Extreme rainfall hit the Korean Peninsula this week after unusually warm sea temperatures triggered a series of successive typhoons [1].

The weather pattern creates a volatile cycle of flooding and intense heat that threatens regional infrastructure and public safety. Meteorologists warn that the atmospheric instability is driven by a specific interaction between tropical moisture and northern air masses.

Sea surface temperatures in the southern offshore waters have reached approximately 29°C, which is higher than the climatological average [1]. Reporter Park So-jung of YTN said these temperatures have essentially turned the tropical ocean into a low-pressure factory [1]. This heat fuels the development of typhoons that inject massive amounts of moisture into the atmosphere.

Several storms have recently impacted the region. These include Typhoon 13 Dolphin, which dissipated after landing in China, and Typhoon 15 Chan-hom, which weakened after passing Japan [1]. Other systems included Typhoon 16, which died at sea, and Typhoon 17 Nangka [1].

While some of these typhoons bypassed the peninsula directly, they left behind significant rain clouds. Park said the remaining clouds pushed into the peninsula, resulting in surprise heavy rainfall [1]. This occurs when the tropical moisture collides with colder air from the north, creating the instability required for extreme precipitation.

Following the period of heavy rain, the region is expected to face a return of intense heat. The combination of high humidity from the recent storms and rising temperatures is expected to create a "steaming" heat wave effect across the peninsula [1].

“Sea surface temperatures in the southern offshore waters have reached approximately 29°C.”

The current weather volatility on the Korean Peninsula illustrates the direct link between rising ocean temperatures and atmospheric instability. When sea surface temperatures exceed historical norms, they provide the thermal energy necessary to sustain more frequent and intense tropical cyclones. This creates a feedback loop where the resulting moisture, when meeting cooler continental air, produces extreme rainfall events followed by oppressive humidity, complicating regional disaster management and climate adaptation efforts.