Heavy Rain Nationwide on 13-14, Showers on Weekend... Up to 150mm in Northern Gyeonggi

Heavy Rain Expands from Central Region in the Morning of the 13th to Gyeongsang Area in the Afternoon
Over 120mm in Gangwon Yeongseo, 30-100mm in Central Region, Jeolla Area, and Gyeongbuk Area
Showers Mainly Inland from 15th to 17th, Possible Rain from Stationary Front After the 18th

[Asia Economy Reporter Han Jinju] The monsoon rain will continue across various parts of the country through this weekend. From the 13th to the 14th, heavy rain is expected mainly in the central regions due to the stationary front and low-pressure system, and from the 15th to the 17th, showers will fall mainly in inland areas.

On the 12th, the Korea Meteorological Administration held an occasional briefing and announced that a stationary front developing as a result of the collision between the subtropical high pressure and cold, dry air moving southward from the north will move from west to east, affecting South Korea. From early morning to morning on the 13th, monsoon rain will begin in the central regions and Jeolla area, expanding to the Gyeongsang area by the afternoon.

In the northern Gyeonggi region, rainfall could exceed 150mm, in the central and northern Yeongseo area of Gangwon Province over 120mm, and 30 to 100mm in other central regions, Jeolla, and northern Gyeongsang areas. The southern Yeongdong area of Gangwon, the eastern coast of northern Gyeongsang, and the Gyeongnam area will receive about 10 to 60mm of rain. There is also a possibility of heavy rain warnings being issued mainly for the central regions.

The stationary front is long east-west and narrow north-south, and at the time it passes, heavy rain of 30 to 50mm per hour accompanied by gusts and thunder and lightning is expected. The timing of concentrated rainfall varies by region. In the central regions, rain will be concentrated from noon to evening on the 13th due to the low-pressure system accompanying the stationary front, while in the Chungcheong, Jeolla, and western Gyeongsang areas, heavy rain is expected from night on the 13th to morning on the 14th.

On the 14th, as the stationary front moves southward, precipitation will end starting from the northern areas. From early morning to morning on the 14th, rain will begin to stop in the Seoul metropolitan area, Chungcheong region, and most parts of Gangwon Province, and by daytime, rain is expected to cease in most parts of the country.

Forecaster Lee Kwang-yeon explained, "Warm and humid air flows in from the southwest along the lower jet stream, and dry air descends from the upper layers, creating unstable atmospheric conditions favorable for the development of very strong rain clouds. Rainfall will be concentrated at the time the stationary front passes, but precipitation amounts will be low before and after its passage. The timing and amount of rainfall will vary significantly by region depending on the speed of the front’s southward movement and the influence of the low-pressure system."

On the 1st, as the monsoon entered a lull, the water level of the Han River in Seoul is decreasing. Photo by Jang Jin-hyung aymsdream@

From the 15th to the 17th, showers are expected mainly in inland areas. Cold air moves southward from the north, and the ground heats up due to sunlight, causing temperature differences between upper and lower layers, which destabilizes the atmosphere and leads to showers.

Forecaster Lee said, "In areas where shower clouds develop, gusts and thunder and lightning are expected. The stationary front is unlikely to move northward until the 17th, so the influence of showers will continue. Since the showers are not large in scale, there will be significant regional variability."

From Monday the 18th onward, there is a possibility of rain again due to the influence of the stationary front. However, the situation is highly variable due to a 'blocking' phenomenon that prevents air from flowing west to east near the Sea of Okhotsk and Manchuria. The stationary front forms where the subtropical high pressure meets cold air descending from the north, but the blocking phenomenon can alter the strength of the cold air.

For the time being, the heatwave exceeding average temperatures is expected to continue. From the 15th to the 22nd, the daytime high temperature in Seoul is forecast to be 29 to 31 degrees Celsius, and in Daegu, 31 to 33 degrees Celsius. The recent heatwave is characterized by alternating monsoon rain and hot, humid air brought in by the stationary front or typhoons. This differs from the heatwaves caused by the Tibetan high pressure and North Pacific high pressure that typically occur after the monsoon season.

Forecaster Lee explained, "Traditional summer heatwaves are mainly determined by the expansion of the Tibetan high pressure and the North Pacific high pressure, and the current heatwave has different causes from traditional summer heat. At this point, numerical model forecasts and climate change monitoring factors we have analyzed are showing complex patterns, so we will provide further explanations about the heatwave after the monsoon season."

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