Typhoon to Hit Jeju Tonight, Land on South Coast at Midnight... Up to 400mm Rainfall in Jeju by Tomorrow

Up to 300mm in Southern Region and Jeju Island, Over 200mm in Seoul Metropolitan Area, Gangwon Province, and Chungcheong Region
Typhoon
Over 70mm per hour mainly in Jeollanam-do, Gyeongnam, and Jeju
Heavy rain tomorrow in Jeolla and Chungcheong due to low pressure over the West Sea

Typhoon Omais, the 12th typhoon of the season, is expected to pass over Jeju Island tonight and make landfall on the southern coast around midnight, bringing over 400mm of rain to the southern regions. Heavy rain will continue until tomorrow in the Seoul metropolitan area and central regions due to a low-pressure system approaching from the west coast.

On the 23rd, the Korea Meteorological Administration (KMA) forecasted that Typhoon Omais is moving northward approximately 320km northwest of Okinawa, Japan, and very heavy rain will fall over two days due to the influence of the low-pressure system. Rain will begin from dawn in the Chungcheong region, southern regions, and Jeju Island, and from daytime in the Seoul metropolitan area and Gangwon Province.

By the 24th, the southern regions and Jeju Island will receive up to 300mm of rain, with the southern coast and mountainous areas of Jeju experiencing over 400mm of heavy rainfall. The central regions and the five western islands will see up to 150mm, while southern Gyeonggi, central and southern Gangwon, and Chungcheong regions will receive over 200mm. Although Omais is classified as a relatively small typhoon with a central pressure of 998hPa and a strong wind radius of 160km, the combination of typhoon-associated rain clouds and stationary front rain clouds will result in widespread heavy rain nationwide.

Due to the typhoon, from this afternoon until tomorrow morning, hourly rainfall of over 70mm is expected in the Jeollanam-do and Gyeongsangnam-do regions and Jeju Island, while other areas will see about 30 to 50mm per hour. Strong winds exceeding 30m/s will blow in Jeju, and waves in the seas around Jeju, the southern sea, and the southern west sea will rise over 5 meters. Currently, a preliminary typhoon warning has been issued for the sea south of Jeju, and from this afternoon, typhoon warnings will expand to Jeju Island, the islands of Jeollanam-do, and by evening to Busan, Ulsan, Gwangju, Gyeongsangnam-do, Jeollanam-do, and parts of Jeollabuk-do.

Woo Jin-gyu, a forecaster at the KMA, explained, "The southern sea near Jeju will enter the typhoon's influence zone on the morning of the 23rd, the southern coast from the afternoon, and the southern regions from the evening. Around the 24th, the typhoon will weaken into an extratropical cyclone but will not lose strength; instead, it will change its nature and move into the East Coast."

Even if the typhoon moves toward the East Coast, rain will expand from Jeolla Province and western regions to the central regions on the 24th due to a low-pressure system approaching from the west. These areas will also experience heavy rainfall exceeding 70mm per hour. Expected rainfall amounts are up to 300mm in Jeolla Province and over 200mm in the central regions. On Wednesday, the 25th, heavy rain will continue in the southern regions. The low-pressure vortex meeting cold, dry air from the northwest will cause an 'autumn monsoon' to persist in the areas swept by the typhoon.

The KMA urged caution, stating, "With the ground already weakened by heavy rain centered in the Gyeongsangnam-do region, the additional very heavy rain raises concerns about landslides, retaining wall collapses, and falling rocks. Therefore, careful management of facilities is necessary."

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