稜線は濃霧と強風。視界不良の霧雨に警戒

Current conditions on Rishiri-zan summit show cloudy skies with dense fog, visibility below 1km. The temperature is 1.4°C, feeling like -2.4°C. There is a significant temperature difference from the base, and conditions deteriorate rapidly with elevation gain. While winds are moderate this morning, they will strengthen from the west towards noon, with gusts exceeding 22m/s by afternoon. Freezing rain is also expected to begin, and temperatures will drop to -1.4°C.

These strong winds combined with freezing rain will drastically lower the wind chill, posing a severe risk of hypothermia. Wind chill could drop below -15°C in the afternoon. Particularly on the unstable volcanic terrain from the 9-gome to the summit, strong winds make it easy to lose balance. Dense fog further reduces visibility, increasing the risk of getting lost or falling. The ground will be wet and muddy due to precipitation, and the exposed volcanic scree will be slippery. A summit attempt today is not recommended. If you are already on the mountain, begin your descent as early as possible this morning.

Essential layering includes a quick-drying base layer, a fleece or light down mid-layer, and a waterproof-breathable outer shell. Gloves and a hat are also crucial. Crampons are not necessary, but choose trekking shoes that can handle slippery ground.

Winds will slightly decrease in the evening, but temperatures will remain below freezing. Although conditions are expected to improve overnight, due to the significant daytime deterioration, any unnecessary activity should be avoided.