終日雨と霧に包まれ視界不良 地獄谷周辺は特に注意

Mount Asahidake summit area will be enveloped in rain and fog throughout the day. Current visibility is less than 1 kilometer, and similar poor visibility is expected to persist. While the base is experiencing light rain at 11.6 degrees Celsius, the summit will be 9.5 degrees, dropping to 6 degrees by evening. Although winds are light, continuous precipitation will make the perceived temperature feel much colder. Ground conditions will be consistently wet to muddy, with rock sections becoming slippery.

Navigating in poor visibility poses significant risks. On the route from the Asahidake Ropeway Sugatami Station to the summit, particularly around the Jigokudani (Hell Valley) area where fumaroles are active, the dangers of volcanic gas and hot springs increase. Unintended deviation from the trail in low visibility could be fatal. Wooden paths and rocky areas within the alpine plant communities will also be slick from the rain, requiring careful footing.

Hypothermia is the highest risk today. Essential gear includes a quick-drying base layer, a mid-layer such as fleece, and full waterproof and breathable rainwear. Always carry spare warm clothing, gloves, and a hat. While crampons or microspikes are not necessary, waterproof hiking boots are crucial. There is a low risk of lightning or strong winds, but a summit attempt is not recommended today. Prolonged exposure significantly elevates the risk of hypothermia, making an early start and timely turnaround decisions vital.