稜線は濃霧と小雨。視界不良と滑りやすい足元に注意

Currently, Hakuba Peak is at 2.8°C with a feel of -0.1°C, 99% humidity, and dense fog limiting visibility to less than 1km. The temperature difference from the base is a significant -9.8°C, indicating a sharp drop in temperature as you ascend. Although it is expected to be partly cloudy during the day, light drizzle with a 98% chance of precipitation will begin around noon and continue intermittently throughout the afternoon. While the temperature might rise to 6.5°C during the day, the high humidity and wind will make it feel colder.

Ground conditions are very wet due to low temperatures and high humidity, affecting both remaining snow and exposed rocky sections. Particularly in shaded or hollow areas, residual snow is likely to be hard and icy. Microspikes or light crampons are essential for areas like the Hakuba Daisekkei (Great Snow Valley) and surrounding snowy sections, which typically require them even in summer. Always carry and use them on icy patches. Dense fog with visibility under 1km persists, requiring extreme caution for route finding, especially around the scenic alpine flower fields on the ridge.

While the risk of lightning is low, strong gusts up to 11.6m/s will significantly lower the perceived temperature. The combination of low temperatures, high humidity, and light drizzle considerably elevates the risk of hypothermia. A three-layer system consisting of a moisture-wicking base layer, fleece, and waterproof breathable rainwear is crucial. Wear extra insulation during breaks and change wet clothing promptly. Given the poor visibility, slippery footing, and hypothermia risk, a cautious action plan is required.

Light drizzle will continue from evening into night, with temperatures dropping further to around 0°C. Gusts are forecast to intensify up to 14.8m/s by midnight, making nighttime activities extremely hazardous.