This weekend, rain is forecasted primarily in the Chungcheong, southern, and Jeju regions. In particular, heavy and abundant rain is expected to concentrate in the 'Jeolla region'. The rain is expected to continue until next week before Liberation Day (Aug. 15). This is referred to as the so-called 'second rainy season' that arrives after the official summer monsoon season has ended.
The Korea Meteorological Administration said in a forecast briefing on the 7th, "Strong rain is expected in the southern Chungcheong region, southern regions, and Jeju Island this weekend on the 9th and 10th," adding, "Especially in the Jeolla region, a heavy amount of 30 to 50 mm of rain is expected per hour."
This heavy rainfall is similar to the characteristics of 'the rainy season' in that the precipitation continues due to the movement of the 'stationary front'. The North Pacific high pressure, located in the southeast of Korea, is currently expanding its influence. Meanwhile, warm humid vapor is being drawn in along the edges of the high pressure, while cold dry air from the north collides, forming a long band-shaped stationary front. This will result in continuous rain. Although the monsoon season officially declared by the Korea Meteorological Administration in June and July has ended, another rainy season has arrived at this point after the season of 'Ipchu' (立秋) has passed.
On Saturday, the 9th, the expected precipitation for the day is ▲ Gwangju Metropolitan City, Jeonnam, Busan, Ulsan, and Gyeongnam 30-80 mm (with Gwangju and Jeonnam expected to exceed 120 mm) ▲ Jeonbuk, Daegu, Gyeongbuk, and Jeju 10-60 mm ▲ Daejeon, southern Chungnam, and southern Chungbuk 5-20 mm. By the daytime of Sunday, the 10th, the stationary front will move south of Jeju, resulting in a temporary stop of rain.
However, starting next week, the stationary front will move upwards, and rain will begin again. Rain is expected on the 11th in Jeju and the southern regions, on the 12th nationwide, and from the 13th to the 14th primarily in the central regions. The Korea Meteorological Administration noted, "If the stationary front remains stagnant for a prolonged time, the amount of precipitation could increase," adding, "There still exists a possibility of dangerous weather next week."
As the rain falls, the heat wave will retreat for a while. All heat wave warnings previously issued in the central regions where it rained the day before have already been lifted, and currently only some parts of the southern regions remain under warning. However, starting from Liberation Day on the 15th, the North Pacific high pressure will cover Korea, resulting in a return of the heat wave.
Meanwhile, the wind and wave warnings currently in effect over the southern sea and Jeju Island are expected to be mostly lifted today. However, on the 9th and 10th, wave heights may rise enough to warrant the re-issuance of a wind and wave warning in this area, necessitating caution.