快晴の山頂。残雪多く凍結箇所に警戒

Chokai-san summit currently enjoys clear skies with a temperature of minus 0.1 degrees Celsius and a felt temperature of minus 5.3 degrees Celsius. Winds are from the WSW at 4.16 meters per second, with gusts reaching 19 meters per second. The significant temperature difference of 11.7 degrees between the summit and the base highlights the drastic environmental change with elevation. Clear weather is expected to continue through the day, but temperatures will drop further overnight, remaining below freezing until early morning. The exposed ridges will feel colder due to wind, increasing the risk of hypothermia.

Ground conditions indicate minimal fresh snow at the summit, only 1 centimeter, but extensive residual snow from previous falls. Especially in shaded areas, around the Shinzan lava dome, and on remaining snowfields along the Hokatate and Yunodai courses, overnight freezing is likely to create icy patches. There is a high risk of slipping and falling. Therefore, microspikes or light crampons and an ice axe are essential equipment.

For cold weather layering, wear a quick-drying base layer, a fleece or light down mid-layer, and a wind and waterproof outer shell. For breaks or on windy ridges, an additional warm jacket like a heavier down or fleece is advisable. Minimize exposed skin with gloves, a hat, and a balaclava. While the risk of lightning is low, be cautious of strong gusts that can cause loss of balance.