濃霧立ち込め低温の羅臼岳視界不良

Rausu Peak is currently enveloped in dense fog with visibility under 1km. The summit temperature is 6.5℃, feeling like 4.5℃, with 95% humidity. This significant temperature difference from the base, over 10℃, makes the summit feel even colder. The typical sea fog, a specific risk for Rausu Peak, is causing challenging conditions. Careful route-finding is essential, especially on the upper sections of the Iwaobetsu Course and Rausu Course (Shiretoko Pass). This dense fog also increases the risk of unexpected encounters with brown bears, making bear bells, bear spray, and a food locker mandatory.

The forecast for the day shows temperatures rising to around 10℃, but the dense fog is expected to persist. Although the wind will be light, maintaining body temperature is crucial due to high humidity and poor visibility. Wear a quick-drying base layer, a fleece or light down mid-layer, and a waterproof-breathable rainwear as an outer layer. Adjust layers frequently during activity to regulate body temperature. The ground is likely wet to muddy due to the fog, and rocky sections will be slippery. Waterproof hiking boots, gloves, and a hat are essential.

While no significant alerts were detected by the automated risk assessment, the combination of low temperatures (6.5℃, feeling like 4.5℃), high humidity, and poor visibility increases the risk of hypothermia. This risk is further amplified if progress slows due to limited visibility. Avoid pushing too hard and be prepared to turn back immediately if you feel unwell.

Weak drizzle is possible around 6 PM, and temperatures will drop to around 6℃ overnight. Although visibility may temporarily improve at night, adequate cold weather gear is essential if you plan to stay on the mountain.