稜線は低温の霧雨。濡れと寒さに備えよ

As of 7:15 AM, Hakuba-dake summit is experiencing light drizzle with a temperature of 7.5°C, feeling like 5.6°C, and 99% humidity. Wind speed is 2.3m/s with gusts up to 7.2m/s. Light drizzle is expected to continue throughout the day until approximately 6 PM, with precipitation probabilities ranging from 73% to 100%. While the temperature will gradually rise to 10.1°C by 3 PM, the perceived temperature will remain in the single digits.

There is a significant 12°C temperature difference between the summit and the base, which is mostly clear at 19.5°C. Therefore, full waterproof and thermal layering is essential for summit activities, even in summer. A quick-drying base layer, fleece or light down as a mid-layer, and a waterproof/breathable shell are mandatory. Continuous adjustment of layers is needed to manage body temperature and prevent hypothermia, as the ground will be wet and slippery due to the ongoing drizzle.

For those traversing the Daisekkei (Great Snow Valley) or heading towards Hakuba Oike, be aware that the wet conditions will make the snow surface and rocky sections slick. Despite zero snow depth, light crampons or chain spikes and an ice axe or trekking poles are highly recommended for safe passage on any remaining snow patches. Exposed areas such as the alpine flower fields (Ohanabatake) along the ridge present a higher risk of hypothermia if one remains wet and exposed to the wind for extended periods. Conditions are forecast to improve after 9 PM, clearing overnight, but temperatures will stay around 7°C, requiring continued vigilance with cold weather gear.