濃霧深く岩稜濡れる。道迷いと低体温症に警戒

The summit is partly cloudy with visibility under 1km. The apparent temperature is a low 6.4 degrees Celsius, and light drizzle is forecast to continue intermittently throughout the day. While temperatures will range from 9.5 to 11.8 degrees Celsius, high humidity will persist, increasing the risk of getting wet. A significant temperature difference of approximately 6.5 degrees Celsius exists between the mountain base (14.3C) and the summit (7.8C), necessitating consistent cold weather preparation from the start of the ascent to the summit.

Due to the drizzle, ground conditions will remain wet. The Rock Garden and rocky ridges will be slippery, requiring extreme caution with foot placement. Muddy sections will be prevalent, making waterproof hiking boots essential. Layering should include a moisture-wicking base layer, a mid-layer such as fleece, and a waterproof and breathable rain suit (jacket and pants). Waterproof gloves and a hat should also be carried to prevent hypothermia from getting wet. Remember to pack insulating layers for when you stop moving.

Dense fog with visibility under 1km significantly increases the risk of getting lost, a particular hazard in Tomuraushi. It is easy to lose direction in vast alpine marshes like Kita-numa and Minami-numa. Thorough use of GPS and maps, with frequent location checks, is crucial. Learning from the 2009 Tomuraushi accident, preparedness for sudden weather changes and an early decision to turn back can be life-saving. Drizzle is also forecast for the evening and night, with temperatures dropping to the 6-degree Celsius range. For this long and challenging route, if your trek extends into the night, the risk of hypothermia will further increase.