Extreme Rainfall of Up to 80 mm per Hour Expected in Seoul Metropolitan Area and More on Night of August 3

Heavy rainfall with an hourly precipitation rate of up to 50 to 80 mm is forecast overnight for most areas in the Seoul metropolitan region, as well as Chungnam and Jeonbuk. From August 3 to the morning of August 5, large amounts of rain are expected nationwide due to a strong collision between hot, humid air moving north from the south and dry air descending from the north.

On the afternoon of the 17th of last month, when a heavy rain advisory was in effect, muddy water was surging in Gwangjucheon near Yangdong, Seo-gu, Gwangju. Photo by Yonhap News

As of 5 p.m. on August 3, rain is already falling in most areas west of the Baekdu-daegan mountain range. The rain will expand to cover the entire country, except for the East Coast, later tonight.

Extreme rainfall is expected in several regions. In the Seoul metropolitan area, from the night of August 3 to the morning of August 4, Seoul, Incheon, southern Gyeonggi, and northeastern Gyeonggi may experience rainfall of 50 to 80 mm per hour, while other areas may see about 30 mm per hour. In Chungnam and Jeonbuk, rainfall of 50 to 80 mm per hour is expected between the night of August 3 and the early morning of August 4. In these two regions, heavy rain of 30 to 50 mm per hour is also expected to continue through the morning of August 4. In the southern regions, including the southern coast and areas near Jirisan, rainfall of 50 to 80 mm per hour is expected from the night of August 3 to the morning of August 4. Other areas in the south are expected to receive 30 to 50 mm of rain per hour.

In the Yeongnam region, central and northern Gyeongbuk are expected to receive 30 to 50 mm of rain per hour between the early morning and morning of August 4. Daegu, southern Gyeongbuk, and central and northern Gyeongbuk will each experience heavy rain of about 30 mm per hour from the early morning to the afternoon of August 4, and again in the afternoon. In Gyeongnam, the southern coast and areas near Jirisan will see 30 to 50 mm of rain per hour late at night on August 3, and 50 to 80 mm per hour from early morning to morning on August 4. Other areas will experience 30 to 50 mm per hour between early morning and morning on August 4, followed by about 30 mm per hour in the afternoon. In Jeju, heavy rainfall of 30 to 50 mm per hour is expected in mountainous areas from the night of August 3 to the early morning of August 4. In the morning of August 4, Jeju's mountainous areas will continue to see heavy rain of about 30 mm per hour.

Total precipitation through the morning of August 5 is expected to be 80 to 150 mm in Gwangju, Jeonnam, Busan, Ulsan, and Gyeongnam (with up to 250 mm in the Gyeongnam section of the southern coast and near Jirisan, and over 200 mm in the Jeonnam section); 50 to 100 mm in the Seoul metropolitan area, the five West Sea islands, Daejeon, Sejong, Chungnam, and Jeonbuk (with up to 180 mm or more in southern Chungnam and Jeonbuk, up to 150 mm or more in southeastern and northeastern Gyeonggi, Daejeon, Sejong, and northern Chungnam, and up to 120 mm or more in Seoul and Incheon). In Gangwon's inland and mountainous areas, the central and southern east coast of Gangwon, Chungbuk, Daegu, and Gyeongbuk, 30 to 80 mm of rain is expected (with up to 120 mm or more in central and southern inland Gangwon, central and southern mountainous Gangwon, Chungbuk, northern inland Gyeongbuk, and northeastern mountainous Gyeongbuk).

In Jeju, areas except for the north and west are expected to receive 20 to 60 mm of rain (with up to 150 mm or more in mountainous areas, and up to 100 mm or more in non-mountainous areas), while the north and west will likely see 10 to 40 mm of rain.

Since many areas that suffered flood damage in mid-July have not yet completed recovery work, the forecasted heavy rain may cause significant additional damage. Thorough preparations are necessary. Strong winds with instantaneous speeds of around 55 km/h are also expected along the west coast, south coast, and Jeju, so precautions should be taken.

The heavy rain will bring some relief from the heat wave.

On August 4, morning lows are expected to range from 23 to 27 degrees Celsius, and daytime highs from 29 to 34 degrees Celsius.

The forecasted minimum and maximum temperatures for major cities are as follows: Seoul 26 and 30 degrees, Incheon 25 and 29 degrees, Daejeon 25 and 32 degrees, Gwangju 26 and 33 degrees, Daegu 25 and 33 degrees, Ulsan 25 and 31 degrees, and Busan 26 and 31 degrees.

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