Tomorrow marks the arrival of the 2026 Seoraksan Grand PhonDo, but due to heavy rain predicted in the weather forecast, the organizers have announced the cancellation of the Grand PhonDo and will only operate the Media PhonDo.
I checked the local weather forecast for tomorrow's Seorak Grand Pond Festival.
Leaving at 7 am, the weather in Guryeong-ryeong will be around 9 am.
Rainfall is expected to be quite heavy, with 7~12mm per hour. More worrisome than the rainfall amount is the strong wind gusting up to 17~19m/s.
9시 전후해서 구룡령 쪽에서 천둥번개 예보는 없습니다.
그다음은 11시 전후해서 조침령이 있는 기린면 일기예보 입니다.
Rainfall is expected to be heavy, with 7mm per hour, but even more worrisome than the rainfall amount is the strong wind gusting up to 22m/s.
It seems that thunderstorms are forecast after the Jochimryeong period, so caution is advised.
참고로 순간최대풍속의 체감관련 아래와 같습니다.
※ 순간풍속(m/s)에 따른 실제 체감 위력
"Gust wind speed" is usually about 1.2 to 1.5 times stronger than the "maximum wind speed" mentioned in regular weather forecasts.
- 10~15m/s: It is difficult to use an umbrella and walk against the wind. (This is the point where riding a bicycle becomes very dangerous.)
- 20m/s: Walking becomes almost impossible, and tree branches break.
- 30m/s: Trees are uprooted and prefabricated roofs fly away.
- 40m/s: A person can fly, and a truck running can overturn.
- 50~60m/s or more: This is the wind speed of a super typhoon. (For reference, the maximum instantaneous wind speed measured at Gosan in Jeju Island during Typhoon 'Maemi' in 2003 was 60m/s.)
Therefore, the gust you feel when a typhoon of average intensity passes is about 20~30m/s in speed, and if you are within the influence of a strong typhoon, 40m/s or more of deadly gusts will blow.
작년에 설악그란폰도 구룡령 정상에서 불었던 강풍의 모습이 담긴 쇼츠입니다. 이런 느낌일건데, 많은 비가 내리는 상황에서 이런 바람이 분다는걸 생각하니 아찔합니다. (주영사이클링 유튜브에서 가져왔습니다.)
https://youtu.be/07wrN6fbaPc?si=x0NsCooWXSo8vDYy
Those who have decided to participate in the Seoraksan Grand Fondo tomorrow, please make sure to prepare for warmth and run safely and slowly downhill so that you can finish without any accidents.
