残雪の稜線は静穏。締まった雪面が続く

As of 7:15 AM, Mt. Yari summit is mostly clear with excellent visibility exceeding 20km. The temperature is a harsh -1.9°C, feeling like -5.5°C. The temperature difference from the base is over 10°C, emphasizing the significant environmental changes with altitude. While there will be some scattered clouds during the day, no precipitation is forecast, and winds will remain mild with gusts up to 7.1m/s, suggesting a calm day.

Snow depth is 156cm. Due to low temperatures and light winds, the snow surface is firm. Daytime temperature increases will be limited to around +2.7°C. Ice patches are likely to have formed in shaded areas and at higher altitudes. Particular caution is required on the Hozaki no Kusariba (chains and ladders to the summit) where icy sections and slippery residual snow pose a risk. Crampons and an ice axe are essential equipment, and careful movement is advised.

Layering should consist of a wicking synthetic base, a fleece or light down mid-layer, and a windproof/waterproof hard shell as an outer layer. Proper management of perspiration during activity and maintaining warmth during breaks is crucial to mitigate hypothermia risk. While the risk of lightning and strong winds is low, be constantly aware of rockfall and potential slips near the summit. Avoid loose rocks and unstable snow masses. Temperatures will drop further in the evening, making the snow surface even harder.