霧雨と視界不良。稜線は慎重に行動せよ

Niseko Annupuri summit this morning reports cloudy conditions with visibility under 1km. The temperature is 14.3°C with 95% humidity, indicating a very moist atmosphere. Winds are negligible at 0.21m/s. The base area is warmer at 20.3°C, marking a 6-degree difference from the summit.

Light drizzle is expected to begin around 9 AM, intensifying to moderate drizzle (0.5mm precipitation) by noon and continuing until approximately 3 PM. Visibility on the ridge will remain poor throughout the day. Getting wet from the drizzle combined with poor visibility significantly increases the risk of hypothermia, especially on exposed sections of the ridge. While ridge access is technically possible, the poor visibility poses a high risk of disorientation. Ensure constant navigation with a map, compass, and GPS.

The ground will be wet and muddy due to the persistent drizzle, making rocks and tree roots slippery. Waterproof hiking boots and a full set of rain gear (jacket and pants) are essential. Wear a quick-drying base layer and carry a light fleece or wind shell for layering to regulate body temperature during breaks or when activity ceases. The apparent temperature at 1305m will be around 16°C due to light winds, but it will feel much colder if you get wet.

Although risks of strong winds and thunderstorms are low today, the combination of dampness and poor visibility necessitates vigilance against hypothermia. Stay hydrated and prevent your clothing from getting wet. Temperatures will drop to around 12°C after sunset, making an early return advisable.