日中は穏やかだが稜線は強風。レイヤリングで体温維持を

Mount Ontake summit recorded clear skies this morning at 11.1 degrees Celsius, with a feels-like temperature of 9 degrees Celsius. The base area registered 21.4 degrees Celsius, indicating a significant temperature difference of over 10 degrees, necessitating careful acclimatization. While daytime temperatures are expected to rise to the mid-14s, strong gusts of 11.7 to 13 meters per second are forecasted from noon through the afternoon.

These strong winds will be particularly noticeable on the exposed white volcanic scree slopes above the treeline and along the ridges leading to Kengamine, the highest point. Wind chill will make the effective temperature feel like a single digit for extended periods. It is crucial to manage body temperature and maintain balance against the wind. A layering system including a wicking base layer, a mid-layer such as fleece, and a windproof outer shell should be carried and adjusted frequently. The ground is dry but slippery due to volcanic scree, requiring cautious foot placement.

A 63 percent chance of precipitation is expected around 3 PM, making rain gear essential. While the risk of lightning is low, carrying a helmet is strongly recommended given Mount Ontake is an active volcano. Temperatures are predicted to drop to around 9 degrees Celsius after sunset. For those planning nighttime activities, a headlamp and adequate cold weather gear are indispensable.