霧雨と低温続く大雪渓。視界不良と低体温症に備えよ

The summit is cloudy with a temperature of 5.3 degrees Celsius, feeling like 3.1 degrees Celsius. Humidity is 99%, and dense fog persists with visibility at 1.5 kilometers. There is approximately a 10-degree Celsius difference between the summit and the base. Drizzle will fall intermittently throughout the day, with temperatures hovering around 5 degrees Celsius. Winds are relatively calm, but gusts may reach 8.9 meters per second at times.

Under these conditions, there is a very high risk of hypothermia due to getting wet. A quick-drying base layer, a fleece or thin down mid-layer, and a waterproof-breathable shell as an outer layer are essential. The Daisekkei (Great Snow Valley) is a remaining snowfield section, and the combination of drizzle, wet conditions, and low temperatures makes the snow surface slippery. Light crampons or microspikes are mandatory equipment. Even in summer, extreme caution is required for slips and post-holing on the Daisekkei. Route finding demands meticulous attention due to the poor visibility.

Keep breaks short during your ascent and descent, and make every effort to stay dry. Be sensitive to changes in your physical condition; if you feel any abnormality, make a prompt decision to turn back. While the risk of thunderstorms is low, drizzle and dense fog are expected to continue throughout the day.

Weak drizzle will persist into the evening and night, with temperatures dropping to the 4-degree Celsius range. Adequate cold weather gear is crucial for overnight stays due to the ongoing risk of hypothermia.