濃霧と霧雨のトムラウシ。濡れた岩場に注意

As of 7:00 AM, Tomuraushi summit is covered in dense fog with visibility under 1km. The temperature is 12°C with 96% humidity, feeling like 11.9°C. Light rain is forecast to continue intermittently throughout the day until around 3:00 PM, with a high probability of precipitation above 90%. Temperatures are expected to range from 12°C to 14°C. Winds will remain light, with maximum gusts around 6.3 m/s, posing a low risk of strong winds.

Due to the mist and high humidity, the trails are generally wet. Particular caution is advised on the Rock Garden (kyogan-gun) where wet rock surfaces will be slippery. This poor visibility significantly increases the risk of disorientation due to dense fog, a contributing factor in the 2009 accident. Focused route finding and careful movement are essential, especially in open areas like the North Marsh (Kita-numa) and South Marsh (Minami-numa) sky wetlands, and along the ridge lines.

Appropriate warm clothing and rain gear are mandatory. Although the perceived temperature is around 12°C, bodies can cool rapidly when wet from the mist. Wear a quick-drying base layer, an insulating mid-layer such as fleece, and waterproof, breathable outer rainwear. Carrying extra dry insulation is also recommended. Crampons or microspikes are not necessary, but trekking poles will be beneficial for maintaining balance on slippery rocks. While the risk of lightning is low, severe vigilance is required against hypothermia and getting lost. After 6:00 PM, the chance of precipitation decreases, and skies are expected to clear to cloudy by midnight, though dense fog may persist.