Heavy Rain in Jeju and Southern Coast Due to Indirect Influence of Typhoon 'Rose'

Typhoon 'Rose,' currently located southwest of Okinawa, Japan, is expected to bring heavy rain to South Korea's southern coastal regions and Jeju Island on the first day of June. However, the typhoon itself will not make landfall, and its direct impact will be minimal on inland areas.

The significant rainfall is not a direct result of the typhoon's core but rather a consequence of the atmospheric conditions it creates. Moist air is being drawn northward by the strong winds between the typhoon and a dominant Pacific high-pressure system. This warm, humid air is colliding with drier air over the Korean Peninsula, leading to intense precipitation.

Weather authorities predict rainfall rates of 20 to 30 millimeters per hour in the affected areas. Total rainfall is estimated between 20 to 60 millimeters for the southern coast, 30 to 80 millimeters for Jeju Island, and over 150 millimeters for Jeju's mountainous regions. The unstable atmospheric conditions may also bring strong winds alongside the rain. Maritime warnings are in effect, with the possibility of a typhoon warning being upgraded if conditions worsen, which would make 'Rose' the first typhoon to significantly impact South Korea this year.

The forecast indicates that the rain will largely cease by June 2 as the typhoon moves northeast and the supply of moisture weakens. Following the typhoon's passage, easterly winds are expected to cause temperatures in inland areas to soar above 33 degrees Celsius due to the Foehn effect, where air heats up as it descends mountain slopes. This heatwave is predicted to last until around June 4, after which temperatures are expected to return to seasonal norms.

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Areas within the typhoon's radius, such as Jeju Island and the southern coast, should be cautious of high waves and swells. There is a possibility that the wind and wave warnings could be upgraded to typhoon warnings.