Up to 300 mm of rain fell on Jeju over two days. In some areas, the highest rainfall was recorded in 101 years since observations were made.

According to the Jeju Regional Meteorological Administration on the 2nd, the precipitation from the previous day to 6 a.m. on this day was 333 mm in Sancheondan (northern mid-mountainous area), 296 mm in Seongsan (eastern), 286 mm in Odeung (northern), 280.5 mm in Songdang (northern mid-mountainous area), and Wasan (northern mid-mountainous area). ) 280 mm, Jeju (Northern/Jeju Meteorological Administration) 274.7 mm, Gosan (western) 156.1 mm, Seogwipo (southern) 150.7 mm, etc. Hallasan also received 347 mm of rain in the azalea field, 332 mm in Seongpanak, and 320 mm in Samgakbong Peak.

In particular, the daily precipitation at the Jeju (Northern/Jeju Meteorological Administration) branch the previous day was 238.4 mm, the highest precipitation recorded in November in 101 years since meteorological observations began at this branch in 1923. The previous record was 102 mm on November 18, 2011.

Seongsan (east) and Gosan (Gosan) also exceeded the previous record with daily precipitation of 242.1 mm and 138.4 mm, respectively. Seogwipo (southern) daily precipitation was 126 mm, the third highest on record in November.

The winds were strong and there was a lot of rain, causing damage one after another. As of 10 p.m. the previous day, 19 weather reports related to special weather reports had been received by the Jeju Island Fire and Safety Headquarters, including trees falling, roads and buildings being flooded, and sewers backing up.

The Korea Meteorological Administration announced that the rain that fell in Jeju and Seongsan the previous day was “a level of precipitation in November that could fall once in 200 years.”

The 21st Typhoon ‘Kong-rey’ is cited as the cause of the record-breaking autumn heavy rain. The Korea Meteorological Administration explained that a large amount of water vapor flowed into the passage between Typhoon ‘Kong-rey’ and the North Pacific High Pressure on the right side of the Korean Peninsula, creating a rain cloud zone in the southern sea of ​​Jeju Island. This rain cloud zone moved slowly and the duration of precipitation was prolonged, resulting in very heavy rain.