On the evening of the 3rd, an extreme downpour of 142.1 mm struck Muan County, Jeollanam-do, for one hour. The heavily developed rainclouds are expected to stagnate over the Honam region, resulting in more rainfall than initially predicted. According to the Korea Meteorological Administration, an automatic weather observation system (AWS) installed at Muan Airport in Mangwoon-myeon recorded 142.1 mm of rain from 7:10 p.m. to 8:10 p.m.
Since the expansion of the 62 observation points and the weather observation network used for calculating the national average weather records starting in 1973, the highest hourly rainfall was recorded at 145.0 mm on July 31, 1998, in Juam-myeon, Suncheon City, Jeollanam-do.
Including the AWS observation records, the highest amount of 146.0 mm is known to have been recorded during the night transitioning from July 9 to July 10 last year at Eocheongdo in Gunsan, North Jeolla Province. On that day, a 'historic' deluge fell in Muan County. Muan County receives an average of about 1290 mm of rain annually.
Considering this, it is as if 11% of the yearly rainfall fell in just one hour. In Unnam-myeon, Muan County, 110.5 mm of rain fell from 6:17 p.m. for one hour, while in Wollya-myeon, Hampyeong County, Jeollanam-do, 87.5 mm of rain fell from 8:24 p.m. for one hour.
Not only in Jeollanam-do but also in various places, heavy rain is pouring. As of 9 a.m., heavy rain warnings have been issued in Chungcheongnam-do, Honam, and Gyeongnam, with rainfall rates of 30 to 80 mm per hour occurring in various locations. The Korea Meteorological Administration announced through a weather report at 7:50 p.m. on the 3rd that until the morning of the 5th, 100 to 200 mm, and up to 250 mm of rain is expected to fall in Gwangju and Jeollanam-do, excluding the southern coast.
They also forecasted that 80 to 150 mm, and at most over 200 mm, of rain will fall on the southern coast of Jeollanam-do. Rainfall of 30 to 80 mm per hour is expected across most regions of the country until the morning of the 4th.