[Weather] Rain Nationwide from Early Dawn Tomorrow... Typhoon 'Hinnamno' Moving Westward

[Image source=Yonhap News]

[Asia Economy Reporter Lee Jung-yoon] Rain is expected nationwide from the early morning of the 30th until the morning of the 31st. At times, rainfall could reach around 30mm per hour.

According to the Korea Meteorological Administration (KMA), currently, high pressure systems are positioned over the west, east, and south of South Korea, while the north is open, allowing cold and dry air to descend easily.

In this condition, warm and humid air from the south has risen and collided with the existing cold and dry air, forming rain cloud bands. As a result, rain fell in various places, mainly in the central region and Chungcheong Province, on the morning of the 29th.

The rain cloud band currently extends across southern Gyeonggi-do, Chungcheong, northern Jeollabuk-do, and northern Gyeongsangbuk-do, with rain expected to subside from late afternoon or evening into the night.

The KMA forecasts light rain under 5mm until the night of the 29th in Jeonbuk and Gyeongbuk, with raindrops expected in southeastern Gyeonggi-do, southern Gangwon-do, Jeonnam, and Gyeongnam. Afterwards, a low-pressure system in the southwest will enter South Korea, bringing rain again.

This rain will start in the western regions in the early morning of the 30th, expand nationwide by morning, and then, similar to when the rain began on the 31st early morning, will cease first in the western regions. By the afternoon of the 31st, the entire country is expected to clear up.

The Seoul metropolitan area and Chungnam are expected to experience heavy rain with hourly precipitation around 30mm from morning to afternoon on the 30th. From daytime on the 30th until early morning of the 31st, such heavy rain will mainly affect southern Gangwon-do, Gangwon mountain areas, northern Chungbuk, and northeastern Gyeongbuk.

Total rainfall from the 30th to 31st is expected to be 30-80mm in the central region, northern Jeonbuk, northern Gyeongbuk, the five western islands, Ulleungdo, and Dokdo; and 5-40mm in southern Jeonbuk, Jeonnam, southern Gyeongbuk, Gyeongnam, and Jeju. However, some areas in southern Gyeonggi-do, southern Gangwon-do, central Gangwon mountain areas, northern Gangwon mountain areas, northern Chungcheongbuk-do, and northeastern Gyeongbuk may receive over 120mm of rain.

Temperatures until the 31st are expected to be similar to or lower than the average (morning 18-23°C, daytime 26-30°C). The minimum temperature on the morning of the 30th is expected to be 17-23°C, and the maximum temperature during the day 20-30°C.

Expected minimum and maximum temperatures in major cities are: Seoul and Incheon 19°C and 22°C, Daejeon 20°C and 24°C, Gwangju 22°C and 28°C, Daegu and Ulsan 20°C and 26°C, and Busan 23°C and 27°C.

Typhoon No. 11 "Hinnamnor" formed around 9 PM on the 28th in the sea south-southeast of Tokyo, Japan, and as of 3 PM on the same day, it was passing 980 km south-southeast of Tokyo, moving westward toward the sea east of Taiwan. Currently, Hinnamnor's intensity is "moderate," but it is expected to strengthen to "strong" when passing 990 km south-southwest of Tokyo at 3 PM on the 30th, and further intensify to "very strong" when passing 210 km south of Okinawa at 3 PM on the 2nd of next month, according to the KMA.

From early morning tomorrow until the morning after next, rain will spread nationwide starting from the western regions (summary). Currently, Hinnamnor's intensity is "moderate," but it is expected to strengthen to "strong" when passing 990 km south-southwest of Tokyo at 3 PM on the 30th, and further intensify to "very strong" when passing 210 km south of Okinawa at 3 PM on the 2nd of next month, according to the KMA.

The UK Met Office Unified Model (UM) predicts that Hinnamnor will be influenced by a tropical depression further south, move northward from the 31st, pass through the Kyushu region of Japan, and that the tropical depression influencing Hinnamnor will develop into Typhoon No. 12 and move toward the sea east of Taiwan. The European Centre for Medium-Range Weather Forecasts (ECMWF) model forecasts that Hinnamnor will absorb the southern tropical depression and reach the sea east of Taiwan.

If the situation proceeds as UM predicts, the current forecasted path of Hinnamnor by the KMA will have to be significantly revised. However, both UM and ECMWF agree that a typhoon will be located in the sea east of Taiwan around September 2. At that time, if the Tibetan High extends its boundary toward Shanghai, China, and pushes easterly winds toward the typhoon, the typhoon will make landfall in China; if the Tibetan High does not extend, the typhoon may change direction and pass through the Korea Strait.

When the typhoon is in the sea east of Taiwan, cold air is expected to dominate the atmosphere over South Korea. The warm and humid air brought by the typhoon will collide with the cold air, potentially causing rain mainly in the southern regions and Jeju after September 2.

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