On the 12th in Jeju, strong winds amid hot weather caused various wind damage, including disrupting aircraft operations.
According to the Jeju Regional Meteorological Administration, winds blew strongly at around 20 meters per second in instantaneous speed, mainly in the mountainous areas of Jeju Island and the western side of Hallasan. In other areas, strong winds blew at around 15 meters per second in instantaneous speed.
The one-hour maximum instantaneous wind speeds (meters per second) at major points were 28.9 at Hallasan Samgakbong, 21.9 at Saebyeol Oreum, 19.6 at Gosan, 16.3 at Daeheul, and 15.8 at Saekdal.
A strong wind advisory has been issued for the mountainous areas of Jeju Island, and for the western, northern, and mid-mountain areas of Jeju City, as well as the western, southern, and mid-mountain areas of Seogwipo City. At Jeju International Airport, where a strong wind warning and a sudden wind (gust) warning were in effect simultaneously, numerous flights were canceled due to strong winds.
As of 3 p.m. that day, 105 flights were canceled, including 103 domestic flights (48 departures, 55 arrivals) and 2 international flights (1 departure, 1 arrival), and 85 flights were delayed. In addition, three international flights returned.
Jeju Airport put the "caution" level for supporting stranded passengers into effect and began preparations. The "caution" level is issued when there are at least 3,000 canceled-passenger seats for flights departing Jeju.
A Jeju Airport official said, "Aircraft operations continue to be disrupted due to strong winds," adding, "Passengers should check flight information in advance."
In downtown Jeju, safety measures were taken as signs and building exterior materials fell in the strong wind. The previous day, a pedestrian signal fell and street trees toppled in the wind, resulting in a total of about 30 facility safety measures taken over two days.
The Korea Meteorological Administration urged people to take special care with facility management and safety, noting that winds would blow very strongly at 20 meters per second or higher (25 meters per second or higher in the mountains) across most of Jeju Island until late that afternoon.
In sea areas such as the far southern waters off Jeju Island and the waters off Jeju Island, where a high seas warning was issued, winds blew very strongly at 10–16 meters per second, and waves rose very high at 1.5–4 meters, disrupting ferry operations.
For the time being, high swells will pound beaches along the coast of Jeju Island or sweep over rocky shores and breakwaters, so vacationers should be cautious.