独立峰の霧雨と突風。濡れた岩稜に細心の注意

Yotei Summit is currently cloudy, with a temperature of 1.1℃ and a perceived temperature of -3℃. Light drizzle is expected to continue through the morning, with temperatures hovering around 0℃. Gusts could reach up to 17.2m/s. Visibility is limited to 2.9km. There is no snow cover; the ground is wet, and the exposed rocky terrain above the tree line at 1400m will be slippery. Muddy conditions are also likely on the trails.

Mount Yotei, an isolated peak, is prone to sudden weather changes and strong winds, which are specific risks. Above the tree line, hikers will be exposed to strong winds, causing the perceived temperature to drop significantly to between -3℃ and -5℃ throughout the day, increasing the risk of hypothermia. The long, direct ascent routes from Hirafu, Makari, Kyogoku, and Kimobetsu demand considerable stamina. Circumnavigating the summit crater (Ohachi-meguri) also poses risks due to poor visibility and potential slips on the wet crater rim.

A quick-drying synthetic base layer, a fleece mid-layer, and a waterproof-breathable outer shell are essential. Gloves and a hat are also mandatory. Full rain gear (jacket and pants) must be carried. Crampons or microspikes are not required, but caution is advised against slipping on wet rocks; maintain careful footing. Gusts of 17.2m/s can cause loss of balance, so extreme care is necessary, especially on exposed ridges and the crater rim typical of an isolated peak. While 2.9km visibility is generally manageable, dense fog could obscure vision, making frequent position checks crucial.

Precipitation is expected to subside in the afternoon, with a brief period of mostly clear skies in the evening, though light drizzle might return overnight. Temperatures will drop to around -2℃ overnight, necessitating additional cold weather gear if activity continues.