Heavy Rainfall Up to 70mm per Hour Tonight... "Beware of Flooding in Low-Lying Areas"

Heatwave Returns After Rain Stops

Heavy rain with a maximum hourly rainfall of up to 70mm is expected overnight on the 4th, so preparations are necessary.

On the 29th, when a 'heavy rain warning' was issued in the metropolitan area, citizens were walking with umbrellas near Gangnam Station in Seoul, where flood damage occurred last year. Photo by Jinhyung Kang aymsdream@

According to the Korea Meteorological Administration (KMA) on the 4th, as of 4:30 PM, a heavy rain advisory has been issued for the Seoul metropolitan area and the northwestern part of Chungnam. A heavy rain warning is expected to be issued for the remaining areas of Chungcheong, the Yeongseo region of Gangwon, most parts of Honam, Jeju, and the northwestern part of Gyeongbuk, prompting the issuance of a heavy rain preliminary warning.

A low-pressure system developing along a stationary front from the west is approaching, causing rain to start falling from the west coast early on the 4th. Currently, rain is falling nationwide except for Gangwon Yeongdong, Honam, and Jeju. In Taean-gun, Chungnam, nearly 70mm of rain has fallen by 4:30 PM on the 4th. Nearby Seosan City recorded 60.7mm, and Buan-gun, Jeonbuk, recorded 56.5mm of cumulative rainfall. Baengnyeongdo in Incheon received 57.0mm, Incheon 33.0mm, and Pyeongtaek City in Gyeonggi 42.0mm of rain. Rain will continue overnight, including on the east coast of Gangwon and Jeju, with most areas experiencing rain until the morning of the 5th.

During the night, localized heavy rain with hourly rainfall of 30 to 60mm is expected. In particular, in the early hours of the 5th, some areas may experience rainfall intensity exceeding 70mm per hour. Except for the Gangwon East Coast, the central region and the northern inland of Gyeongbuk will experience heavy rain from night on the 4th until early morning on the 5th. Honam will see heavy rain in the early morning of the 5th, and the western and southern coastal areas of Gyeongnam and Jeju are expected to have heavy rain from early morning to morning on the 5th.

Strong winds, thunder, and lightning are expected to accompany the heavy rain, so precautions should be taken. In its 5 PM forecast, the KMA predicted rainfall amounts by the 5th as follows: 50 to 100mm in the Seoul metropolitan area, inland and mountainous areas of Gangwon, Chungcheong, northern inland Gyeongbuk, Honam, western and southern coastal areas of Gyeongnam, Jeju, the five western islands, Ulleungdo, and Dokdo; and 20 to 60mm in the Gangwon East Coast, northern East Coast of Gyeongbuk, southern Gyeongbuk, and Gyeongnam (excluding western and southern coastal areas).

The KMA also forecast that areas with heavy rainfall in the Seoul metropolitan area and Jeju could exceed 150mm, and areas with heavy rainfall in inland Gangwon, Chungcheong, Jeonbuk, and the five western islands could exceed 120mm.

Along with the heavy rain overnight, preparations should be made for damage caused by strong winds and flooding in low-lying coastal areas. Most regions are expected to experience gusts exceeding 55 km/h (15 m/s) from the night of the 4th through the 5th. In the mountainous areas of Gangwon, gusts exceeding 70 km/h (20 m/s) are expected until the 6th.

Until the 6th, the lunar gravitational force will be strong, causing higher sea levels. Under these conditions, the low-pressure system developing along the stationary front will bring strong winds and high waves at sea. For safety, it is advised to avoid approaching coastal areas. The KMA requests that access to the west coast be avoided from the night of the 4th to the early morning of the 5th; the southern coast and Jeju coast from the night of the 4th to the early morning of the 5th and again from the night of the 5th to the early morning of the 6th; and the east coast during the daytime on the 5th and 6th.

After the rain stops on the 5th, hot weather is expected to continue. The minimum temperature on the morning of the 5th is forecast to be between 21 and 25 degrees Celsius, and the maximum temperature during the day between 27 and 34 degrees Celsius. Daytime temperatures will exceed 31 degrees Celsius mainly in the Yeongnam region, with high humidity causing the heat index to exceed 33 degrees Celsius, and a heatwave advisory is expected to be issued. The expected minimum and maximum temperatures for major cities are: Seoul 23°C and 30°C, Incheon 22°C and 27°C, Daejeon and Gwangju 24°C and 30°C, Daegu 24°C and 32°C, Ulsan 23°C and 31°C, and Busan 23°C and 30°C.

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