Typhoon Jangmi is bringing heavy rain to Jeju Island and southern Korea while the Seoul metropolitan area faces a heat wave this Wednesday [1].

The divergent weather patterns create simultaneous risks of flooding in the south and heat-related illnesses in the capital region. This atmospheric split is driven by the typhoon's movement northward from the vicinity of Okinawa [1].

In the southern regions, officials are preparing for a delayed monsoon season. A YTN news anchor said, "Jeju is expected to have a delayed rainy season" [3]. This shift in timing may complicate agricultural planning and local infrastructure readiness.

Forecasters expect significant precipitation in these areas. A YonhapnewsTV reporter said, "Up to 150 mm of heavy rain is expected in Jeju and the south" [1]. The high volume of water poses a risk of landslides, and urban flooding in coastal communities [1].

Meanwhile, residents in the Seoul metropolitan area are experiencing intense heat. The capital region is currently under a heat wave, with temperatures climbing as the storm remains distant [1].

Weather services indicate that the heat will persist for the immediate future. The YonhapnewsTV reporter said, "The maximum temperature in the capital region will reach 33 °C, and the sweltering heat will continue" [1].

Local authorities are monitoring the path of Typhoon Jangmi to determine when the rain will shift toward the north. For now, the peninsula remains divided between extreme moisture and oppressive heat [1, 2].

“Up to 150 mm of heavy rain is expected in Jeju and the south”

The simultaneous occurrence of a delayed monsoon in the south and a heat wave in the north illustrates the volatile nature of the East Asian summer monsoon. When a typhoon's path is diverted or slowed, it can create high-pressure blocks that trap heat in one region while funneling extreme precipitation into another, stressing national emergency response systems across two different types of weather crises.