Rain is forecast to begin in central South Korea today and spread nationwide through the weekend [1].

The weather shift arrives during a period of continued heat, potentially disrupting travel and outdoor activities across the peninsula as the system expands.

Meteorologists said the precipitation is due to the indirect influence of Typhoon Saudel [1]. The storm is driving a warm, moist southwesterly flow toward the Korean Peninsula, which is interacting with a high-pressure system located to the north and east [1].

Rainfall is expected to begin in the central region today before moving across the rest of the country [1]. Specifically, the Seoul metropolitan area and Gangwon Province are forecast to receive between five and 30 mm of rain [1].

Additional precipitation is expected tomorrow on the southern coast of Gyeongsangnam-do [1]. This coastal region is likely to see intensified activity as the atmospheric conditions persist through the end of the week.

Weather reporters said the rain comes while heat continues to affect the region [1]. The interaction between the typhoon's outer bands and the existing high-pressure system creates the necessary instability for these widespread showers.

Residents in the southern coastal areas are advised to monitor local updates as the system progresses toward the weekend [1].

Rain is forecast to begin in central South Korea today and spread nationwide through the weekend.

The indirect influence of a typhoon allows a storm to affect weather patterns far from its center. In this case, Typhoon Saudel is not making a direct landfall but is acting as a pump, pushing moisture-rich air into a region where it clashes with high-pressure systems, resulting in widespread rain rather than a concentrated storm hit.