午前は霧雨と視界不良。午後は回復へ

Tomuraushi summit currently experiences light rain with a temperature of 11.8°C, feeling like 11°C. Humidity is high at 98%, and visibility is limited to 2.7km. Light drizzle is expected to continue from 9 AM to noon, with no significant improvement in visibility. During this period, there is a high risk of getting lost due to dense fog in open areas like the Kita-numa and Minami-numa alpine wetlands, and the Rock Garden. Recalling the lessons from the 2009 incident, extreme caution is advised, especially in poor visibility conditions.

In the morning's light rain and 98% humidity, exposure to gusts up to 11.1 m/s on ridges will further lower the perceived temperature, posing a risk of hypothermia. Tomuraushi often experiences weather comparable to 3000m peaks in Honshu, so careful consideration is needed when moving in wet conditions. Wear a quick-drying base layer and carry a thin fleece as a mid-layer. A waterproof breathable outer shell is essential for both rain protection and warmth. The ground is wet to muddy throughout, particularly slippery in rocky areas like the Rock Garden.

By 3 PM, the weather is expected to clear to sunny skies, which will persist through the night. Winds will calm, and nighttime temperatures will stabilize around 11°C. Afternoon conditions will be more comfortable, but given the long distance and challenging nature of the Tomuraushi route, an early start and ample time management are crucial.