Heavy rain fell across South Korea this week, but the Korea Meteorological Administration said the weather does not mark the official start of the summer monsoon [1].
The distinction is critical for national disaster preparedness and agricultural planning, as the official monsoon season typically brings sustained, heavy precipitation that differs from isolated low-pressure systems.
Rainfall exceeded 150 mm in the east coast and the mountainous areas of Jeju [1]. YTN reporter Jeong Hye-yoon said the rain was heavy enough to appear as if the monsoon had already begun [2]. However, the Korea Meteorological Administration (KMA) said the current weather is due to a combination of terrain effects, a stationary front, and a low-pressure system [1].
KMA forecaster Kang Hye-mi said that cooler and drier air from the north will move south after June 21, 2024, pushing the stationary front further south [2]. Because of this atmospheric shift, Kang said the current rainfall does not meet the criteria for the official start of the monsoon [2].
Adding to the volatility, the seventh typhoon of the 2024 season, named Mekala, has formed in the southern sea [1]. The KMA said that this new storm could act as an additional variable, potentially altering rain patterns across the peninsula [1].
While the immediate heavy rain has caused local disruptions, the KMA continues to monitor the interaction between the retreating stationary front and the approach of Typhoon Mekala. The agency said that the atmospheric conditions remain unstable as the region transitions toward the formal summer rainy season [1].
“Rainfall exceeded 150 mm in Jeju’s mountainous areas and the east coast.”
The discrepancy between the perceived start of the rainy season and the official KMA designation highlights the complexity of East Asian weather patterns. The arrival of Typhoon Mekala before the formal monsoon start creates a compounded risk for South Korea, as the country must manage both erratic low-pressure rain events and tropical cyclone threats simultaneously.
