残雪期羅臼岳。雪渓上の滑落と濃霧に注意

The summit area is cloudy with poor visibility of 2.1km. Daytime temperatures will range from 0 to 4 degrees Celsius, but wind chill may bring the perceived temperature below freezing at times. Although Mount Rausu is considered a summer-only ascent, May still sees significant lingering snow, and higher elevations and gullies are highly likely to retain snowfields. The reported snow depth of 0cm is from a specific observation point, and extreme caution is required for potential slips and falls on these snowfields. Carrying light crampons or microspikes is strongly recommended.

Winds will be relatively calm throughout the day, but the characteristic sea breeze of Shiretoko can easily bring dense fog, requiring vigilance for deteriorating visibility and sudden weather changes. Light drizzle is forecast from around 18:00, so waterproof and breathable shell gear is essential. Ground conditions are expected to be a mix of wet, muddy, and lingering snow.

While hypothermia risk can be mitigated with proper layering and activity management, warm layers are crucial during breaks or on exposed ridges where perceived temperatures can drop significantly. As Mount Rausu is a bear habitat, carrying a bear canister and bear deterrents like bells and spray is mandatory. Winds are expected to strengthen slightly overnight, with northwesterly gusts reaching up to 11.2m/s. Limit your activities to daylight hours and plan for an early descent.