幌尻岳 視界不良と低温。沢の増水に警戒せよ

Mount Poroshiri summit experiences cloudy conditions with visibility under 1km. The temperature is 3.3°C, feeling like 0.8°C, indicating near-freezing conditions even during the day. A significant temperature difference of 13.9°C exists compared to the base, meaning conditions cool rapidly with elevation gain. Light drizzle is expected from the morning and will continue intermittently throughout the day, with precipitation probability exceeding 80% by evening and turning into light rain overnight.

Ground conditions are already wet, and the persistent precipitation will lead to muddy terrain, especially along the Ekihiragawa course's numerous river crossings. With over 20 river crossings on this route, the risk of swollen rivers is constant. As precipitation intensifies from afternoon into night, be cautious of rising water levels and prioritize safety by avoiding dangerous crossings.

Despite calm winds, the low temperature and 96% humidity elevate the risk of hypothermia if clothing becomes wet. Essential layering includes a fast-drying synthetic or merino wool base layer, a thick fleece or light insulated jacket for a mid-layer, and a waterproof/breathable shell for the outer layer. Carrying waterproof gloves and a warm hat is also crucial for comprehensive cold and wet weather protection. Persistent low visibility also necessitates extreme caution with route finding, particularly in areas like the cirque terrain.