午後は霧雨混じり。夜間の急冷に備えよ

This morning, Niseko Hirafu summit started with mostly clear skies, a temperature of 5.6℃, and a feels-like temperature of 3.3℃, indicating mild conditions. The base area is at 11.6℃. Clear weather is expected to continue through the morning, with temperatures rising to 11.9℃ during the day. Winds will remain light throughout the day, mitigating the risk of whiteout conditions on exposed ridges. Visibility is excellent, exceeding 20km, offering promising views from the main Niseko mountain range.

Light drizzle is forecast to begin around noon, with the probability of precipitation increasing to 47% by 3 PM. As there is no snow cover, the Hirafu ski slopes and surrounding forest trails will become damp, potentially turning muddy in certain areas, especially near stream beds. Extreme caution is advised for footing.

An automatic risk assessment warns of a "rapid temperature drop." Temperatures are expected to plummet from evening into night, reaching as low as -2.7℃ by early tomorrow morning. For daytime activities, essential gear includes a wicking base layer, a mid-layer such as fleece, and a waterproof outer shell. However, it is crucial to carry an extra insulating layer, like a lightweight down jacket, as a precaution. Waterproof rain gear, both top and bottom, is essential for the afternoon drizzle. To mitigate hypothermia risk, prioritize staying dry and be prepared to turn back early. Nighttime temperatures will drop below freezing, and wet ground could freeze, so avoid activity after dark.