Up to 80mm Heavy Rain in the Seoul Metropolitan Area... Possibility of Autumn Monsoon Due to Triple Typhoons

On the morning of the 29th, due to a low-pressure system developed over the inland southern region of China, rain falling across various parts of the country is expected to continue for some time. From the 30th, a new stationary front is expected to form, bringing the rainy season back and raising the possibility of an "autumn monsoon."

The low-pressure system causing this rain developed over inland southern China the previous day and, as of the morning of the 29th, is located south of the Shandong Peninsula. It is expected to move northeast, pass over the Yellow Sea, and cross North Korea. As the low-pressure system draws in warm and humid air, heavy rain is forecast along its path, and warm, humid air flowing in from the south will cause strong winds and heavy rainfall especially in areas where the wind collides with terrain. According to the Korea Meteorological Administration, the expected rainfall on the 29th is 30-80 mm in the Seoul metropolitan area and Chungcheong region (with over 100 mm in northern Gyeonggi Province), 50-120 mm in Jeolla and Gyeongsang regions (with over 150 mm in eastern Jeonnam and western Gyeongnam), and 30-100 mm in Jeju Island (with over 150 mm in the mountainous areas of Jeju Island).

From the 30th, after the low-pressure system moves away from the Korean Peninsula, relatively cool and dry air will move southward and meet the warm and humid North Pacific High, which has expanded westward, forming a stationary front. This could lead to repeated heavy rainfall at monsoon levels. However, the Korea Meteorological Administration stated that it is currently impossible to predict how long the autumn monsoon will last or which areas will be affected. A KMA official explained, "Multiple typhoons are active simultaneously, and tropical disturbances (low-pressure systems expected to develop in tropical regions) continue to develop over the low-latitude seas south of our country, causing high variability."

Currently, south of the Korean Peninsula, Typhoon No. 9 "Saola," Typhoon No. 10 "Damrey," and Typhoon No. 11 "Haikui" have formed. As of 4 a.m. on the 29th, Haikui is moving westward with a central pressure of 998 hPa and maximum wind speed of 19 m/s, located approximately 810 km northwest of Guam over the sea. If it meets the hot and dry air coming in along the edge of the Tibetan High in early next month, it may change direction toward the Korean Peninsula. Saola and Damrey are not expected to have significant effects on Korea.

This content was produced with the assistance of AI translation services.