The Korea Meteorological Administration (KMA) issued heavy rain warnings for Jeju and the southern coasts of South Korea on July 1, 2024 [1].

These weather alerts signal the official start of the monsoon season, bringing significant risks of flooding and landslides to southern regions while central areas struggle with opposing extreme weather patterns.

Heavy rain advisories and warnings are currently in effect for the coastal areas of Jeollanam-do and Jeju Island [1]. In the mountainous regions of Jeju, a heavy rain warning was issued as the area experienced intense precipitation of approximately 40mm per hour [1].

Forecasters expect the mountainous areas of Jeju to receive more than 120mm of rain [1]. Other parts of Jeju Island and the Jeollanam-do coast are expected to see totals exceeding 80mm [1].

While the south faces flooding, central regions including Seoul and the Chungcheong area remain under the influence of a heatwave [1]. However, the KMA said that monsoon clouds are moving into these northern territories, which will result in localized showers across the region [1].

The current weather pattern is driven by a stationary front moving northward [1]. This front is bringing the monsoon's impact to the southern and Jeju regions while the central regions maintain high temperatures, though the encroaching rain clouds are beginning to trigger unstable atmospheric conditions.

"In the mountainous areas of Jeju, a 'heavy rain warning' has been issued, and very strong rain is concentrated at around 40mm per hour," a YTN reporter said [1].

“Jeju mountainous areas are expected to receive more than 120mm of rain.”

The simultaneous occurrence of heavy rain in the south and heatwaves in the north highlights the volatile nature of the Korean monsoon transition. The rapid movement of the stationary front suggests a high risk of sudden weather shifts, requiring coordinated national disaster responses to manage both flash flooding in Jeju and heat-related health risks in Seoul.