鳥海山日中 稜線に冷たい風 新山周辺は残雪と岩塊に注意

Mount Chokai summit area is mostly clear, but the perceived temperature will remain below freezing throughout the day. While the temperature is expected to rise to 4.4 degrees Celsius by noon, wind gusts exceeding 10 meters per second will drop the perceived temperature to below -5 degrees Celsius. As an isolated peak, Mount Chokai is susceptible to winds from the Sea of Japan. The long ridge routes from Hokodate Course and Yunodai Course to the summit will be particularly exposed to westerly winds, which can be draining. Appropriate wind protection is essential.

Although the summit reports zero snowfall, given Mount Chokai's characteristic of retaining snowfields until autumn, there is a high probability of residual snow in shaded areas and at higher elevations. Some patches may be frozen in the early morning, so carrying light crampons or microspikes is recommended. Around the Shinsan rock mass area, be cautious of rock instability due to daytime temperature rises, as well as slips caused by the freezing and thawing of residual snow.

Visibility is fair at 2.1 kilometers, but weather on isolated peaks can change rapidly. Be prepared for the possibility of sudden dense fog rolling in from the Sea of Japan. After sunset, the summit temperature will drop below 0 degrees Celsius, reaching -0.4 degrees Celsius at night, causing residual snow and wet rock surfaces to refreeze. Nighttime activities will require preparedness for icy conditions and additional cold weather gear.