御嶽山 火山礫斜面は穏やか。視界良好

Ontake Summit will experience a calm climbing day, transitioning from partly cloudy to mostly clear skies. Current summit temperature is 5.2°C, feeling like 1.7°C, indicating a significant chill. There is approximately a 10°C temperature difference between the summit and the base, necessitating preparation for the colder conditions at higher altitudes. Temperatures will rise throughout the morning, reaching a high of 9.5°C during the day, though the wind will keep the perceived temperature in the 7-8°C range.

Winds will generally be light, with gusts peaking at 10.9 m/s, which should not significantly impede movement. With no snow cover and no precipitation, the distinctive white volcanic scree slopes leading to Kengamine will be dry. Visibility is excellent, exceeding 20km, promising good views. While no significant warning values were detected by the automated risk assessment, mountain conditions are constantly changing; continuous monitoring of visibility and temperature trends is advised.

For layering, ensure you have a moisture-wicking base layer, a mid-layer such as fleece or a light down jacket, and a waterproof/breathable outer shell for wind and cold protection on the ridge. As Mount Ontake is an active volcano, carrying a helmet is always recommended as a precaution against potential eruption risks. The risk of lightning is low, but be mindful of hypothermia due to the morning chill and wind-induced temperature drops on exposed ridges.

Towards evening and overnight, clear skies are expected, and radiative cooling will drop temperatures to around 2°C. Plan your ascent and descent carefully, aiming to be off the mountain before sunset.