額平川コース 冷涼な水に注意

Currently, the summit of Mount Horoshiri is experiencing a chilly temperature of 0.9°C, with a wind chill factor making it feel like -2.9°C. Daytime high temperatures will barely reach 3.4°C, and with winds around 3m/s, the perceived temperature will remain below freezing. No precipitation is forecast, minimizing the risk of river swelling. However, the Ekihiragawa Course involves numerous river crossings, where cold water can significantly lower body temperature. The ground condition is wet, with slippery riverbeds and exposed rock ridges.

For layering, a moisture-wicking synthetic base layer, a fleece or light down mid-layer, and a waterproof-breathable shell are essential. Always carry an additional insulated jacket for stops or exposed ridge sections to prevent hypothermia. Specialized river shoes and spare socks are also crucial for the Ekihiragawa Course. Given that this is a high-density bear habitat, group travel is strongly recommended, and making noise with bells or radios is advised.

As highlighted by the automatic risk assessment, a sharp temperature drop of 8°C is expected during the forecast period. By 6 PM, the summit temperature will fall to -0.4°C, reaching -5.5°C by midnight. Prolonged activity carries a high risk of hypothermia; adhere strictly to your daytime schedule and make early decisions to turn back if necessary. While the risk of whiteout from strong winds or lightning is low, be cautious of sudden gusts on exposed ridges.