トムラウシ日中安定。午後の気温低下に備えよ

Tomuraushi summit currently enjoys mostly clear skies with a temperature of 15.3°C, feeling like approximately 12°C. Ground conditions are dry, and areas like the Rock Garden are stable. For daytime activity, a base layer, a light mid-layer, and a windproof shell are essential. Forecasts indicate partly cloudy to cloudy conditions until early afternoon, with maximum gusts around 8.5 m/s, posing low wind risk.

However, remember this is a long course, challenging for a single day, and experiences weather comparable to 3000m peaks in Honshu. Temperatures will gradually drop from around 3 PM, with a projected decrease of up to 6°C over the forecast period. By night, the wind chill could fall to the 7°C range, significantly increasing the risk of hypothermia during breaks or periods of inactivity. Carry an extra insulating layer from the start and dress warmly without delay. Be prepared to turn back early if conditions worsen.

Light rain is forecasted for around 3 AM tomorrow, which may lead to reduced visibility. The risk of getting lost in dense fog is particularly high in expansive and complex terrains such as the Kitah-numa and Minami-numa alpine wetlands, and the Rock Garden with its scattered boulders. Always verify your current position with a GPS and map. Consider retreating if visibility becomes poor. While the risk of lightning is low, a headlamp with spare batteries and adequate rain gear and insulation are mandatory, especially if anticipating post-sunset activity.