十勝岳は穏やかな一日。夕方からの気温急降下に備えよ

Today on Tokachidake, daytime conditions will generally be favorable for climbing. Wind chill temperatures near the summit are expected to range from around 8°C in the morning to about 4°C in the afternoon. On the Bogakudai Course, above the treeline, ground conditions will be a mix of remaining snow and exposed rock. Although snow depth is minimal at around 3cm, daytime warming will lead to melting, potentially creating muddy sections. While full crampons are not necessary, carrying microspikes or similar traction devices is advisable depending on the specific snow conditions encountered.

By approximately 3 PM, westerly winds could intensify with gusts reaching up to 15.4 m/s. Along exposed ridges above the treeline, these strong winds will significantly lower the perceived temperature. It is crucial to carry a windproof outer jacket and manage your layers diligently to regulate body temperature. As Tokachidake is an active volcano, sections with high volcanic gas concentrations exist. Should you experience any physical discomfort, make the immediate decision to turn back.

As indicated by the automated risk assessment, a sharp temperature drop exceeding 11°C is anticipated during the forecast period. Temperatures will begin to fall significantly after 6 PM, reaching below freezing point overnight. Be prepared for sudden changes in conditions by carrying an extra thermal layer from the outset. Any activity after sunset should be avoided due to the extremely high risk of hypothermia. The risk of thunderstorms is low. While strong winds will peak in the afternoon, the primary concern for hypothermia will arise from the evening temperature drop and sub-zero night temperatures. Focus on daytime activities and plan for an early, safe descent.