of a front can substantially change regional precipitation patterns and determine which communities face flooding and which swelter in the heat. The team applied an automated front-detection algorithm to ERA5, a high-resolution (about 25 km [16 miles]) reanalysis dataset from the European Center for Medium-Range Weather Forecasts (ECMWF), and tracked the position of the front every six hours over the 47 years.
After confirming that the detected fronts agreed well with front positions on weather maps, they found that throughout the summer, the front in the most recent period (2006 to 2025) was located farther north than in the earlier period (1979 to 1998). The front moved north by about 213 km (132 miles) in late summer (Sept. 10 to 30), compared with an average of about 146 km (91 miles) during the active frontal season (June 25 to July 15). In the earlier period, the late-summer front was located over the Yangtze River basin and the sea south of Jeju Island.
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