午後霧雨の沢ルート。額平川コースは増水に注意

Mount Poroshiri starts cloudy today, with summit temperatures rising to 12.3°C by noon. However, strong drizzle is expected from 3 PM, and humid conditions will persist. There's a significant temperature difference from the base, with the summit feeling as cold as 6.7°C at 7 AM, and around 8.7°C even during the afternoon drizzle.

Trail conditions will be wet to muddy overall. On the Nukanobira River Course, which involves over 20 river crossings, the afternoon drizzle may lead to increased water levels. Careful assessment of crossing points is crucial, especially in the afternoon and evening. As this is a dense bear habitat, extra vigilance is required during periods of reduced visibility due to drizzle.

The risk of hypothermia is elevated. Wet clothing can rapidly deplete body heat, making a quick-dry base layer, a fleece mid-layer, and a waterproof-breathable outer layer essential. Carry a light synthetic insulated jacket for breaks or unexpected stops. River shoes, spare socks, a waterproof bag, and bear safety equipment are also indispensable.

While there's no significant risk of lightning or strong winds, hypothermia due to wet conditions demands utmost attention. Constantly monitor river levels and avoid risky crossings. Precipitation will cease by evening, but temperatures will drop to 7.4°C, so avoid prolonged exposure in wet clothing.