Typhoon No. 10 'Sansan' Brings 186mm Heavy Rain to Hallasan... Caution for Strong Winds and High Waves

Seogwipo Maximum Wave Height 7.2m ... Sea Routes to Wando and Jindo Closed

Typhoon No. 10 'Sansan' is moving northward toward Japan, and on the 28th, strong wind and high wave warnings were issued for Jeju, bringing strong winds and rain.

[Image source=Yonhap News]

The Jeju Regional Meteorological Administration issued a strong wind advisory for the entire Jeju Island at 1 p.m. As of 6 p.m., the maximum instantaneous wind speeds at major locations were 20.5 m/s at Sajaebi on Hallasan, 20.1 m/s at Saebyeol Oreum, 18.5 m/s at Gimnyeong, 17.2 m/s at Marado, 17.2 m/s at Seoho, and 16.2 m/s at Gangjeong.

The Meteorological Administration warned that as strong easterly winds flow in, some mountainous areas could experience maximum instantaneous wind speeds of 20 to 25 m/s or more until the early morning of the day after tomorrow (the 30th), urging caution in facility management and safety accidents.

Since early morning today, heavy rain warnings have been issued for the mountainous areas, northern mid-mountain regions, and western parts of Jeju Island, with the warning levels fluctuating between advisories, warnings, and cancellations, resulting in continuous rainfall.

From midnight to 6 p.m. today, rainfall amounts in the Hallasan area were 186.5 mm at Witseoreum, 185.5 mm at Eorimok, 159.5 mm at Sajaebi, 152.5 mm at Samgakbong, and 137.0 mm at Jindallaebat. In the mid-mountain regions at elevations between 200 and 600 meters, Saebyeol Oreum recorded 117.0 mm, Geumak 113.0 mm, Sancheondan 66.0 mm, Odeung 29.0 mm, and Seogwang 20.5 mm. Coastal areas recorded 62.0 mm at Hallim, 31.5 mm at Nakcheon, 12.7 mm at Gosan, 8.5 mm at Namwon, and 5.1 mm at Seongsan. The heavy rain advisory for the northern mid-mountain and mountainous areas was lifted at 6 p.m.

Strong winds also blew over the sea, prompting high wave warnings in various locations. As of 6 p.m., high wave warnings were in effect for all seas around Jeju Island and the western offshore waters of the west coast. Waves in the waters in front of Jeju Island and the southern offshore waters of Jeju Island were very high, ranging from 3.0 to 5.0 meters, while other seas had waves between 1.5 and 3.0 meters. The maximum wave heights at major points were 7.2 meters at Seogwipo, 4.7 meters at Marado, 4.2 meters at Chujado, and 4.7 meters at Sinsan.

Accordingly, the Songrim Blue Ocean ferry departing from Jeju Port and passing through Chujado to Wando, and the Santa Monica ferry passing through Chujado to Jindo, were canceled. Additionally, five passenger ferries operating between Moseulpo Port in Daejeong-eup, Seogwipo City, and Gapa Island and Marado were also suspended.

Very strong easterly winds will continue to flow into all seas around Jeju Island and the western offshore waters of the southern sea until the early morning of the day after tomorrow, causing waves to rise further. Gusts and thunder and lightning are expected, so ships navigating or fishing are urged to exercise special caution. All sections of the Hallasan National Park trails and the Olle Trail are currently closed.