一ノ越岩稜帯 午後から濡れ注意

Mt. Tateyama (Oyama) is currently cloudy, with a summit felt temperature of 1.3°C, notably colder than the base. Visibility is good and winds are light this morning. Although the temperature is expected to rise to a peak of 7.1°C around noon, light drizzle is forecast from approximately 3 PM, transitioning to light rain after 6 PM, with a 100% chance of precipitation. Carrying full rain gear is essential for any activity today.

The afternoon precipitation will make the rocky ridges from Murodo via Ichinokoshi to the summit of Oyama wet and slippery. The risk of rockfall from Ichinokoshi may increase due to unstable wet rocks, requiring careful footing. With only 3cm of snow currently and low temperatures, the ground is expected to be wet and muddy rather than dry, with some remaining soft snow.

At an elevation of nearly 3000m, felt temperatures remain low throughout the day. When precipitation begins in the afternoon, with temperatures around 5.4°C and light winds of 0.28m/s, the risk of hypothermia increases significantly if you get wet. A wicking base layer, a fleece mid-layer, and a waterproof-breathable shell as an outer layer are crucial. Gloves and a warm hat are also necessary. While no significant thunderstorms or strong winds are forecast, temperatures will drop to around 2°C overnight, so adequate cold weather gear is paramount even for day trips.