火口湖へ穏やかな一日。ザレ場は慎重に

At 7 AM, Mount Meakan summit is cloudy with a temperature of 7.1°C, feeling like 4.5°C. Visibility is 2.4km, and winds are calm from the south-southwest at 3m/s. Conditions are expected to improve to mostly clear skies during the day, with temperatures rising to 13.5°C by noon. Southerly winds will remain gentle, with gusts peaking around 10.9m/s. No precipitation is forecast, ensuring dry trail conditions. Ascending via the Onneto Course should be comfortable.

For today's activity, choose a quick-drying base layer. A lightweight fleece or synthetic mid-layer and a windproof, waterproof shell as an outer layer are recommended. While you may shed your mid-layer during active periods in the warmer afternoon, keep it handy for breaks at the summit or along ridges, and for the cooler morning hours. Full rain gear, a hat, and gloves are essential. Crampons or microspikes are not required.

Given the prevailing south to south-southwest winds, sulfur gas from the fumaroles around the crater lake will primarily drift to the northeast. However, always be vigilant for shifts in wind direction or localized eddies. Limit your time near Akamuma and Aonuma, and if you detect gas accumulation, move away promptly. The dry scree slopes can be slippery; exercise extreme caution against falls and slips, especially during descent. While the risk of lightning is low, continuously monitor visibility and temperature changes throughout your hike.