山頂は視界不良。穏やかな風でも噴気孔群に注意

As of 7:15 AM, the summit of Mt. Meakan is cloudy with a temperature of 11.6℃ and a feel of 10.2℃. Visibility is less than 1km, which is very poor. The day will see partly cloudy skies, with the summit temperature expected to rise to 16.8℃ by noon. Winds will be northerly with gusts up to 9.7m/s, generally mild, but extreme caution is required due to the limited visibility. The ground is dry due to no precipitation, but with 90% humidity, some areas may be damp, and muddy conditions are possible in depressions or shaded spots. Crampons or microspikes are not needed.

Operating in poor visibility is hazardous. Particular attention must be paid around the crater lakes (Akanuma, Aonuma) and fumarole areas, where the risk of acute sulfur gas poisoning changes with wind direction. The scree slopes near the summit on the Onneto Course also pose an increased risk of slipping and falling when visibility is low. For layering, use a wicking base layer, a thin fleece or synthetic jacket for a mid-layer, and a waterproof-breathable shell for an outer layer. There is about a 5℃ temperature difference between the base and the summit, making the summit feel chilly.

As indicated by the automated risk assessment, a rapid temperature drop of 7℃ is expected during the forecast period. Specifically, temperatures will fall sharply from 16℃ in the afternoon to the 8℃ range by night. Carry an extra insulating layer from the start to prepare for sudden changes during your activity. While lightning risk is low, high humidity and the overnight drop in temperature increase the risk of hypothermia. Make an early decision to turn back if conditions deteriorate. Today's climb necessitates careful preparation for poor visibility and an acute awareness of volcanic activity.