雨とガス濃く稜線視界不良濡れる登山道

Mount Tokachidake summit is experiencing light rain with a temperature of 11.5°C, feeling like 11.1°C. Visibility is limited to 3km due to fog. The mountain base is under heavy drizzle at 18.6°C, a significant 7.1°C difference from the summit. Showers and drizzle are expected to continue throughout the day, with precipitation intensifying around 9 AM to 2.5mm. Poor visibility is anticipated to persist all day.

Given these conditions, hiking trails are entirely wet, with many muddy sections. The volcanic rocks characteristic of Mount Tokachidake become extremely slippery when wet. Hikers ascending via the Bokaidai Course must exercise extreme caution on volcanic scree slopes and rocky ridges. Those planning a Tokachi Mountain Range Traverse should be aware that poor visibility due to fog on exposed ridges above the tree line poses a high risk of losing the trail.

The summit's apparent temperature will remain around 11°C during the day, but exposure to rain will further lower the perceived temperature. With gusts up to 10.5 m/s, the wind chill could drop temperatures into single digits, presenting a constant risk of hypothermia. Waterproof and breathable outer shells are essential. Wear a quick-drying base layer and carry an insulating mid-layer. There are no signs of thunderstorms currently. Avoid pushing forward in poor visibility. A prompt decision to turn back is crucial if weather conditions do not improve. Rain is expected to subside after 6 PM, with precipitation ceasing after 9 PM. However, nighttime temperatures will drop into single digits, so continued cold weather preparation is vital.