濃霧に包まれ体感氷点下。湿原での道迷いに警戒

Hakkoda summit will remain cloudy all day with persistent dense fog, reducing visibility to less than 1km. Temperatures will hover around 2°C, but with 99% humidity, the perceived temperature will consistently be below freezing. Gusts up to 16.6m/s have been observed, and exposure on ridges will further drop the apparent temperature, increasing the risk of hypothermia.

While there is no snow cover, the ground will be generally wet, with muddy conditions expected, especially in wetland areas. Given the poor visibility, extreme caution is required to avoid getting lost in the wetlands along routes such as the one from Odake to Sukayu. Always carry a map, compass, and GPS, and continuously confirm your location.

Essential layering includes a moisture-wicking base layer, a fleece or light down mid-layer, and a fully waterproof and windproof shell as an outer layer. Gloves and a warm hat are also mandatory. Crampons or microspikes are not necessary, but full waterproof rain gear is essential.

Temperatures will drop further in the evening, making conditions even harsher. Early termination of activities before sunset is strongly recommended. Be aware of toxic volcanic gases around Jigokunuma.