穏やかな残雪期の一日。山頂まで慎重な足運びを

As of 7:15 AM, Mt. Tateyama summit is partly cloudy with a temperature of 4.5°C, feeling like 1.2°C. There is a clear 3.9°C temperature difference from Murodo base, indicating the significant impact of elevation. Throughout the day, expect partly cloudy skies to transition to mostly clear by midday, with rising temperatures. By noon, the summit temperature is forecast to reach 9.4°C, and even with wind gusts up to 7.6m/s, the perceived temperature will be around 8°C. Winds are generally mild and not expected to impede movement.

The 80cm snowpack is expected to soften due to daytime warming. The route from Murodo to Ichinokoshi and up to the summit of Oyama will feature a mix of thawing snow slopes and exposed rocky terrain. Particular caution is advised on the steep ascent from Ichinokoshi, where soft snow can cause slips and meltwater may dislodge rocks. Maintain careful footing and continuously assess the route conditions.

Appropriate layering is crucial, as perceived temperatures at 2993m will range from 1°C to 8°C during the day. A wicking base layer, a mid-layer like fleece or light down, and a waterproof/breathable outer shell are essential. Carry additional insulation to wear during breaks or when stationary on exposed ridges to prevent hypothermia. Microspikes or light crampons are effective on snowy sections, and waterproof hiking boots with gaiters are also necessary.

The risk of thunderstorms is low. Maximum wind gusts of 7.6m/s are not expected to hinder movement, but prolonged exposure on ridges should be avoided to manage hypothermia risk. This risk is otherwise manageable with proper gear and active temperature regulation. Clear skies are forecast for the evening, with temperatures dropping to around 0°C. Nighttime travel is not recommended.