穏やかな夏山登山日和。地獄沼の火山ガスに注意

Hakkoda summit will experience clear to partly cloudy skies today. The daytime perceived temperature will be mild, ranging from 11 to 15 degrees Celsius. Winds will remain light, with gusts up to 4.7 m/s, making for favorable climbing conditions. No precipitation is forecasted, and there is no snow cover, so mountain trails are expected to be generally dry. However, in Hakkoda's characteristic wetlands and stream areas, localized wet sections and muddy conditions may occur due to morning dew or ground moisture. Waterproof hiking boots are therefore essential.

For layering, a moisture-wicking base layer, a thin fleece or long-sleeved shirt as a mid-layer, and a windproof and waterproof shell as an outer layer are recommended. Despite light winds, the perceived temperature will drop during breaks at the summit or as elevation increases, making an outer layer crucial for temperature regulation. Crampons or microspikes are not necessary.

Along the route from Tamoyachidake Ropeway to Odake, particularly around Jigokunuma (Hell Pond), the persistent weak winds could lead to the accumulation of toxic volcanic gases. When passing through this area, move quickly and be prepared to turn back immediately if you notice any unusual symptoms. While no significant alerts were detected by the automatic risk assessment, mountain conditions can change rapidly. Current visibility is somewhat limited at 1.2 kilometers, so be vigilant for sudden changes and continuously monitor surrounding conditions and temperature shifts. Evenings will remain calm but temperatures will gradually drop to around 11 degrees Celsius, so be prepared with an extra layer of insulation if your activity extends into the night.