稜線は視界悪く雨強まる。滑落に注意

Hakuba-dake summit is currently experiencing light drizzle with 1.8km visibility. The temperature is 9.6°C, feeling like 7.6°C. This contrasts sharply with the mostly clear 20.1°C at the base.

Light rain will persist throughout the day, intensifying to heavy rain (9mm/3h) around noon, continuing into the afternoon. Consequently, ground conditions will become universally wet and muddy. Particular caution is advised for slippery conditions on wet rocky sections and boardwalks around the exposed alpine flower fields. In areas where residual snow remains, such as the Daisekkei (Great Snow Valley), the rain will soften the snow, increasing the risk of post-holing and rockfall.

Temperatures will hover around 8°C during the day and 7°C at night. Getting wet in the rain significantly lowers the perceived temperature, heightening the risk of hypothermia. Waterproof and breathable rain gear (top and bottom) is essential. A moisture-wicking base layer and a fleece or light down mid-layer are recommended. Continuous layering adjustments are critical for effective body temperature management. Gusts up to 14.3m/s are anticipated, which will further reduce the perceived temperature and deplete energy on exposed ridges.

While no thunderstorms are forecast, summer mountain weather can change rapidly. Vigilance for developing thunderclouds is especially important during the heavier rain periods in the afternoon. Given the poor visibility, wet footing, and risk of hypothermia, today's ridge traverses require prudent judgment, an early start, and a willingness to turn back if conditions deteriorate.