日中は残雪と岩稜露出。夕刻の霧雨に備えよ

Tomuraushi summit conditions will shift from clear skies to predominantly cloudy. There is a significant temperature difference compared to the base, with the daytime perceived temperature hovering around 0 degrees Celsius. Exposed ridges and shaded areas will feel even colder. A layering system is essential, consisting of a moisture-wicking base layer, a fleece mid-layer, and a waterproof-breathable outer shell, to allow for easy temperature regulation.

The ground features a mix of 16cm of lingering snow and exposed rocky terrain. Particularly in areas like the Rock Garden with its massive boulders, the weak drizzle expected from late afternoon will make the rocks extremely slippery. Exercise extreme caution against slips and falls. While crampons or microspikes are not strictly necessary, carrying them would be beneficial given the risk of freezing overnight.

Although the wind will remain light throughout the day, the weather in the deep Daisetsuzan range is comparable to that of 3000-meter peaks in Honshu. Cold temperatures combined with drizzle rapidly increase the risk of hypothermia. Always carry rain gear and put it on promptly when needed. Tomuraushi is a challenging long-distance course, and preparedness for sudden weather changes, reminiscent of the 2009 accident, is crucial. As temperatures will drop below freezing overnight, ensure thorough cold weather protection if planning an overnight stay.