残雪の室堂 視界不良に注意 午後は霧雨

Current conditions at Mt. Tateyama (Oyama) summit show thin clouds with visibility less than 1km, enveloped in mist. The temperature is 3.4°C, feeling like 1°C due to high humidity at 96%. This high humidity can significantly lower the perceived temperature if you get wet. A wicking base layer, a mid-layer like fleece, and a waterproof/breathable outer shell are essential. While the wind is light this morning, expect light drizzle to begin this afternoon, with temperatures dropping to near 0°C overnight.

The route from Murodo via Ichinokoshi to Oyama summit has lingering snow, with a depth of 34cm. Although rising temperatures will soften the snow, poor visibility makes route finding difficult and increases the risk of not spotting falling rocks from Ichinokoshi. Light drizzle is forecast to start after 3 PM, transitioning to light rain overnight. Getting wet in a 3000m-class mountain environment significantly elevates the risk of hypothermia.

It is crucial to limit your activities to the early morning hours and make a timely decision to turn back before the weather deteriorates. Crampons are not necessary, but microspikes can be beneficial if you are not accustomed to walking on snow. Always carry full rain gear (jacket and pants), sufficient warm layers, and a headlamp.